Готові списки джерел за темами / Supercritical nitrogen jet

Добірка наукової літератури з теми "Supercritical nitrogen jet"

Автор: Grafiati
Опубліковано: 23 вересня 2022
Оновлено: 27 січня 2023

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Статті в журналах з теми "Supercritical nitrogen jet"

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Fu, Qingfei, Yunxiao Zhang, Chaojie Mo, and Lijun Yang. "Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions." Applied Sciences 8, no. 10 (September 20, 2018): 1714. http://dx.doi.org/10.3390/app8101714.

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Анотація:
This paper investigates the characteristics of a nitrogen jet (the thermodynamic conditions ranging from subcritical to supercritical) ejected into a supercritical nitrogen environment using the molecular dynamics (MD) simulation method. The thermodynamic properties of nitrogen obtained by molecular dynamics show good agreement with the Soave-Redlich-Kwong (SRK) equation of state (EOS). The agreement provides validation for this nitrogen molecular model. The molecular dynamics simulation of homogeneous nitrogen spray is carried out in different thermodynamic conditions from subcritical to supercritical, and a spatio-temporal evolution of the nitrogen spray is obtained. The interface of the nitrogen spray is determined at the point where the concentration of ejected fluid component reaches 50%, since the supercritical jet has no obvious vapor-liquid interface. A stability analysis of the transcritical jets shows that the disturbance growth rate of the shear layer coincides very well with the classical theoretical result at subcritical region. In the supercritical region, however, the growth rate obtained by molecular dynamics deviates from the theoretical result.
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2

ANTUNES, Eduardo, Andre SILVA, and Jorge BARATA. "Modelling of transcritical and supercritical nitrogen jets." Combustion Engines 169, no. 2 (May 1, 2017): 125–32. http://dx.doi.org/10.19206/ce-2017-222.

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Анотація:
The present paper addresses the modelling of fuel injection at conditions of high pressure and temperature which occur in a variety of internal combustion engines such as liquid fuel rocket engines, gas turbines, and modern diesel engines. For this investigation a cryogenic nitrogen jet ranging from transcritical to supercritical conditions injected into a chamber at supercritical conditions was modelled. Previously a variable density approach, originally conceived for gaseous turbulent isothermal jets, imploying the Favre averaged Navier-Stokes equations together with a “k-ε” turbulence model, and using Amagats law for the determination of density was applied. This approach allows a good agreement with experiments mainly at supercritical injection conditions. However, some departure from experimental data was found at transcritical injection conditions. The present approach adds real fluid thermodynamics to the previous approach, and the effects of heat transfer. The results still show some disagreement at supercritical conditions mainly in the determination of the potential core length but significantly improve the prediction of the jet spreading angle at transcritical injection conditions.
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Fu, Qingfei, Zixuan Fang, Yunxiao Zhang, and Lijun Yang. "Molecular Dynamics Simulation of a Jet in a Binary System at Supercritical Environment." Molecules 24, no. 1 (December 21, 2018): 31. http://dx.doi.org/10.3390/molecules24010031.

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Анотація:
With the development of large-thrust liquid rocket engines, the behavior of liquid in supercritical conditions arouses increasing public interest. Due to the high pressure and temperature of the combustion chamber, fuel reaches its critical point much more easily, and enters supercritical conditions. Due to the drastic changes in the physical properties of the fluid near the critical point, it is usually difficult to simulate the fluid motion using traditional computational fluid dynamic methods; but molecular dynamics (MD) can simulate fluid motion at the molecular level. In view of the engineering application, the physical properties of a binary system consisting of argon and nitrogen, and the stability of subcritical jets sprayed into supercritical environment, has been studied here using the MD method. First, the molecular dynamic simulation of the equation of state (EOS) of the mixture was put forward. Four conditions, with different mixing ratios of nitrogen, were designed. The results showed that the mixing ratio of nitrogen noticeably affected the results; these results were compared with the Soave-Redich-Kwong (SRK) EOS. Second, a simulation was conducted of subcritical nitrogen jet sprayed into a supercritical argon environment. After analyzing the results, the jet density and temperature distributions were obtained and the disturbance growth rate of the shear layer was analyzed.
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4

Oschwald, M., and A. Schik. "Supercritical nitrogen free jet investigated by spontaneous Raman scattering." Experiments in Fluids 27, no. 6 (November 4, 1999): 497–506. http://dx.doi.org/10.1007/s003480050374.

