Готові списки джерел за темами / Jet In Cross-Flow (JICF)

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Добірка наукової літератури з теми "Jet In Cross-Flow (JICF)"

Автор: Grafiati

Опубліковано: 8 вересня 2022

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Статті в журналах з теми "Jet In Cross-Flow (JICF)"

Shangguan, Yanqin, Xian Wang, and Yueming Li. "Large-scaled simulation on the coherent vortex evolution of a jet in a cross-flow based on lattice Boltzmann method." Thermal Science 19, no. 3 (2015): 977–88. http://dx.doi.org/10.2298/tsci150606101s.

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Large eddy simulation (LES) is performed on a jet issued normally into a cross-flow using lattice Boltzmann method (LBM) and multiple graphic processing units (multi-GPUs) to study the flow characteristics of jets in cross-flow (JICF). The simulation with 8 1.50?10 grids is fulfilled with 6 K20M GPUs. With large-scaled simulation, the secondary and tertiary vortices are captured. The features of the secondary vortices and the tertiary vortices reveal that they have a great impact on the mixing between jet flow and cross-flow. The qualitative and quantitative results also indicate that the evolution mechanism of vortices is not constant, but varies with different situations. The hairpin vortex under attached jet regime originates from the boundary layer vortex of cross-flow. While, the origin of hairpin vortex in detached jet is the jet shear-layer vortex. The mean velocities imply the good ability of LBM to simulate JICF and the large loss of jet momentum in detached jet caused by the strong penetration. Besides, in our computation, a high computational performance of 1083.5 MLUPS is achieved.

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Regan, Marc A., and Krishnan Mahesh. "Global linear stability analysis of jets in cross-flow." Journal of Fluid Mechanics 828 (September 12, 2017): 812–36. http://dx.doi.org/10.1017/jfm.2017.489.

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The stability of low-speed jets in cross-flow (JICF) is studied using tri-global linear stability analysis (GLSA). Simulations are performed at a Reynolds number of 2000, based on the jet exit diameter and the average velocity. A time stepper method is used in conjunction with the implicitly restarted Arnoldi iteration method. GLSA results are shown to capture the complex upstream shear-layer instabilities. The Strouhal numbers from GLSA match upstream shear-layer vertical velocity spectra and dynamic mode decomposition from simulation (Iyer & Mahesh, J. Fluid Mech., vol. 790, 2016, pp. 275–307) and experiment (Megerian et al., J. Fluid Mech., vol. 593, 2007, pp. 93–129). Additionally, the GLSA results are shown to be consistent with the transition from absolute to convective instability that the upstream shear layer of JICFs undergoes between $R=2$ to $R=4$ observed by Megerian et al. (J. Fluid Mech., vol. 593, 2007, pp. 93–129), where $R=\overline{v}_{jet}/u_{\infty }$ is the jet to cross-flow velocity ratio. The upstream shear-layer instability is shown to dominate when $R=2$, whereas downstream shear-layer instabilities are shown to dominate when $R=4$.

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Tao, Chengfei, and Hao Zhou. "Effects of ‘Oxy’ jet in cross flow on the combustion instability and NOx emissions in lean premixed flame." Thermal Science, no. 00 (2021): 178. http://dx.doi.org/10.2298/tsci201215178t.

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Combustion instability and nitrogen oxides emission are crucial factors for modern gas turbine combustors, which seriously hampers the research and development of advanced combustors. To eliminate combustion instability and NOx emissions simultaneously, effects of the ?Oxy? (CO2/O2, N2/O2, Ar/O2and He/O2) jet in cross flow(JICF)on combustion instability and NOx emissions are experimentally studied. In this research, the flow rate and oxygen ratio of the combustor are varied to evaluate the control effectiveness. Results denotes that all the four oxy fuel gas: CO2/O2, N2/O2, Ar/O2and He/O2, could suppress combustion instability and NOx emissions. The CO2/O2dilution can achieve a better damping results than the other three cases. There are peak values or lowest points of sound pressure amplitude as the parameter of ?Oxy? JICF changes. Mode transition appears in both acoustic signal and CH* chemiluminescence of the flame. But the turning point of mode transition is different. Under the CO2/O2cases, the NOx emission decreases from 22.3ppm to 15.2ppm, the damping ratio of NOxis 40.39%. The flame shape and length were changed under different JICF dilutions. This research could promote the application of jet in cross flow methods on combustion instability or pollutant emissions in gas turbines.

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Chang, Jianlong, Xudong Shao, Jiangman Li, and Xiao Hu. "A Comparison of Classical and Pulsating Jets in Crossflow at Various Strouhal Numbers." Mathematical Problems in Engineering 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/5279790.

