Gotowe bibliografie tematyczne / Spray combustion environment

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Gotowa bibliografia na temat „Spray combustion environment”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Spray combustion environment"

Desantes, Jose M., Jose M. Garcia-Oliver, Ricardo Novella i Leonardo Pachano. "A numerical study of the effect of nozzle diameter on diesel combustion ignition and flame stabilization". International Journal of Engine Research 21, nr 1 (19.07.2019): 101–21. http://dx.doi.org/10.1177/1468087419864203.

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The role of nozzle diameter on diesel combustion is studied by performing computational fluid dynamics calculations of Spray A and Spray D from the Engine Combustion Network. These are well-characterized single-hole sprays in a quiescent environment chamber with thermodynamic conditions representative of modern diesel engines. First, the inert spray evolution is described with the inclusion of the concept of mixing trajectories and local residence time into the analysis. Such concepts enable the quantification of the mixing rate, showing that it decreases with the increase in nozzle diameter. In a second step, the reacting spray evolution is studied focusing on the local heat release rate distribution during the auto-ignition sequence and the quasi-steady state. The capability of a well-mixed-based and a flamelet-based combustion model to predict diesel combustion is also assessed. On one hand, results show that turbulence–chemistry interaction has a profound effect on the description of the reacting spray evolution. On the other hand, the mixing rate, characterized in terms of the local residence time, drives the main changes introduced by the increase of the nozzle diameter when comparing Spray A and Spray D.

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Jafarmadar, Samad, Shram Khalilarya, Sina Shafee i Ramin Barzegar. "Modeling the effect of spray/wall impingement on combustion process and emission of DI diesel engine". Thermal Science 13, nr 3 (2009): 23–33. http://dx.doi.org/10.2298/tsci0903023j.

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This work is presented to study the effect of spray impinging on the combustion process and emissions in a direct injection diesel engine at various engine speeds. Computations are carried out using a three-dimensional modeling for sprays, spray-wall interactions, flow field, emission, and combustion process. Results indicate an increase in engine speed leads to increased spray impinging (wall film formation), turbulence intensity and average wall temperature in cylinder. The enhanced air/fuel mixing and intensified evaporation of wall film decreases soot emission by reducing the extent of the fuel rich regions specially in impinging zones. Also at higher engine speeds, combustion is delayed and fuel is consumed in a shorter time period by the enhanced air and fuel mixing. The shorter combustion duration provides less available time for soot and NOx formations. However, only a few attempts have been made to address the effect of impingement of spray with piston walls on the emissions and combustion process. The results of model in addition to approving the corresponding data in the literature are also compared with the experimental data and shown good agreement.

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Arai, Masataka. "Interpretative Review of Diesel Spray Penetration Normalized by Length and Time of Breakup (Similarity Law of Diesel Spray and Its Application)". Energies 15, nr 13 (5.07.2022): 4926. http://dx.doi.org/10.3390/en15134926.

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Tip penetration of diesel spray is one of the most useful parameters to evaluate diesel combustion dynamics. It has strong relationships with ignition delay, premix/diffusion combustion and engine performance, including exhaust emissions. To discuss general combustion physics in various size sprays, non-dimensional expression of spray tip penetration is reviewed. Length and time of injected fuel jet breakup can be considered as characteristic length and timescale of diesel spray. Then, normalized penetration by length and time of breakup was proposed for the scaling of various diesel sprays. Using the proposed scaling method and similarity law, tip penetrations of various size sprays are collapsed into one simple expression. It becomes a base of similarity law of diesel spray. For example, local or average A/F is uniquely expressed by the normalized length and time of breakup. Penetration of a wall impingement spray is also expressed uniquely by this normalization method and physical parameters affecting the wall impingement spray are explained. Injection rate shaping effect at an initial stage of injection is clearly demonstrated by using this scaling. Further, mixing degrees of diesel spray at an ignition timing and in a combustion phase can be reasonably explained by the equivalence ratio change with non-dimensional elapsed time after injection start.

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Liu, Yu, Jun Li, Ying Gao i Xin Mei Yuan. "Laser Diagnostic Investigation on the Spray and Combustion with Butanol-Biodiesel-Diesel Fuel Blends". Advanced Materials Research 443-444 (styczeń 2012): 986–95. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.986.

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. In this paper, blends of butanol-biodiesel-diesel were tested inside a constant volume chamber to investigate liquid spray and combustion of the fuels. With high-speed camera and synchronized copper vapor laser, spray penetration during injection is recorded since it has a higher light reflectivity. Various ambient temperatures and fuel composition were investigated. There is a sudden drop in spray penetration at 800 K and 900 K, but not at 1000 K and 1200 K. When the spray penetration of the butanol-biodiesel-diesel blends is compared to that of the biodiesel-diesel blends, under non-combusting environment, a sudden drop in spray penetration length is also observed at 1100 K. High speed imaging shows that, for the non-combusting case, at 1100 K, the tip of the spray jet erupts into a plume sometime after injection for the butanol-biodiesel-diesel blend. The same is not seen with the biodiesel-diesel blend, neither at lower ambient temperature of 900 K. It is concluded that micro-explosion can occurs under particular conditions for the butanol-biodiesel-diesel blend, and the results is consistent with previous study in the literature.