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5

Hajji, Yassine, Denis Entemeyer, Jérôme Serri, Mustapha Yahiaoui, Abdel Tazibt, and Thierry Grosdidier. "High Pressure Cryogenic Nitrogen Jet for Clean Coating Removal: Experimental Study of Polyamide Ablation." Materials Science Forum 941 (December 2018): 1651–55. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1651.

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Анотація:
The potential of a recently developed technique that uses a clean supercritical High Pressure Cryogenic Nitrogen Jet (HPCryoN2Jet) for surface ablation and cleaning is depicted. In contrast to existent coating-removal techniques (chemical stripping, hydro-blast, water jet cleaning...), as nitrogen is naturally recycled in the air, this process has a high potential for surface treatment without any chemical and physical effluents or sewage disposal. The treatment consists in impacting the surface with a high pressure (up to 3500 bar) cryogenic nitrogen jet (down to-160°C). The pressurized cryogenic nitrogen exits from a nozzle - having generally a 0.2 to 0.5 mm diameter outlet - to form the high velocity (supersonic) nitrogen jet. In this contribution, the ability of the process to remove polymeric (PA) coatings is evaluated on different types of metallic substrates (Cu, Al, E24, 316L stainless steel). The mechanisms of chip formation have been visualized using a high speed camera. Coating failure is shown experimentally to occur downstream of the jet and the influence of the substrate thermal properties on the stripping efficiency of the PA coating is highlighted.
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Wu, Wei, Wenzhi Dong, Wenjin Qin, Meng Yue, and Maozhao Xie. "Numerical study on the mixing characteristics under transcritical and supercritical injection using large eddy simulation." Thermal Science, no. 00 (2021): 136. http://dx.doi.org/10.2298/tsci200625136w.

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Анотація:
Large eddy simulations of cryogenic nitrogen injection are performed on both transcritical and supercritical injection and mainly attentions are focus on the jet disintegration mechanism and mixing layer feature. The simulation results reveal that the thermal disintegration mechanical dominates the disintegration characteristic under supercritical conditions. The jet disintegration is delayed and longer dense core region is detected for the transcritical injection due to the large density gradient effects. Because of this disintegration mechanism, the Reynolds stresses in the transcritical case are significantly suppressed in the turbulent fluctuation. In addition, we define a mixing layer based on the density gradient and thicker mixing layer interfaces are formed in the supercritical case. The relationship between transport properties and the large density gradient are also investigated, results indicate that the large density gradients are influenced by the pseudo critical temperature and transport properties.
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Lee, Hyunchang, Haisol Kim, Seongho Cho, Hong-Gye Sung, and Youngbin Yoon. "Temperature Distribution of Liquid Nitrogen Jet at Sub- and Supercritical States." Journal of the Korean Society of Propulsion Engineers 22, no. 1 (February 1, 2018): 1–6. http://dx.doi.org/10.6108/kspe.2018.22.1.001.

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Tazibt, Abdel, Guillaume Ezo'o, Yosri Khalsi, and Mustapha Yahiaoui. "Dry Surface Preparation Using Supercritical Cryogenic Nitrogen Jet Improves the Adhesion Strength of Cold Gas Sprayed Coatings (SCNCS)." Materials Science Forum 941 (December 2018): 1668–73. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1668.

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Анотація:
The adhesion performance of Cold Sprayed coatings depends on the quality of the substrate [1,2,4,8]. Before deposition, the surface of substrate must be prepared to a specific required quality, which promotes the anchoring of sprayed coating. Grit Blasting (Samson et al.) [1] is known as the conventional surface preparation before Cold Spraying. But such method causes issues: a) shallow roughness, which does not strengthen bonds between layer and substrate; b) embedment of particles in the substrate, which creates discontinuity of the material at the interface and causes cracks that degrade the layer. Recently, Laser [2] and Pulsed Water Jet (PWJ) [1] have been tested as substrate preparation methods. These methods have shown their ability to generate improved roughness without particle embedment. PWJ has particularly shown interest in Al substrate to generate crevices, which are anchors for the Cold Sprayed coatings. Nevertheless, Laser affects thermally the substrate and induces constraints that may disadvantage the coating quality. PWJ generates liquid effluents. Besides some substrates such as ferrous metals can react with oxygen of water leading to corrosion and coating adhesion weakness.
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Golański, Grzegorz, Joanna Kępa, Paweł Wieczorek, and Krystian Prusik. "Characterization of Precipitation Process in T24 Steel after Long–Term Ageing." Solid State Phenomena 186 (March 2012): 296–300. http://dx.doi.org/10.4028/www.scientific.net/ssp.186.296.