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Investigation of the classical and pulsating jet in crossflow (JICF) at a low Reynolds number (Re = 100) has been performed by the LES method based on varied velocity ratios (r= 1~4). Time-averaged particle trajectories are compared in the classical and pulsating JICF. The formation mechanism and the corresponding flow characteristics for the counter-rotating vortex pair (CRVP) have been analyzed. An unexpected “vortex tail” has been found in the JICF at higher velocity ratio due to the enhanced interactions indicated by the increased jet momentum among the CRVP, upright vortices, and shear layers. The analysis of time-averaged longitudinal vorticity including a coupling mechanism between vortices has been performed. The returning streamlines appear in the pulsating JICF, and two extra converging points emerge near the nozzle of the jet at different Strouhal numbers. The temperature profiles based on the iso-surface for the classical and pulsating JICF have been obtained computationally and analyzed in detail.

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Souza, Pedro R. C., Odenir de Almeida, and Carlos R. Ilário da Silva. "Aeroacoustic Investigation of High Subsonic Jets in Crossflow." Journal of Theoretical and Computational Acoustics 26, no. 04 (December 2018): 1850031. http://dx.doi.org/10.1142/s2591728518500317.

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The present work investigates the flow and the sound field generated by high subsonic jets in crossflow (JICF). The problem arises when a jet is exhausted perpendicularly into a moving medium. Although being characterized as a very complex flow, the JICF has a well-known fluid dynamics, but a sound field yet to be more explored. Therefore, a hybrid methodology of low computational cost aeroacoustic prediction tool is applied in this work for the complete investigation of this problem. A single jet operating at Mach number 0.75 in a crossflow regime with effective velocity ratios of 4 and 8 is studied herein. The fluid dynamics is solved by the Reynolds Average Navier–Stokes (RANS) equations, and the noise calculations are performed using a statistical method known as the Lighthill Ray-Tracing (LRT) method. The numerical results for the acoustic and flow fields were in reasonable agreement with the experimental data available showing good applicability of this kind of methodology for solving JICF.

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Grout, R. W., A. Gruber, H. Kolla, P. T. Bremer, J. C. Bennett, A. Gyulassy, and J. H. Chen. "A direct numerical simulation study of turbulence and flame structure in transverse jets analysed in jet-trajectory based coordinates." Journal of Fluid Mechanics 706 (July 10, 2012): 351–83. http://dx.doi.org/10.1017/jfm.2012.257.

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AbstractAn${\mathrm{H} }_{2} / {\mathrm{N} }_{2} $jet in cross-flow (JICF) of air is studied using three-dimensional direct numerical simulation with and without chemical reaction in order to investigate the role of the complex JICF turbulent flow field in the mechanism of fast fuel-oxidant mixing and of aerodynamic flame stabilization in the near field of the jet nozzle. Focus is on delineating the flow/mixing/chemistry conditions that are necessary and/or sufficient to achieve flame anchoring that ultimately enables the formulation of more reliable and precise guidelines for design of fuel injection nozzles. A mixture averaged diffusion formulation that includes the effect of thermal diffusion is used along with a detailed chemical kinetics mechanism for hydrogen–air combustion. A new parametrization technique is used to describe the jet trajectory: solution of Laplace’s equation upon, and then within, an opportune scalar surface anchored by Dirichlet boundary conditions at the jet nozzle and plume exit from the domain provides a smoothly varying field along the jet path. The surface is selected to describe the scalar mixing and reaction associated with a transverse jet. The derived field,$j(\mathbi{x})$, is used as a condition to mark the position along the natural jet trajectory when analysing the variation of relevant flow, mixing and reaction quantities in the present direct numerical simulation (DNS) datasets. Results indicate the presence of a correlation between the flame base location in parameter space and a region of low velocity magnitude, high enstrophy, high mixing rate and high equivalence ratio (flame root region). Instantaneously, a variety of vortical structures, well known from the literature as important contributors to fuel-oxidant mixing, are observed in both inert and reactive cases with a considerable span in length scales. Moreover, instantaneous plots from reactive cases illustrate that the most upstream flame tongues propagate close to the trailing edge of the fuel jet potential core near the jet shear layer vortex shedding position. Some degree of asymmetry with respect to the domain mid-plane in the spanwise direction is observed in the averaged fields, both for the inert and reactive cases.

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Anwar, Habib O. "Flow of Surface Buoyant Jet in Cross Flow." Journal of Hydraulic Engineering 113, no. 7 (July 1987): 892–904. http://dx.doi.org/10.1061/(asce)0733-9429(1987)113:7(892).