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Chung, Wai Tong, Peter C. Ma i Matthias Ihme. "Examination of diesel spray combustion in supercritical ambient fluid using large-eddy simulations". International Journal of Engine Research 21, nr 1 (7.08.2019): 122–33. http://dx.doi.org/10.1177/1468087419868388.

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High-pressure conditions in diesel engines can often surpass the thermodynamic critical limit of the working fluid. Consequently, the injection of fuel at these conditions can lead to complex behaviors that remain only incompletely understood. This study is concerned with investigating the application of a diffuse-interface method in conjunction with a finite-rate chemistry model in large-eddy simulations of diesel spray injection and ignition in a supercritical ambient environment. The presented numerical approach offers the capability of simulating these complex conditions without the need for parameter tuning that is commonly employed in spray-breakup models. Numerical simulations of inert and reacting n-dodecane sprays — under the Engine Combustion Network Spray A and Spray D configurations — are studied, and results are compared with experimental data for liquid/vapor penetration lengths and ignition timing. In addition, parametric studies are performed to identify flow sensitivities arising from the variation in nozzle diameters between both injectors, along with the impact of low-temperature oxidation on ignition in Spray D simulations. Spray A simulations are found to be insensitive to turbulence, and predictions for penetration length and ignition behavior are in good agreement with experiments. In contrast, Spray D predictions for penetration length and ignition delay demonstrated significant sensitivities to in-nozzle turbulence, introducing uncertainty to the predicted results and stipulating the need for quantitative measurements for model evaluation.

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Xuan, Tiemin, Zhongcheng Sun, Peng Lu, Wenjun Zhong, Zhanbo Si, Zhixia He, Qian Wang, Zhou Chen i Wei Guan. "Optical study on needle lift and its effects on reacting diesel sprays of a single-hole solenoid injector". Thermal Science, nr 00 (2020): 289. http://dx.doi.org/10.2298/tsci190925289x.

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Precise control of needle lift provides one possibility to control the Diesel spray and combustion process actively. However, most studies of needle lift focus on internal flow or near nozzle spray. Little work has been performed on its effects on reacting spray. In this work, one way to change the needle lift profile of a solenoid injector has been developed and the relationship between needle lift and reacting spray has been investigated. The needle movement was detected with an optical nozzle. In addition, the visualization of reacting sprays of the same injector equipped with a single-hole nozzle was conducted in a combustion chamber. Some simulations were also performed to assist the analysis. The results show that the needle lift profile can be regulated by changing the thickness of an adjusting pad. It seems the different needle lift profiles do not bring in significant influences on reacting spray characteristics. The CFD results indicate that it is mainly caused by the similar internal flow characteristics which do not show strong variation when needle lift is higher than 0.1 mm. However, the discharge coefficient and velocity coefficient decrease sharply when needle lift is smaller than 0.05 mm because of the ?throttle? effect.

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Luo, Meng, Pingping Zhu, Usman Rana, Hu Ma, Zhendong Yu i Oskar J. Haidn. "Modeling Investigation of Liquid Oxygen Flashing Spray with CFD". Journal of Physics: Conference Series 2235, nr 1 (1.05.2022): 012061. http://dx.doi.org/10.1088/1742-6596/2235/1/012061.

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Abstract Injection of cryogenic propellants (e.g. liquid oxygen) into low-pressure environment (e.g. upper-stage rocket engine) may trigger flashing phenomenon, which severely affects the propellants’ mixing and combustion. In order to unveil the characteristics of flashing sprays, numerical models of flashing sprays were developed and validated. First, a developed model based on Adachi-correlation was employed for the flashing spray simulation. The results show good agreements with the experiments, both for the flashing spray morphology and temperature distribution. In the near-injector region, the flashing evaporation dominates the spray vaporization with the evaporation mass flow rate of about 2 orders of magnitude higher than that by the other heat transfers, whereas downstream the injector, the external heat transfer (i.e. heat conduction and convection) does. Furthermore, a new flashing spray model based on the nucleate boiling theory was proposed, which shows an improved agreement of the droplet temperature between the simulation and test data.

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Li, Zhijie, Jie Pan, Wei Li, Xiangting Wang, Haiqiao Wei i Jiaying Pan. "New Insights into Abnormal Combustion Phenomena Induced by Diesel Spray-Wall Impingement under Engine-Relevant Conditions". Energies 15, nr 8 (17.04.2022): 2941. http://dx.doi.org/10.3390/en15082941.