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The T24 steel belongs to a new group of bainitic steels introduced currently to the power industry. Higher requirements connected with applying higher steam parameters in power units are the reason why the low-alloy steels used so far can no longer be applied. Therefore, new T24 steel has been developed in Europe on the basis of 10CrMo9-10 (10H2M) steel, which has been used in the power industry for many years, as a result of modification in its chemical composition. This modification consisted in introducing additions and microadditions of titanium, vanadium, boron and nitrogen into the base steel. As a result of the modification the new-found T24 steel is characterized by higher mechanical properties in comparison with the base steel, which allows to use the steel for tight shields in the new supercritical power units. The material for research was low-alloy bainitic T24 steel. Samples for examination were taken from a pipe section of the following size: outside diameter 44.5mm, wall thickness 7mm. Samples were isothermally aged in the air atmosphere, at the temperature of 580°C and at times up to 12 000 hours. Changes in the microstructure were observed and recorded by means of high-resolution electron microscope, JOEL JEM 3010. Identification of the precipitates was made using carbon extraction replicas and thin foils with the SAED method. The aim of research was the analysis of precipitation processes. They are extremely important in the context of long-term service and maintaining strength parameters above the minimum level. The tests were performed on T24 steel for the as-received condition (after heat treatment) and after 12 000 hours of ageing at the temperature of 580°C. The research made it possible to determine the morphology of precipitates. It also allowed to establish the sequence of precipitation process for the examined steel.
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Rachedi, R. R., L. C. Crook, and P. E. Sojka. "An Experimental Study of Swirling Supercritical Hydrocarbon Fuel Jets." Journal of Engineering for Gas Turbines and Power 132, no. 8 (May 18, 2010). http://dx.doi.org/10.1115/1.3124668.

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Анотація:
An experimental investigation was conducted to examine the behavior of swirling supercritical hydrocarbon fuel (SCF) jets injected into nitrogen environments whose temperatures and pressures exceeded the fuel critical values. Measurements of jet full-cone angle, mass concentration field, and penetration length were made using a schlieren system; the images were captured by a high-speed digital camera and processed using the camera’s software, plus MATLAB codes. Test parameters were the internal geometry of the pressure-swirl nozzle, fuel flow rate, and density ratio. The density ratio was varied by altering the reduced temperature of the injected fluid and nitrogen environment. SCF injections were studied at reduced temperatures (Tjet/Tcrit with both reported in Kelvin) ranging between 1.01 and 1.10, a reduced pressure (pjet/pcrit with both reported in bars) of 1.05, and fuel flowrates of 1.0 g/s, 2.0 g/s, and 3.0 g/s. The variable internal geometry pressure-swirl atomizer produced jets having swirl numbers (SN) of 0 (straight bore), 0.25, 0.50, and 1.00 (high swirl). As expected, increasing the swirl number for a SCF jet had by far the largest effect on jet cone angle, followed by a change in the density ratio; changing the fuel flow rate had very little effect. The SCF jet penetration length increased when either the fuel flow rate or density ratio increased. The mass concentration profiles demonstrated the jets to be self-similar in nature, and correlation to a Gaussian profile showed the mass concentration field to be independent of swirl number, density ratio, and fuel flow rate. Finally, it was found that there was a linear relationship between the jet half-width and the swirl number. The current study characterized the behavior of swirling hydrocarbon fuel SCF jets for the first time. Aspects of jet behavior similar to that of gas jets include: Gaussian mass concentration profiles and jet boundaries that scale with swirl number. Finally, CO2 was found to be a suitable surrogate fluid for hydrocarbon fuels since the behavior of the hydrocarbon SCF jets was similar to that of CO2 SCF jets.
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Дисертації з теми "Supercritical nitrogen jet"

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Khalsi, Yosri. "Traitement de surface par jet d'azote supercritique : application aux textiles biomédicaux." Thesis, Mulhouse, 2020. http://www.theses.fr/2020MULH2591.