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Gogineni, S. P., M. M. Whitaker, L. P. Goss, and W. M. Roquemore. "Dynamics of Jet in Cross Flow." Physics of Fluids 7, no. 9 (September 1995): S5. http://dx.doi.org/10.1063/1.4757295.

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SUZUKI, Nobuyoshi, Masaru KIYA, Osamu MOCHIZUKI, and Hidenori JINZU. "A Pulsating Round Jet in Cross Flow." Transactions of the Japan Society of Mechanical Engineers Series B 63, no. 605 (1997): 106–11. http://dx.doi.org/10.1299/kikaib.63.605_106.

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Seiler, F., P. Gnemmi, H. Ende, M. Schwenzer, and R. Meuer. "Jet interaction at supersonic cross flow conditions." Shock Waves 13, no. 1 (July 1, 2003): 13–23. http://dx.doi.org/10.1007/s00193-003-0189-y.

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Дисертації з теми "Jet In Cross-Flow (JICF)"

Subramanian, Arunprasath. "Contribution to Aerothermal Study of a Film Cooling Geometric Design using ZnO Phosphorescence Thermography and Numerical Simulations." Electronic Thesis or Diss., Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2022. http://www.theses.fr/2022ESMA0006.

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Le refroidissement par film froid des aubes des turbines aéronautiques d’avion est utilisé depuis quelques décennies pour augmenter la température d'entrée de la turbine (TIT) et ainsi augmenter la poussée, et également pour prolonger la durée de vie de l'aube de turbine. Les normes d'émission strictes des polluants encouragent l'amélioration de l'efficacité globale de la turbine et donc l’optimisation du processus de refroidissement par film. C’est une technique par convection forcée dans laquelle un jet froid est injecté à travers des trous discrets à la surface de l'aube de turbine de manière à former une couche d'air frais sur la surface de l'aube protégeant efficacement l'aube des flux à très haute température résultant de la combustion. Ce principe peut être étudié académiquement comme un jet débouchant dans un écoulement transverse. Cet écoulement est très complexe parce que de nombreuses structures cohérentes turbulentes se développent et interagissent les unes avec les autres. L'un des systèmes de tourbillons les plus importants est la paire de tourbillons contra-rotatifs (CRVP) résultant des contraintes de cisaillement qui se développent dans la couche de mélange supérieure entre le jet débouchant et le jet principal. La courbure du jet débouchant le long de la direction du flux transversal intensifie le développement du CRVP qui augmente ainsi le mélange entre les deux écoulements, ce qui réduit l'efficacité du film de refroidissement. Par conséquent, dans cette étude, une organisation spatiale de trous auxiliaires est étudiée expérimentalement et numériquement pour réduire l'intensité de l’influence du CRVP, ce qui contribue finalement à augmenter l'efficacité du refroidissement du film adiabatique. Les trous auxiliaires, placés en amont du trou principal, permettent de réduire l'intensité du CRVP issu du trou principal du fait de la diminution des contraintes de cisaillement subies par le jet issu du trou principal. Dans cette thèse, une méthode numérique basée sur des simulations RANS utilisant le modèle de turbulence k-ω SST a été utilisée pour optimiser l’organisation spatiale des trous auxiliaires et pour avoir une compréhension préliminaire de ces interactions de structures cohérentes. Une étude détaillée de la structure instationnaire de l'écoulement a également été réalisée à l'aide de la simulation aux grandes échelles L.E.S. Pour étudier expérimentalement les champs de température dans le fluide, une métrologie de mesure de température a été spécialement développée : la thermométrie utilisant le rapport d’intensités spectrales d’émission de phosphorescence du ZnO à l’aide d’une seule caméra intensifiée. Cette technique permet la mesure de la température instantanée et moyenne de manière non intrusive. Une analyse détaillée des propriétés d'émission du luminophore ZnO excitée par un laser à 266 nm est décrite. Une procédure d'étalonnage a été développée et testée dans une cavité Rayleigh-Bénard remplie d’eau. Ensuite, cette procédure a été mise en œuvre sur le nouveau banc d'essai BATH pour étudier expérimentalement le film de refroidissement dimensionné par la simulation RANS pour trois taux de soufflage. L'analyse des résultats expérimentaux et numériques aide à identifier les structures cohérentes clés, conduisant à une meilleure compréhension des phénomènes physiques mis en jeu et à appréhender l'augmentation de l'efficacité de refroidissement du film dans le système de trous auxiliaires par rapport à un trou cylindrique simple classique
Film cooling of aircraft gas turbine blades has been in use since a few decades now to improve the Turbine Inlet Temperature (TIT) and to extend the lifetime of the turbine blade. Additionally, stringent emission norms stipulate the improvement of overall efficiency of the gas turbine engine and hence the need to improve film cooling process. Film cooling is a technique where a cold jet is injected through discrete holes on the surface of the turbine blade, so as to form a layer of cool air over the surface of the blade, effectively protecting the blade from high temperature crossflows arising from the combustion chamber. This problem can be viewed as a Jet In Cross-Flow (JICF) phenomena where the interaction of the crossflow with a jet injected perpendicular or at an angle creates a system of vortices. One of the most important vortex systems in this arrangement is the Counter Rotating Vortex Pair arising from the shear forces at the sides of the ejecting jet with the crossflow primarily. The bending of the jet along the direction of the crossflow promotes the CRVP to ingest hot crossflow into the jet stream which reduces the effectiveness of the film cooling system. Hence, in this study, an auxiliary hole system is studied experimentally and numerically to reduce the intensity and the height of the CRVP which eventually helps in an augmented adiabatic film cooling effectiveness. The auxiliary holes placed upstream of the main film cooling hole reduces the intensity of the main hole CRVP due to the reduction in the shear forces experienced by the jet emanating from the main hole. In this thesis numerical analysis through RANS study using k-ω SST turbulence model to have a preliminary understanding of the auxiliary hole system and a detailed understanding of the flow structure using Large Eddy Simulation are performed. The highlight of this work is the development of single camera phosphor thermometry using the spectral intensity ratio method. This technique allows the measurement of the instantaneous and mean flow temperature non-intrusively. A detailed analysis of the emission properties of ZnO phosphor upon excitation by a 266nm laser is described. A calibration procedure for the intensity ratio method is defined and it is tested using a Rayleigh-Bénard natural convection process. This phosphor thermometry procedure with the validated code is implemented on the new BATH test Rig to study film cooling arrangements. Three different configurations are tested for their aero-thermal characteristics at penetration blowing ratio regime. Analysis of the experimental and numerical results help in identifying key vortex structures, leading to the better understanding of reasons for the augmentation of film cooling effectiveness in the auxiliary hole system compared to a classical simple cylindrical hole