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High altitude and low temperature is the common extreme environment for internal combustion engines. Under such operating conditions, heavy-duty diesel engines often suffer from serious abnormal combustion, such as knocking combustion, which results in piston crown breakdown and cylinder head erosion. Spray-wall impingement and pool fires are considered potential causes; however, the detailed mechanism remains poorly understood owing to the lack of research data. In this study, for the first time, the destructive abnormal combustion induced by diesel spray-wall impingement was identified using an optical rapid compression machine under engine-relevant conditions at high altitudes. Combining instantaneous pressure and temperature measurements with simultaneously recorded high-speed photography gives useful insights into understanding the detailed combustion processes. The experimental results show that depending on the extent of diesel spray-wall impingement, supersonic detonation-like reaction fronts featuring bright luminosity can be observed. The propagation of these reaction fronts in-cylinder results in severe pressure oscillations with an amplitude approaching hundreds of atmospheres, which is like the super-knock events in boosted direct-injection spark-ignition engines. Further parametric analysis indicates that the interplay between the diffusion combustion controlled by diesel spray and the premixed combustion dominated by attached film evaporation results in the formation of abnormal combustion. Destructive reaction fronts tend to occur at a prolonged ignition delay time, which facilitates the mixing between diesel evaporation and hot air.

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Raghu, P., K. Thilagan, M. Thirumoorthy, Siddharth Lokachari i N. Nallusamy. "Spray Characteristics of Diesel and Biodiesel in Direct Injection Diesel Engine". Advanced Materials Research 768 (wrzesień 2013): 173–79. http://dx.doi.org/10.4028/www.scientific.net/amr.768.173.

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Alternative fuels for diesel engines are becoming important due to the decrease of petroleum reservoirs and the increase of environment pollution problems. The biodiesel is technically competitive with conventional petroleum-derived diesel fuel and requires no changes in the fuel distribution system. Injection process of biodiesel influences the atomization and dispersion of fuel in the combustion chamber. In diesel Engine different tests have been performed to improve the efficiency in cycle, power, less emission, speed, etc. There are various methods of visualizing the combustion chamber in a Diesel engine. For visualizing spray characteristics of combustion chamber in Diesel engine the window of 10mm diameter hole, transparent quartz glass materials are used, which can with-stand 1500°C temperature and pressure of about 1000 bar and engine is hand cranked for conducting the experiments. Spray characteristics of palm oil methyl ester (POME) and diesel were studied experimentally. Spray penetration and spray angle were measured in a combustion chamber of DI diesel engine by employing high definition video camera and image processing technique. The study shows the POME gives longer spray tip penetration and spray angle are smaller than those of diesel fuels. This is due to the viscosity and density of biodiesel.

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Duronio, Francesco, Angelo De De Vita, Alessandro Montanaro i Luigi Allocca. "Experimental Investigation and Numerical CFD Assessment of a Thermodynamic Breakup Model for Superheated Sprays with Injection Pressure up to 700 Bar". Fluids 8, nr 5 (14.05.2023): 155. http://dx.doi.org/10.3390/fluids8050155.

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Among the most relevant fields of research recently investigated for improving the performance of gasoline direct injection (GDI) engines, there are ultrahigh injection pressures and the flash-boiling phenomenon. Both perform relevant roles in improving the air/fuel mixing process, reducing tailpipe emissions and implementing new combustion methods. When a high-temperature fuel is released into an environment with a pressure lower than the fuel’s saturation pressure, flash boiling occurs. Due to complex two-phase flow dynamics and quick droplet vaporization, flash boiling can significantly modify spray formation. Specifically, if properly controlled, flash boiling produces important benefits for the fuel–air mixture formation, the combustion quality and, in general, for overall engine operation. Flash boiling was broadly investigated for classical injection pressure, but few works concern ultrahigh injection pressure. Here, the investigation of the spray produced by a multihole injector was performed using both experimental imaging techniques and CFD simulations aiming to highlight the combined impact of the injection pressure and the flash boiling occurrence on the spray morphology. The shadowgraph method was employed to observe the spray experimentally. The information gathered allows for assessing the performances of an Eulerian–Lagrangian algorithm purposely developed. Breakup and evaporation models, appropriate for flashing sprays, were implemented in a CFD (Computational Fluid Dynamics) code. The experimental results and the CFD simulations demonstrate a good agreement, demonstrating that through adoption of a flash-boiling breakup model, it is possible to reproduce non-evaporating and superheated sprays while changing few simulation parameters. Finally, the results also show the significance of injection pressure in preventing spray collapse.

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Rozprawy doktorskie na temat "Spray combustion environment"

Jagus, Krzysztof. "Large eddy simulation of fuel injection and spray combustion in an engine environment". Thesis, Brunel University, 2009. http://bura.brunel.ac.uk/handle/2438/4064.