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Les implants cardio-vasculaires sont de plus en plus utilisés pour la réparation des pathologies vasculaires. Près de 300 000 remplacement de valve cardiaque sont réalisés par an à travers le monde. Le développement de ces implants est désormais primordial. L’objectif de ce travail de recherche est de développer des matériaux bio-textiles performants pouvant être utilisés comme implants médicaux par l’amélioration de leur bio intégration dans le milieu biologique. En effet, suite aux études in vivo menées au LPMT, des fibroblastes prolifèrent sur la surface des implants suite à une réaction inflammatoire. Ces dernières, lorsqu’elles se fixent en grandes quantités sont à l’origine du dysfonctionnement de la valve cardiaque en textile. L’état de l’art met en évidence la sensibilité de ces cellules à la topographie. De ce fait, le traitement consiste à modifier la topographie du tissu par la projection de micro particules en surface. Cette technique a été développée par le CRITT TJFU. Le travail de recherche porte sur : i) l’étude élémentaire de l’interaction du jet d’azote supercritique avec la surface d’un polymère, ii) l’étude de l’évolution des caractéristiques physiques : vitesse de particules, température du jet en fonction des conditions du tir et iii) l’étude de l’interaction du jet avec un textile. Ainsi, sous des conditions particulières de traitement, les textiles ont subi une modification de surface à l’échelle des fils. Cette modification est caractérisée par la présence des cratères d’impact et des effilochages. Cette topographie s’avère très intéressante pour limiter les fibroblastes dans le cas de tissu monofilament et pour limiter la réaction inflammatoire sur le tissu multifilament
Cardiovascular implants are increasingly used for the repair of vascular pathologies. Almost 300,000 heart valve replacements per year are performed around the world. Nowadays, the development of these implants become crucial. The objective of this research work is to develop high-performance bio-textile materials that can be used as medical implants by improving their bio-integration into the biological environment. In fact, following in vivo studies carried out at LPMT, fibroblasts proliferate on the surface of implants following an inflammatory reaction. When these cells proliferate in large quantities, they form a biological tissue that cause the dysfunction of the textile heart valve. Bibliographic studies demonstrate the sensitivity of these cells to topography. Therefore, the treatment consists in modifying the topography of the tissue by the projection of micro particles on the surface. This technique was developed by CRITT TJFU. This research work focuses on: i) the elementary study of the supercritical nitrogen jet interaction with the polymer surface, ii) the study of the physical characteristics evolution: particle speed, temperature of the jet as well as iii) the study of the jet interaction with the textile. Thus, under special processing conditions, the particles projected by the jet N2 SC generate craters on the surface of monofilament as well as multifilament fabric, allowing topographical modifications at the yarn scale. Our results showed a significant decrease in fibroblast proliferation with increasing textile roughness compared to untreated one. Moreover, the topography limits the inflammatory reaction on the multifilament fabrics
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Частини книг з теми "Supercritical nitrogen jet"

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Föll, Fabian, Valerie Gerber, Claus-Dieter Munz, Berhand Weigand, and Grazia Lamanna. "On the Consideration of Diffusive Fluxes Within High-Pressure Injections." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 195–208. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_12.

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Анотація:
Abstract Mixing characteristics of supercritical injection studies were analyzed with regard to the necessity to include diffusive fluxes. Therefore, speed of sound data from mixing jets were investigated using an adiabatic mixing model and compared to an analytic solution. In this work, we show that the generalized application of the adiabatic mixing model may become inappropriate for subsonic submerged jets at high-pressure conditions. Two cases are discussed where thermal and concentration driven fluxes are seen to have significant influence. To which extent the adiabatic mixing model is valid depends on the relative importance of local diffusive fluxes, namely Fourier, Fick and Dufour diffusion. This is inter alia influenced by different time and length scales. The experimental data from a high-pressure n-hexane/nitrogen jet injection were investigated numerically. Finally, based on recent numerical findings, the plausibility of different thermodynamic mixing models for binary mixtures under high pressure conditions is analyzed.
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2

Obert, W., C. Mayaux, and G. Perinic. "The Liquid Nitrogen and Supercritical Helium Cooling Loop for the Jet Pumped Divertor Cryopump." In Advances in Cryogenic Engineering, 1569–76. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2522-6_192.