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Lanitis, Nicolas. "The turbulent structure of the jet in cross-flow." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/246593.

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In this thesis the structure of the jet in cross flow in the far field was investigated experimentally using time-resolved, multi-scale and statistically independent Stereoscopic Particle Image Velocimetry measurements to reveal the mean and instantaneous three-dimensional (3D) structures. All of the measurements were performed in the Counter-rotating Vortex Pair (CVP) plane for a high velocity ratio and jet Reynolds number. Statistical measurements at various downstream locations and velocity ratios are presented. Probability density functions of the streamwise vorticity field showed that each CVP core is instantaneously made of a number of small vortex tubes rather than a single vortex core. The characteristic ‘kidney’ shape was illustrated in the rms velocity profiles and the Reynolds stress profiles exhibited a high level of organisation which showed an evolving shape with downstream distance and persisted well into the far field. Two point spatial correlations pointed to a common structure for all conditions whose mean shape generates the ‘kidney’ shape, as well as evidence of wake structures. Time-resolved measurements were carried out in a moving and stationary frame of reference, converted to 3D measurements via the use of Taylor’s hypothesis. The origin of the ‘kidney’ shape and large degree of spatial order in the far field was found to be a result of an organised ‘train’ of consecutive hairpin, roller and wake structures. Together, these structures provide a physical explanation that reconciles the statistical and instantaneous structure of the CVP.

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Ugrina, Sandra. "Experimental analysis and analytical modeling of synthetic jet-cross flow interactions." College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/6920.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.
Thesis research directed by: Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Freedland, Graham. "Investigation of Jet Dynamics in Cross-Flow: Quantifying Volcanic Plume Behavior." PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/3314.

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Volcanic eruption columns inject high concentrations of ash into the atmosphere. Some of this ash is carried downwind forming ash clouds in the atmosphere that are hazardous for private and commercial aviation. Current models rely on inputs such as plume height, duration, eruption rate, and meteorological wind fields. Eruption rate is estimated from plume height using relations that depend on the rate of air entrainment into the plume, which is not well quantified. A wind tunnel experiment has been designed to investigate these models by injecting a vertical air jet into a cross-flow. The ratio of the cross-flow and jet velocities is varied to simulate a weak plume, and flow response is measured using particle image velocimetry. The plumes are characterized and flow data relative to the centerline is examined to measure the growth of weak plumes and the entrainment velocity along its trajectory. It was found that cross-flow recirculates behind the jet and entrainment occurs both up and downstream of the jet. Analysis of the generation of turbulence enhanced results by identifying the transition point to bending plume and the growth of the shear layer in a bending plume. This provides information that can be used to improve models of volcanic ash concentration changes in the atmosphere.