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Large eddy simulation of spray combustion in an HSDI engine is carried out in this thesis. The implementation of the code was performed in logical steps that allowed both assessment of the performance of the existing KIVA-LES and later development. The analysis of the liquid annular jet confirmed existence of typical, annular jet exclusive structures like head vortices, stagnation point and recirculation in the inner zone. The influence of the swirl in the ambient domain was found to have profound impact on the development, penetration and radial spreading of the jet. Detailed results were reported in Jagus et al. (2008). The code was further validated by performing an extensive study of large eddy simulation of diesel fuel mixing in an engine environment. The reaction models were switched off in order to isolate the effects of both swirl and the different numerical treatment of LES. Reference RANS simulation was performed and significant differences were found. LES was found to capture much better the influence of the swirl on the liquid and vapour jets, a feature essentially absent in RANS results. Moreover, the predicted penetration of the liquid was much higher for the LES case and more in accordance with experimental measurements. Liquid penetration and subsequent evaporation are very important for prediction of heat release rates and encouraging results formed a good basis to performing a full simulation with models for ignition and combustion employed. The findings were analyzed in the paper by Jagus et al. (2009). Further modifications were introduced into the LES code, among them changes to the combustion model that was originally developed for RANS and calculation of the filter width. A new way of estimating the turbulent timescale (eddy turnover time) assured that the incompatibilities in the numerical treatment were eliminated and benefits of LES maximized. The new combustion model proved to give a very good agreement with experimental data, especially with regard to pressure and accumulated heat release rates. Both qualitative and quantitative results presented a significant improvement with respect to RANS results and old LES formulation. The new LES model was proved to give a very good performance on a spectrum of mesh resolutions. Encouraging results were obtained on a coarse mesh sets therefore proving that the new LES code is able to give good prediction even on mesh sizes more suitable for RANS. Overall, LES was found to be a worthy alternative to the well established RANS methods, surpassing it in many areas, such as liquid penetration prediction, temperature-turbulence coupling and prediction of volume-averaged data. It was also discovered that the improved LES code is capable of producing very good results on under-resolved mesh resolutions, a feature that is especially important in industrial applications and on serial code structure.

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Lebas, Romain. "Modélisation Eulérienne de l'Atomisation Haute Pression - Influences sur la Vaporisation et la Combustion Induite". Phd thesis, Université de Rouen, 2007. http://tel.archives-ouvertes.fr/tel-00707588.

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Les contraintes actuelles, écologiques et économiques, imposent aux constructeurs automobiles de réduire la consommation et les émissions polluantes des moteurs Diesel. Pour améliorer ces derniers, il faut comprendre finement les phénomènes physiques mis en jeu et en particulier l'injection du carburant dans la chambre de combustion. Une voie d'analyse de la physique et d'optimisation des moteurs Diesel à injection directe est la simulation numérique et plus particulièrement la modélisation. Après avoir détaillé les caractéristiques physiques des sprays, les modélisations existantes du processus d'atomisation ainsi que leurs limitations, un modèle innovant est présenté : le modèle ELSA (pour Euler - Lagrange pour les Sprays et l'Atomisation). Il prend en compte l'écoulement dans la zone dense du spray et traite le phénomène d'atomisation depuis l'intérieur de l'injecteur jusque dans la zone diluée du spray. Les équations fondamentales de ce modèle sont l'équation de transport de la fraction massique moyenne de liquide et l'équation de transport de la densité massique moyenne d'interface liquide/gaz. Dans ces deux équations apparaît un terme de flux turbulent non fermé. Une méthode de couplage des formalismes eulérien et lagrangien est proposée pour sa fermeture. De plus, en prenant en compte chacun des phénomènes physiques agissant sur la quantité d'aire interfaciale liquide/gaz, des évolutions sur la fermeture de cette équation de transport sont apportées. Enfin, les échanges thermique et massique entre les phases liquide et gaz sont intégrés au modèle ELSA à l'aide de deux équations de transport : une pour la fraction massique de vapeur et une pour l'enthalpie massique de la phase liquide. Des cas de validations sont présentés, concernant tout d'abord une étude comparative en zone dense du jet avec des données issues d'une simulation numérique directe puis à l'aide de données expérimentales macroscopiques comme les pénétrations liquide et vapeur pour un spray vaporisant ou le positionnement de flamme dans le cas d'une combustion diphasique en régime stationnaire.

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Librovich, Bronislav. "Modelling of group combustion of droplets in a spray fuel cloud". Thesis, University of Central Lancashire, 1999. http://clok.uclan.ac.uk/19287/.

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Release and combustion of a spray cloud in an atmosphere is a phenomenon encountered in a wide range of applications. For solution of a set of problems which is connected with ecology, theory of combustion and explosion, engine design, fire safety, etc. the knowledge of spray combustion behaviour is required. To investigate the influence of a variety in density and transport coefficients and flame front structure, combustion of pure gas cloud is studied numerically. Combustion of a small-scale spherical pocket of fuel droplets in a calm environment may be considered as a model enabling the transient combustion process to be studied conveniently in one-dimensional geometry. Apart from pure academic interest, such a study provides useful estimations of burning spray cloud characteristics which can be applied for the analysis of more complicated situations. An analytical approach is used to find quasi-steady state distributions of gas temperature and fuel mass fraction for both pure evaporating and burning clouds. This approach is quite fruitful, it gives important qualitative analytical relationships, which help to comprehend the complex process of evaporation or combustion of spray the cloud. Numerical method is used to solve the problem of spray cloud combustion using more common unsteady statement. Two types of ignition are used at the centre or from penphery of cloud. Two types of flames (premixed and diffusion flames) are observed in the numerical simulations. Distributions of all components and temperature are obtained at different moments of time for both types of ignition. The diffusion burning time and total evaporation time are estimated using numerical results.

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Li, Yanfei. "Experimental study on spray and combustion characteristics of diesel-like fuels". Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3428/.