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Тези доповідей конференцій з теми "Supercritical nitrogen jet"

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Terashima, Hiroshi, and Mitsuo Koshi. "Characterization of cryogenic nitrogen jet mixings under supercritical pressures." In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-712.

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2

Rachedi, R. R., L. Crook, and P. E. Sojka. "A Study of Supercritical Jet Fuel Injection." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43445.

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Анотація:
An experimental investigation was conducted to examine the behavior of supercritical fluid (SCF) jets injected into supercritical environments. The behavior of the fluid, JP-10, was studied after it was passed through a pressure-swirl atomizer and entered a nitrogen environment. SCF jet behavior was characterized by the jet cone angle and penetration length. Cone angle and penetration length are reported as functions of density ratio (defined as the ratio of density of the injected fuel to the nitrogen environment), fuel mass flow rate, and pressure-swirl atomizer internal geometry. The density ratio was varied by altering the reduced temperature of the fuel (1.01<Tr<1.10) and nitrogen environment, while keeping the fuel reduced pressure constant at 1.05. Fuel mass flow rate ranged from 1.0 to 3.0 g/s (7.94 to 23.8 lbs/hr). Pressure-swirl atomizer internal geometry was varied by controlling the swirl number, ranging from straight bore to Sn=1.0. It was found that increasing the swirl number for a SCF fluid has the largest effect on jet cone angle, followed by a change in the density ratio; the mass flow rate had the least effect. The penetration length of the SCF jet increased when either the mass flow rate or density ratio increased. The mass concentration field significantly widens when the swirl number of the injector increased, as opposed to changes in the mass flow rate or density ratio which were found to have little effect.
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3

Hosangadi, Ashvin, Chun Lee, Chandrasekhar Kannepalli, and Srinivasan Arunajatesan. "Three-Dimensional Hybrid RANS/LES Simulations of a Supercritical Liquid Nitrogen Jet." In 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-5227.

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4

Chehroudi, B., and D. Talley. "Interaction of acoustic waves with a cryogenic nitrogen jet at sub- and supercritical pressures." In 40th AIAA Aerospace Sciences Meeting & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-342.

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5

КУЗНЕЦОВ, Н. М., С. Н. МЕДВЕДЕВ, С. М. ФРОЛОВ, Ф. С. ФРОЛОВ, Б. БАСАРА та К. ПАХЛЕР. "СВЕРХКРИТИЧЕСКОЕ ИСТЕЧЕНИЕ КРИОГЕННОЙ СТРУИ АЗОТА". У 9th International Symposium on Nonequilibrium Processes, Plasma, Combustion, and Atmospheric Phenomena. TORUS PRESS, 2020. http://dx.doi.org/10.30826/nepcap9b-27.

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Анотація:
Using the wide-range real-gas equation of state (EOS) of nitrogen, the gasdynamic calculations of the supercritical injection of a submerged turbulent jet of cryogenic nitrogen into a chamber filled with nitrogen at normal temperature are performed. The results of calculations are compared with available experimental data on nitrogen density variation in the jet. Satisfactory agreement of the results is obtained.
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6

Hunt, Steven A. "Thermoacoustic Oscillations of Jet-A Fuel in Parallel Heated Flowpaths." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50692.

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Pressure oscillations in supercritical Jet-A fuel flowing through four parallel, heated tubes connected to common manifolds have been observed in this study. Tests were performed with fuel inlet temperatures ranging from 200°F to 700°F, and fuel pressures ranging from 360–700 psi. Total fuel flow rate ranged from 7–37 lb/hr. Tubes were heated by blowing 850–870°F nitrogen over them. Acoustic-mode oscillations, typically ranging from 300–350 Hz, occurred only when a single tube was heated at a time. Pressure oscillation amplitudes ranged from 0.1–1.0 psi. Tube inlet and outlet pressure waveforms were separated by a phase lag that was a function of the manifold cross-passage diameter.
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Rodriguez, Carlos, Alvaro Vidal, Phoevos Koukouvinis, and Manolis Gavaises. "Supercritical and transcritical real-fluid mixing using the PC-SAFT EOS." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.5000.