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Cameron, Andrew William. "Structure of a low-momentum elevated jet in a cross-flow." Thesis, University of Ottawa (Canada), 2008. http://hdl.handle.net/10393/27960.

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An elevated jet in a cross-flow is a free jet issuing orthogonally into a dominant cross-wind from a pipe extending above a ground-induced boundary layer. The present thesis is concerned with jets having low momentum-flux relative to the cross-flow. It presents flow visualization and velocity measurements conducted in a variable-speed, closed-circuit water channel. Four major types of coherent structures were identified: von Karman vortices, a pipe-end vortex, shear-layer vortices, and tendrils. The von Karman vortices are similar to those shed by a finite cylinder with a free end. The pipe-end vortex is a stationary vortex forming immediately downstream of the pipe-end. The shear-layer vortices are formed by the Kelvin-Helmholtz instability in the mixing layer between the cross-flow and the jet. Finally, the tendrils are evolutions of sections of the shear-layer vortices, formed under certain conditions as the latter are stretched by the pipe-end vortex and move downstream. The size of the pipe-end vortex is insensitive to the momentum-flux ratio as long as the latter is less than a critical value. For higher momentum-flux ratios, the pipe-end vortex grows in size and shifts beyond the free-end of the pipe. The Strouhal numbers of the shear-layer vortices and the tendrils increase drastically as the momentum-flux ratio decreases. The shear-layer vortices, marking the jet fluid, move away from the pipe exit upon their generation, then reverse direction as they pass over the pipe-end vortex, while accelerating in the streamwise direction until their velocities approach the cross-flow speed. A vorticity balance for each type of the vortices has been attempted. The von Karman vortices obtain their vorticity from the pressure gradient along the outer surface of the pipe. The pipe-end vortex acquires its vorticity from the shear-layer vortices and generates some vorticity in a pressure gradient on the outer surface of the pipe as well. The shear-layer vortices acquire their vorticity from the cross-flow fluid flowing over the edge of the upstream pipe tip as well as from the vorticity inside the pipe from the jet flow. The vorticity in the tendrils originates in the shear-layer vortices.

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Majeski, Adrian Jason. "Size and shape of low momentum jet diffusion flames in cross flow." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0004/MQ59841.pdf.

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Lawal, Mohammed Shariff. "Numerical modelling of jet flames in a cross-flow : application to flares." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539693.

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Toften, Terje HaÌŠkon. "Effects of free-stream turbulence on a jet in a cross-flow." Thesis, University of Hertfordshire, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241571.

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Carrotte, Jonathan F. "The mixing characteristics of dilution jets issuing into a confined cross-flow." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/32627.

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An experimental investigation has been carried out into the mixing of a row of jets injected into a confined cross-flow. Measurements were made on a fully annular test facility, the geometry of the rig simulating that found in the dilution zone of a gas turbine combustion chamber. A small temperature difference of 44°C between the cross-flow and dilution fluid allowed the mixing characteristics to be assessed, with hot jets being injected into a relatively cold cross-flow at a jet to cross-flow momentum flux ratio of 4.0. The investigation concentrated on differences in the mixing of individual dilution jets, as indicated by the regularity of the temperature patterns around the cross-flow annulus. Despite the uniform conditions approaching the dilution holes there were significant differences in the temperature patterns produced by the dilution jets around the annulus.

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Fernandez, Jorge Enrique Alvarez. "Calculation of the velocity and temperature fields in a jet in cross-flow." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389408.

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Книги з теми "Jet In Cross-Flow (JICF)"

North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Computational and experimental assessment of jets in cross flow: Papers presented and discussions recorded at the Fluid Dynamics Panel Symposium held in Winchester, United Kingdom, from 19th-22nd April 1993. Neuilly-sur-Seine: AGARD, 1993.

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North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Computational and experimental assessment of jets in crossflow. Neuilly sur Seine, France: AGARD, 1993.

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Liscinsky, D. S. Experimental study of cross flow mixing in cylindical and rectangular ducts. Cleveland, Ohio: Lewis Research Center, 1993.

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Harloff, G. J. Three-dimensional viscous flow computations of a circular jet in subsonic and supersonic cross flow. [Washington, DC]: National Aeronautics and Space Administration, 1988.