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With increasing concern on the dwindling of the fossil fuel reserve and climate change, more and more effort has been focused on seeking green fuel to replace fossil fuel and mitigating the emissions of greenhouse gas (GHG). Biodiesel has attracted much attention for its sustainability, lower emissions of HC, PM and CO, and the diverse feedstock. In this study, diesel/diesel-like fuels were experimentally studied in terms of spray and combustion characteristics.

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Sunil, Sanadi Dilip. "Dynamics of Hollow Cone Spray in an Unconfined, Isothermal, Co-Annular Swirling Jet Environment". Thesis, 2015. http://etd.iisc.ernet.in/2005/3866.

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The complex multiphase flow physics of spray-swirl interaction in both reacting and non-reacting environment is of fundamental and applied significance for a wide variety of applications ranging from gas turbine combustors to pharmaceutical drug nebulizers. Understanding the intricate dynamics between this two phase flow field is pivotal for enhancing mixing characteristics, reducing pollutant emissions and increasing the combustion efficiency in next generation combustors. The present work experimentally investigates the near and far-field break-up, dispersion and coalescence characteristics of a hollow cone spray in an unconfined, co¬annular isothermal swirling air jet environment. The experiments were conducted using an axial-flow hollow cone spray nozzle having a 0.5 mm orifice. Nozzle injection pressure (PN = 1 bar) corresponding to a Reynolds number at nozzle exit ReN = 7900 used as the test setting. At this setting, the operating Reynolds number of the co-annular swirling air stream number (Res) was varied in four distinct steps, i.e. Res = 1600, 3200, 4800 and 5600. Swirl was imparted to the co¬axial flow using a guided vane swirler with blade angle of Ф=45° (corresponding geometric swirl number SG = 0.8). Two types of laser diagnostic techniques were utilized: Particle / Droplet imaging analysis (PDIA) and shadowgraph to study the underlying physical mechanisms involved in the primary breakup, dispersion and coalescence dynamics of the spray. Measurements were made in the spray in both axial and radial directions and they indicate that Sauter Mean Diameter (SMD) in radial direction is highly reliant on the intensity of swirl imparted to the spray. The spray is subdivided into two zones as function of swirl in axial and radial direction: (1) near field of the nozzle (ligament regime) where variation in SMD arises predominantly due to primary breakup of liquid films (2) far-field of the nozzle where dispersion and collision induced coalescence of droplets is dominant. Each regime has been analyzed meticulously, by computing probability of primary break-up, probability of coalescence and spatio-temporal distribution of droplets which gives probabilistic estimate of aforementioned governing phenomena. In addition to this, spray global length scale parameters such as spray cone angle, break-up length, wavelength of liquid film has been characterized by varying Res while maintaining constant ReN.

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Chang, Shiu-Shing, i 張士勳. "Steady and Non-steady Combustion of Droplet and Fuel Sprays in High Temperatur Environment". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/16682439612059439276.

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博士
國立成功大學
航空太空工程學系
84
TITLE: Steady and Nonsteady Combustion of Droplet and Fuel Sprays in High Temperature Environment. The droplet, either stationary or convective, under the radiative environment is studied. A new conceptual and theoretical approach,"Potential Theory of Radiation", is proposed and used to predict the radiative flux in the gas flow outside the droplet. Close results are found by comparing withthe conventional method. It is found thatdroplet gasification rate decreasesslightly in a weak radiative environment, whereas increases in a medium to strong radiative environment. A radiation modulated droplet gasification law isobtained from the numerical results of a convecting droplet with radiation. The thesis further investigates an airbreathing combustor with radiation participated in the gas flow. Various droplet laws are applied to predict the droplet gasification rate in a spray. It is found that radiation plays a minor part for the present configuration and operation conditions. However, the renormalized droplet law, which accounts forthe drop-drop interaction predicts significantly lower combustion efficiency and different flow structure. Also, four spraystructures are identified according to their main combustion zone positions.An application with the pulse injection of fuel is also investigated. It is found that the total gasification rate increases suddenly at the startup of ignition, and this is a potential cause of engine blow up.

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Części książek na temat "Spray combustion environment"

Lee, Seong-Young, Ahmed Abdul Moiz i Khanh D. Cung. "Turbulent Spray Combustion". W Energy, Environment, and Sustainability, 277–312. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7449-3_11.

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Sonawane, Utkarsha, i Avinash Kumar Agarwal. "Spray Breakup Modelling for Internal Combustion Engines". W Energy, Environment, and Sustainability, 57–85. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-8618-4_4.

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Hampartsoumian, E., W. Nimmo, M. Pourkashanian, A. Williams i M. Missaghi. "The Prediction of NOx Emissions from Spray Combustion". W Combustion Technologies for a Clean Environment, 237–56. London: CRC Press, 2022. http://dx.doi.org/10.1201/9780367810597-19.

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Hwang, Joonsik, Felix Sebastian Hirner, Choongsik Bae, Chetankumar Patel, Tarun Gupta i Avinash Kumar Agarwal. "Image-Based Flame Temperature and Soot Analysis of Biofuel Spray Combustion". W Energy, Environment, and Sustainability, 41–54. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3299-9_3.