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A numerical framework has been developed to simulate the mixing of supercritical and transcritical fluids using anequation of state based on statistical associating fluid theory. In a Diesel engine the liquid fuel is injected into supercritical air. After the injection, the Diesel is heated over its critical temperature reaching a supercritical state. Modelling real-fluid effects is critical in order to properly characterize the air/fuel mixing in the combustion chamber. By using the PC-SAFT EoS (Perturbed Chain Statistical Association Fluid Theory Equation of State) real fluids effects can be taken into account in a CFD simulation. The PC-SAFT EoS shows best results than cubic EoS computing liquid density, compressibility, speed of sound, vapor pressures and density derivatives. Unlike cubic EoS, this model accounts for the shape and size of the molecules. Gas, liquid, supercritical and vapor-liquid equilibrium states can be simulated. PT FLASH (Isothermal Multiphase Flash Calculation) is applied to compute the phase diagram used by the code. Shock tube problems were conducted in a wide range of pressures and densities using n-dodecane to show the capability of the developed algorithm. The results were compared with the solution of an exact Riemann solver which has the PC-SAFT EoS implemented showing a high degree of agreement. In addition, a two-dimensional simulation of supercritical nitrogen jet mixing was carried out to checkthe multidimensional capability of the code.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.5000
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Vallee, Nathalie, Guillaume Ribert, Jean-Bernard Blaisot, and Denis Lisiecki. "Experimental investigation of Ethane and Propane injection under sub- and super-critical conditions." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4708.

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Анотація:
Studying a fluid flow under high-pressure conditions through reliable experiments is still nowadays a challenge.When the chamber pressure exceeds the critical pressure of working fluids the supercritical state of matter is reached and the distinction between gas and liquid becomes blurred. For such special conditions, experimental data are scarce and need to be consolidated. Indeed, the modification of the local refractive index induced by den- sity gradient needs to be analyzed with appropriate image-based technique.In the present study, the REFINE test bench (Real-gas Effect on Fluid Injection: a Numerical and Experimental study) has been designed at CORIA Lab to study the non-reactive injection of Ethane and Propane into Nitrogen under sub- and supercritical conditions. The ambient gas pressure can be raised up to 6 MPa and warmed up to 573 K to scan sub- and trans-critical injections. The chamber is equipped with two perpendicular optical axes allowing simultaneously different optical diagnostics. Experimental data are collected from shadowgraph and dif- fused backlight illumination techniques. Quantitative measurements of jet spre ding angle and breakup length arecompared to results coming from literature exhibiting multiple flows topologies.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4708
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Traxinger, Christoph, Hagen Müller, Michael Pfitzner, Steffen Baab, Grazia Lamanna, Bernhard Weigand, Jan Matheis, Christian Stemmer, Nikolaus A. Adams, and Stefan Hickel. "Experimental and Numerical Investigation of Phase Separation due to Multi-Component Mixing at High-Pressure Conditions." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4756.

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Анотація:
Experiments and numerical simulations were carried out in order to contribute to a better understanding and predic-tion of high-pressure injection into a gaseous environment. Specifically, the focus was put on the phase separation processes of an initially supercritical fluid due to the interaction with its surrounding. N-hexane was injected into a chamber filled with pure nitrogen at 5 MPa and 293 K and three different test cases were selected such that they cover regimes in which the thermodynamic non-idealities, in particular the effects that stem from the potential phase separation, are significant. Simultaneous shadowgraphy and elastic light scattering experiments were conducted to capture both the flow structure as well as the phase separation. In addition, large-eddy simulations with a vapor- liquid equilibrium model were performed. Both experimental and numerical results show phase formation for the cases, where the a-priori calculation predicts two-phase flow. Moreover, qualitative characteristics of the formation process agree well between experiments and numerical simulations and the transition behaviour from a dense-gasto a spray-like jet was captured by both.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4756
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Jarczyk, Maria-Magdalena, and Michael Pfitzner. "Large Eddy Simulation of Supercritical Nitrogen Jets." In 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-1270.

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Звіти організацій з теми "Supercritical nitrogen jet"

1

Chehroudi, B., and D. Talley. Interaction of Acoustic Waves with a Cryogenic Nitrogen Jet at Sub- and Supercritical Pressures. Fort Belvoir, VA: Defense Technical Information Center, December 2001. http://dx.doi.org/10.21236/ada410887.

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2

Chehroudi, B., and Doug Talley. Interaction of Acoustic Waves with a Cryogenic Nitrogen Jet at Sub- and Supercritical Pressures. Fort Belvoir, VA: Defense Technical Information Center, April 2001. http://dx.doi.org/10.21236/ada410897.

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