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Harloff, G. J. Three-dimensional viscous flow computations of a circular jet in subsonic and supersonic cross flow. [Washington, DC]: National Aeronautics and Space Administration, 1988.

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Flint, Kenneth Ross. Dispersion of round turbulent jet injected from an elevated source into a cross-flow. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1992.

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Wark, Candace. Development of a temperature measurement system with application to a jet in a cross flow experiment. [Washington, D.C.]: National Aeronautics and Space Administration, 1985.

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Boutazakhti, Mohamed. The effect of jet mixing on the combustion efficiency of a hot, fuel-rich cross-flow. Ottawa: National Library of Canada, 2000.

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John, D. St. Effect of jet injection angle and number of jets on mixing and emissions from a reacting crossflow at atmospheric pressure. [Washington, D.C.]: National Aeronautics and Space Administration STI Preogram Office, 2000.

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Holdeman, J. D. Mixing of multiple jets with a confined subsonic crossflow. [Washington, DC]: National Aeronautics and Space Administration, 1997.

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Частини книг з теми "Jet In Cross-Flow (JICF)"

Kelso, R. M., T. T. Lim, and A. E. Perry. "A Visual Study of a Round Jet in Cross-Flow." In Flow Visualization VI, 173–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_27.

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Kozlov, Victor V., Genrich R. Grek, and Yury A. Litvinenko. "Round Jets in a Cross Shear Flow." In Visualization of Conventional and Combusting Subsonic Jet Instabilities, 65–85. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26958-0_7.

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Uruba, Václav, Oton Mazur, and Pavel Jonáš. "The Jet in Cross-Flow: A Few Remarks on the Cross-Flow Structure Influence." In Manipulation and Control of Jets in Crossflow, 77–86. Vienna: Springer Vienna, 2003. http://dx.doi.org/10.1007/978-3-7091-2792-6_7.

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Cavar, D., K. E. Meyer, S. Jakirlić, and S. Šarić. "LES Based POD Analysis of Jet in Cross Flow." In Direct and Large-Eddy Simulation VII, 253–59. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3652-0_38.

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Abhay Kumar, Manish Gupta, Arun K. Saha, and P. K. Panigrahi. "Flow Characteristics of Synthetic Jet on Torpedo Shape Model in Cross Flow." In Fluid Mechanics and Fluid Power – Contemporary Research, 239–47. New Delhi: Springer India, 2016. http://dx.doi.org/10.1007/978-81-322-2743-4_24.

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Havermann, M., and F. Seiler. "Boundary Layer Influence on Supersonic Jet/Cross-Flow Interaction in Hypersonic Flow." In New Results in Numerical and Experimental Fluid Mechanics V, 281–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-33287-9_35.

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Papaspyros, J. N. E., P. N. Papanicolaou, E. G. Kastrinakis, and S. G. Nychas. "Mixing of a Turbulent Round Buoyant Jet in Cross Flow." In Fluid Mechanics and Its Applications, 403–7. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0457-9_73.

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Stapountzis, H. "Oblique Impingement of a Circular Jet in a Cross Flow." In Advances in Turbulence IV, 231–35. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1689-3_38.

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Adeli, R., and F. Seiler. "Side Jet/Cross Flow Interaction at Hypersonic Re-entry Conditions." In 29th International Symposium on Shock Waves 1, 533–38. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16835-7_84.

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Nychas, S. G., J. N. E. Papaspyros, P. N. Papanicolaou, and E. G. Kastrinakis. "Coherent Contribution to the Turbulent Mixing of a Buoyant Jet in Cross Flow." In Advances in Turbulence VI, 125–28. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0297-8_36.

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Тези доповідей конференцій з теми "Jet In Cross-Flow (JICF)"

Bravo, Luis G., Dokyun Kim, Frank Ham, and Kevin A. Kerner. "High Fidelity Simulations of Primary Breakup and Vaporization of Liquid Jet in Cross Flow (JICF)." In 2018 Joint Propulsion Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-4683.

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Esmaeili, Mostafa, and Asghar Afshari. "LES/FMDF of Mixing in Turbulent Jet in Cross-Flows." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21945.

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In this study, an Eulerian-Lagrangian computational methodology is utilized for large eddy simulation (LES) of mixing phenomena in jet in cross-flows. A high-order multi-block algorithm is used to solve Eulerian equations in a generalized coordinate system. The composition is formulated based on the filtered mass density function (FMDF) and its equivalent stochastic Lagrangian equations, which is solved by Lagrangian Monte-Carlo method. Parameters influencing mixing enhancement including jet velocity profile, and jet pulsation are investigated. A good consistency between Eulerian and Lagrangian components of the numerical scheme is established. In jet in cross-flow (JICF) simulations, the vortical structures and flow features are predicted with the current numerical scheme. The results also show that the jet velocity profile affects both trajectory and mixing condition and the jet pulsation can enhance mixing depending on the Strouhal numbers. The obtained results including concentration distributions are in good agreement with available experimental data ensuring the performance and reliability of LES/FMDF methodology to study mixing in relatively complex flow configurations such as JICF.