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Kundu, Prithwish, Muhsin M. Ameen i Sibendu Som. "Recent Progress in Turbulent Combustion Modeling of Spray Flames Using Flamelet Models". W Energy, Environment, and Sustainability, 477–512. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7410-3_16.

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Kale, Rakesh, i R. Banerjee. "Spray Collapse in a Multi-hole GDI Injector and Its Effect on In-Cylinder Combustion". W Energy, Environment, and Sustainability, 43–61. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3256-2_3.

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Ashirbad, Aaishi, Dhananjay Kumar i Avinash Kumar Agarwal. "Feasibility Study of Laser Plasma-Assisted Stratified Combustion and Spray Investigations in a Constant Volume Chamber". W Energy, Environment, and Sustainability, 289–315. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1392-3_11.

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Ghaffar, Zulkifli Abdul, Salmiah Kasolang i Ahmad Hussein Abdul Hamid. "Jet-Swirl Injector Spray Characteristics in Combustion Waste of a Liquid Propellant Rocket Thrust Chamber". W Engineering and Technical Development for a Sustainable Environment, 185–98. Oakville, ON, Canada ; Waretown, NJ, USA : Apple Academic Press, [2017]: Apple Academic Press, 2017. http://dx.doi.org/10.1201/9781315207322-13.

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Basu, Saptarshi, Avinash Kumar Agarwal, Achintya Mukhopadhyay i Chetankumar Patel. "Introduction to Droplets and Sprays: Applications for Combustion and Propulsion". W Energy, Environment, and Sustainability, 3–6. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7449-3_1.

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Streszczenia konferencji na temat "Spray combustion environment"

Kwon, Y. D., Y. W. Moon, Y. M. Kim i S. W. Kim. "Combustion Characteristics of Diesel Spray in High-Pressure Environment". W ICLASS 97. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/iclass-97.1370.

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Chiu, H. H. "Progress and Challenges in Droplets and Spray Combustion". W ASME 1997 Turbo Asia Conference. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-aa-071.

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Recent theoretical developments in droplet and spray combustion have been reviewed with due emphasis placed upon the modern interpretation of phenomena and the elucidation of unified theoretical approaches and the foundation of concepts in the area of selected outstanding problems previously identified. Universal laws of a droplet for a dilute and a non-dilute spray, developed recently by the techniques of canonical integration and renormalizaton, offer remarkably broad based knowledge and quantitative prediction of droplet exchange rates in a general hydrodynamic environment. The phenomena and criteria of state transition and the principles of partition of gasification among all the major subprocesses at the transition state are presented. Also reviewed is the multi-state behavior of an isolated converting droplet in the critical ranges of Reynolds number and Damkohler number. Recent experimental validations of group combustion phenomena in laminar sprays and turbulent premixed sprays are presented and the concept of hierarchical group combustion in practical liquid sprays are discussed. Emerging interest in the large scale structures, featured by inhomogeneous local clustering and declustering of droplets in liquid sprays are presented. Various mechanisms of the formation of complex configurations of structures are identified and theoretical categorization based on hierarchical distribution functions are proposed. Kinetic theoretic approach of many-droplet system based on Born, Bogoliuvob, Green Kirkwood, and Yvon’s hierarchy is extended for the classification of structural configuration and the predictions of the dynamic evolution as well as the exchange of scalar and vectorial properties are discussed.

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Shahangian, Navid, Damon Honnery i Jamil Ghojel. "Homogenisation of High Pressure Diesel Fuel Spray Combustion Using Porous Ceramic Media". W ASME 2012 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icef2012-92143.

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Interest is growing in the benefits of homogeneous charge compression ignition engines. In this paper we investigate a novel approach to the development of a homogenous charge like environment through the use of porous media. The primary purpose of the media is to enhance the spread of the high pressure fuel spray. In this paper we show through high speed visualizations of both cold and hot spray events, how porous media interactions can give rise to greater fuel air mixing and what role system pressure plays in further enhancing this process.

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Kim, Y. M., Y. D. Kwon, H. J. Kim i S. W. Kim. "Numerical Study on Ignition and Combustion Process of a Diesel Spray in EGR Environment". W International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1996. http://dx.doi.org/10.4271/960874.

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Godbold, Conner, Farzad Poursadegh, Oleksandr Bibik, Carlos De La Camara Castillo i Caroline Genzale. "A Multi-Wavelength Extinction Imaging Diagnostic for Quantifying Diesel Spray Mixing at Engine-Relevant Conditions". W ASME 2020 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icef2020-2972.