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Bravo, Luis G., Dokyun Kim, Frank Ham, and Kevin A. Kerner. "Correction: High Fidelity Simulations of Primary Breakup and Vaporization of Liquid Jet in Cross Flow (JICF)." In 2018 Joint Propulsion Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-4683.c1.

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Tan, Zu Puayen, Eugene Lubarsky, Oleksandr Bibik, Dmitriy Shcherbik, and Ben T. Zinn. "Application of Planar Laser-Induced Phosphorescence to Investigate Jet-A Injection Into a Cross-Flow of Hot Air." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25661.

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This paper describes the development of the Planar Laser-Induced Phosphorescence (PLIP) technique for mapping the fuel temperature and concentration distributions in a jet-in-cross-flow (JICF) spray study. The spray was produced by injecting cold liquid Jet-A into hot cross-flowing air. The application of PLIP required the seeding of liquid fuel with micron-size thermographic phosphor particles before injection. The resulting spray produced phosphorescence and droplets Mie-scattering signals when illuminated by a 355nm planar UV laser sheet of 0.054J/pulse energy. The technique was investigated as a potential alternative to the use of Jet-A Planar Laser-Induced Fluorescence (PLIF) for the mapping of fuel concentration in sprays, because the low signal intensity of Jet-A’s fluorescence at high T prevents the use of the PLIF approach. In contrast, PLIP provides a strong signal at high T, and allows the simultaneous determination of local T and fuel concentration when two spectral bands of the phosphorescence emission are imaged and their ratio-of-intensities (RI) determined. In addition, the locations where liquid fuel droplets exist were imaged from the UV Mie-scattering of the laser-sheet (which can also be done in PLIF). In the present investigation, an optical system that imaged two spectral bands of phosphorescence and one wavelength of Mie-scattering was developed. It consisted of three CCD cameras with dichroic beam-splitters and interference narrow bandpass filters. The spray-pattern within a span of ∼80×30 orifice diameters was captured, with spatial resolution of about 0.1mm/px. The investigated jet-in-cross-flow spray was produced by injecting Jet-A fuel from a 0.671mm diameter orifice located on the wall of a rectangular channel (25.4×31.75mm cross-section). The cross-flow air was preheated to temperatures encountered in modern gas turbines (up to 480°C), while the temperature of the injected Jet-A fuel was in the T = 27–80°C range. YVO4:Eu phosphor particles with a median size of 1.8 microns were used to seed the fuel. Since the emissions of the commonly used Dy:YAG thermographic phosphor were found to be too weak and had wavelengths that overlapped with Jet-A fluorescence signals, YVO4:Eu was used for the JICF studies instead. It was observed that while the emissions of YVO4:Eu were stronger than Dy:YAG, the range of T where it can be applied in the PLIP technique was more limited — just sufficient for the investigated JICF. Preliminary results from the study showed rapid changes in fuel concentration and T from the injector up to z/dinj∼30 for momentum ratios of J = 5, 10 and 20, followed by a more gradual mixing/heat-up downstream. It was also found that deposition of phosphor particles on channel-walls interfered with the spray characterization, reducing the accuracy of the measurements.

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Jain, Nishant, and Jerry M. Seitzman. "Mixing and Combustion Characterization of a Staged Combustor With Multiple, High Mass-Ratio Jets in Crossflow." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-65016.

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This study focuses on elucidating the flow and combustion features in the jet/pilot interaction zone of RQL-type air-staged combustors. Multiple air jets enter normally into a vitiated crossflow consisting of the combustion products of natural gas and air (up to an equivalence ratio of ϕ∼1.3). These jets in crossflow (JICF) interact in a test-section with a rectangular cross section whose dimensions are only 3–4 times the size of the jet diameters. In the test section, a total of five jets (three on the bottom and two on the top) can be used to attain parallel and staggered-opposed jet configurations. The combustion and mixing properties are examined using chemiluminescence imaging and planar Mie scattering from seed particles, with the latter also used for PIV velocity measurements. Results are acquired for mass ratios (total jet mass flow to pilot mass flow) as high as two. At these high mass ratios, the jet velocities range from 50–250 m/s while the pilot (crossflow) velocity ranges from 5–35 m/s. At high mass ratios, and therefore high jet momentum ratios, the jets impinge on the opposite walls well before they can transition into a typical far-field regime for unconfined JICF configurations. In these cases, the jet-wall interaction plays a significant role in redirecting the jet momentum and mixing the jet and crossflow fluids. In the case of the staggered-opposed jet configurations, the jet-wall interaction of a jet can greatly influence the near-field region of its neighboring opposed jet. With the high temperature crossflow, chemical times are sufficiently fast that combustion seem to be mixing limited rather than chemistry limited under the conditions considered.