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Abstract The mixing of fuel and air in the combustion chamber of an IC engine is crucial to emissions formation. Therefore, developing effective diagnostic techniques for measuring mixing is critical for progressing IC engines. Existing methodologies for the optical measurement of air-fuel mixing, including Rayleigh scattering and Laser Induced Fluorescence (LIF), have demonstrated various diagnostic-implementation challenges, high uncertainties under engine-relevant environments, and strong interferences from the liquid spray which prevents their use in near-spray measurements. This work presents the use of an alternative approach based on a laser-absorption/scattering technique called Ultraviolet-Visible Diffuse Back-Illumination (UV-Vis DBI) to quantify local equivalence ratio in a vaporizing diesel spray. Ultraviolet and visible light are generated using a ND:YAG pumped frequency-doubled tunable dye laser operating at 9.9 kHz. The simultaneous UV-Visible illumination is used to back-illuminate a vaporizing diesel spray, and the resulting extinction of each signal is recorded by a pair of high-speed cameras. Using an aromatic tracer (naphthalene, BP = 218 °C) in a base fuel of dodecane (BP = 215–217 °C), the UV illumination (280 nm) is absorbed along the illumination path through the spray, yielding a projected image of line-of-sight optical depth that is proportional to the path-average fuel vapor concentration in the vapor region of the spray. The visible illumination is chosen at a non-absorbing wavelength (560 nm), such that the light extinction is only due to liquid scattering, yielding a projected image of the liquid spray. A key advantage of the method is that the absorption coefficient of the selected tracer is relatively independent of temperature and pressure for 280-nm illumination, reducing measurement uncertainties at engine-relevant conditions. Measurements are also achievable in near-spray vapor regions since there is no mie-scattering interference from the liquid spray. The diagnostic is applied to measure the fuel-air mixing field of a diesel spray produced by a Bosch CRI3-20 ks1.5 single-orifice injector (90 μm diameter) similar to ECN Spray A. Measurements are conducted in a non-reacting high-pressure and temperature nitrogen environment using a constant-flow, optically-accessible spray chamber operating at 60 bar and 900 K. The results are evaluated against existing ECN mixing measurements based on Rayleigh scattering. The diagnostic yields centerline and radial mixture fraction measurements that match the ECN Rayleigh measurements within uncertainty bounds.

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Grimenstein, L. F. "Plasma Quality at Combustion Price". W ITSC2004, redaktorzy Basil R. Marple i Christian Moreau. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.itsc2004p0456.

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Abstract The Hitachi MaxJet II is a unique multi-purpose combustion gun. It can be used for spraying wire but it also has the capability to spray multiple materials via-powder and powder cord form. The equipment operates using commonly available gases: compressed air, Oxygen and Propane or Mapp gas. It requires no major facility cost since it uses only a 35 cfm air compressor and 115 volt power supply. Safety is assured with a safety purge system, separation of electrical and gases systems and flash back arresters. The small compact system weighs less than two hundred pounds, which makes it easily movable for on site work. It’s low capital investment and high quality coatings with low porosity and excellent bond strengths. The electronic pusher type wire feed provides consistent feed rates for a large variety of wires and wire sizes (1/16”, 1/8”, and 3/16”). The spray gun weighs only three pounds and can be mounted on a robot or used for hand spray applications. It functions well in a shop environment or onsite spraying of bridge components.

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Godbold, Conner, Farzad Poursadegh, Oleksandr Bibik i Caroline Genzale. "Measurement of Air-Fuel Mixing in a Diesel Spray at Engine Relevant Conditions Using UV-VIS DBI Diagnostic". W ASME 2021 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icef2021-68205.

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Abstract Due to the non-premixed nature of diesel combustion, mixing prior to the reaction zone has proven to be one of the primary factors in emissions formation. Therefore, the advancement of diagnostics used to measure mixing fields in diesel applications is imperative for a greater understanding of how in-cylinder emissions mitigation techniques operate. Towards this goal, we have recently demonstrated the use of a high-speed two-wavelength extinction imaging measurement, UV-VIS DBI, for time-resolved measurements of mixing in a diesel spray. This diagnostic operates by back-lighting the spray with ultra-violet and visible illumination. The visible illumination is selected at a non-absorbing wavelength, such that the visible light is only attenuated by liquid droplet scattering, enabling discrete detection of the liquid-vapor mixture and pure vapor phases of the spray. For this work, Ultraviolet and visible light are generated using a ND:YAG pumped frequency-doubled tunable dye laser operating at 9.9 kHz . The simultaneous UV-Visible illumination is used to back-illuminate a vaporizing diesel spray, and the resulting extinction of each signal is recorded by a pair of high-speed cameras. Using an aromatic tracer (naphthalene, BP = 218 °C) in a base fuel of dodecane (BP = 215–217 °C), the UV illumination (280 nm) is absorbed along the illumination path through the spray, yielding a projected image of line-of-sight optical depth that is proportional to the projected fuel vapor concentration in the pure vapor region of the spray. In this paper, a new method of determining the absorption coefficient for the pure-vapor phase of the spray will be discussed, along with showing how an Inverse-Abel transform can be used to compute planar concentration data from the projected concentration data yielded by the diagnostic. This diagnostic and data processing is applied to diesel sprays from two Bosch CRI3-20 ks1.5 single-orifice injectors (140 μm and 90 μm orifice diameters) injecting into a nonreacting high-pressure and temperature nitrogen environment using a constant-flow, optically-accessible spray chamber operating at 60 bar and 900 K. The mixing data produced agrees well with previously existing mixing data, which further instills confidence in the diagnostic, and gives the diesel combustion community access to mixing field data for a 140 μm orifice diameter injector at a 60 bar and 900 K condition.

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Castro, R. G., R. U. Vaidya, A. Ayala, B. D. Bartram, D. E. Gallegos i H. S. Kurek. "Evaluation of Molybdenum-Based Silicides in a Combustion and Endothermic Environment". W ITSC 1999, redaktorzy E. Lugscheider i P. A. Kammer. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 1999. http://dx.doi.org/10.31399/asm.cp.itsc1999p0020.

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Abstract This paper investigates the stability of molybdenum base silicides, which are located in combustion chambers and in an endothermic environment, for use in radiant tubes for heat treatment. The subject matter was plasma-sprayed molybdenum disilicide, pentamolybdenum trisilicide, hot-pressed molybdenum disilicide, and molybdenum disilicide composites containing SiC and silicon nitride reinforcements. Results of the investigation show that the oxidation resistance of plasma sprayed molybdenum disilicide can be detrimentally effected due to the silicon loss that occurs during the high temperature plasma spray process. Paper includes a German-language abstract.

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Kandlakunta, Sahithi, i Mahesh Panchagnula. "Laser Induced Fluorometry and Velocimetry". W ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14980.

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The characteristics of fuel atomizers have been studied by using a fluorescence optical patternator via establishing a laser sheet illumination of the spray and an image capturing system. Line laser Mie-scattering and fluorescence imaging technique is used to study the fuel mass distribution, geometrical properties, angle and symmetry in sprays. The proposed experimental setup employs Rhodamine 6G as the fluorophore. A set of filters have been used to reduce the signature from the combustion fire while being able to image the nanoparticles. Experimental results are obtained under the conditions of the fuel with and without being seeded with quantum dots and under both non-combusting and combusting spray conditions. The results from the study are validated against existing volume flux distribution measurements by conventional techniques. Owing to the high luminescence properties of quantum dots, the liquid volume distribution can accurately be determined in an evaporating as well as a non-evaporating spray using this technique. Quantum dots are semiconductor nanoparticles whose emission wavelength can be tuned by the choice of their size. Also their, high luminescence properties are advantageous in a spectrally "noisy" combustion environment.

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Winter, Michael. "In-Flight Laser Induced Fluorescence from Microgravity Droplet Combustion". W Laser Applications to Chemical and Environmental Analysis. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/lacea.1996.lthc.6.

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Most propulsion and energy utilization devices rely on the spraying of liquid-phase propellants, in the form of fuel or oxidizer, into an energy conversion chamber. The behavior of individual droplets in a spray combustor is a critical part of the combustion process. Basic understanding is best advanced by well-controlled experiments and simplified calculations. A great deal of attention has been paid to studying the combustion of individual droplets, which is the simplest example of non-premixed combustion. These single-droplet flames provide an idealized geometry for investigating the interaction of the physical and chemical processes involved. A significant means of simplifying droplet combustion is to approach the phenomena in a microgravity environment.

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Raporty organizacyjne na temat "Spray combustion environment"

Hamins, Anthony, Alexander Maranghides i George Mulholland. The global combustion behavior of 1 MW to 3 MW hydrocarbon spray fires burning in an open environment. Gaithersburg, MD: National Institute of Standards and Technology, 2003. http://dx.doi.org/10.6028/nist.ir.7013.

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Levin, B. F., J. N. DuPont i A. R. Marder. Cermet composite thermal spray coatings for erosion and corrosion protection in combustion environment. Semi-annual report, August 14, 1996--January 14, 1997. Office of Scientific and Technical Information (OSTI), luty 1997. http://dx.doi.org/10.2172/492379.

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Levin, B. F., J. N. DuPont i A. R. Marder. Cermet composite thermal spray coatings for erosion and corrosion protection in combustion environments of advanced coal-fired boilers. Office of Scientific and Technical Information (OSTI), maj 1996. http://dx.doi.org/10.2172/390522.

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Schorr, B. S., B. F. Levin, J. N. DuPont i A. R. Marder. Cermet composite thermal spray coatings for erosion and corrosion protection in combustion environments of advanced coal-fired boilers. Semiannual technical report, January 14, 1997--August 14, 1997. Office of Scientific and Technical Information (OSTI), sierpień 1997. http://dx.doi.org/10.2172/574257.

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Banovic, S. W., B. F. Levin, J. N. DuPont i A. R. Marder. Cermet composite thermal spray coatings for erosion and corrosion protection in combustion environments of advanced coal-fired boilers. Semi-annual technical progress report, February 1996--July 1996. Office of Scientific and Technical Information (OSTI), sierpień 1996. http://dx.doi.org/10.2172/415365.

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Levin, B. F., J. N. DuPont i A. R. Marder. Cermet composite thermal spray coatings for erosion and corrosion protection in combustion environments of advanced coal-fired boilers. Semiannual technical progress report, August 14, 1996--January 14, 1997. Office of Scientific and Technical Information (OSTI), luty 1997. http://dx.doi.org/10.2172/481934.

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