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Ji, Yongbin, Bing Ge, and Shusheng Zang. "Investigation of Flow Characteristics in a Combustor With Opposed Jets." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76278.

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Jet-in-cross flow (JICF) has been investigated broadly because of its wide engineering application, for example in the gas turbine field, film cooling on the turbine vanes and blades, primary and dilution jets in the combustors and so on. In the gas turbine combustors, the main flow is generated by the swirlers to stabilize the flame, which induces complicated 3D flow characteristics. Different from uniform main flow, swirling cross flow has a strong tangential velocity component, which will deflect the jets in the circumferential direction as well as in the streamwise direction. So, the degradation behavior of the jets is more complex than that in the uniform cross flow. This paper presents PIV measurement of the flow field inside of a three-nozzle annular combustor with opposed quenching jets on the liner walls. Dry ice as a newly proposed flow tracer was proposed and tried. The momentum flux ratio and jet holes configuration are studied to evaluate their effects on the primary recirculation zone, downstream flow field. Finally, numerical simulation was also performed to reveal 3D flow characteristics as well as turbulent kinetic energy generation. The results show that momentum flux ratio has a dominant influence on flow characteristics in the combustor. Getting better understanding of jets behavior in the swirling cross flow helps optimization design of quenching or dilution holes geometry and arrangement for the gas turbine combustor, which turns to be very beneficial to the low-emission and high efficient combustor development.

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Zaman, K. B. M. Q. "Unsteady Jets in Crossflow." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56822.

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The effect of periodic perturbation on a jet in a cross-flow (JICF) is reviewed. In the first part of the paper, flow visualization results from several past works are discussed. Beginning with a description of the characteristic vortex systems of a JICF it is shown that specific perturbation techniques work by organizing and intensifying specific vortex systems. Oscillatory blowing works primarily through an organization of the shear layer vortices. A mechanical perturbation technique is found to organize the wake vortices. In the second part of the paper, results of an ongoing experiment involving another mechanical perturbation technique are discussed. It involves two tabs at the orifice exit whose asymmetry in placement is reversed periodically. It directly modulates the counter-rotating vortex pair (CVP). Effects of the perturbation for an array of three adjacent orifices are explored. The flowfield data show an improvement in mixing compared to the unperturbed case.

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Javadi, Khodyar, Mohammad Taeibi-Rahni, and Masoud Darbandi. "Evaluation of RANS Approach in Predicting the Physics of Incompressible Turbulent Jets-Into-Crossflows." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41114.

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This work is conducted with evaluation of different turbulence models capabilities in predicting three dimensional jet-into-crossflow (JICF) interactions. For this purpose, first of all, comprehensive discussions on the near wall flow complexities due to discharge of a jet into a crossflow are presented. In this regards, large scale coherent structures such as: counter rotating vortex pairs (CRVP’s), near wall secondary motions, horseshoe vortices, and wall jets like are discussed. Secondly, the abilities of different turbulence models in predicting such flows (JICF) are evaluated. Our evaluation is based on three points of view including: 1) JICF characteristics, 2) computed location, and 3) sensitivity to different flow variables. In this regard, the turbulence models such as k-ε, k-ω, shear stress transport model (SST), and Reynolds stress model (RSM) are employed. Their related results are compared to credential available experimental/numerical data as well themselves. Since the same basic code with the same grid density as well as numerical discretization scheme is used, it is save to conclude that, any differences in the results are due to the abilities of turbulence models. The flow field computation was governed by Reynolds Averaged Navier-Stokes (RANS) equations performing finite volume method with SIMPLE algorithm over a non-uniform structured grid.

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Renze, Peter, Wolfgang Schro¨der, and Matthias Meinke. "Large-Eddy Simulation of Film Cooling Flow Ejected in a Shallow Cavity." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50120.

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In the present paper the flow field of a film cooling configuration with cylindrical holes embedded in a shallow cavity is investigated using large-eddy simulation (LES). The cooling jet is injected through a single row of inclined holes from a transverse cavity into a turbulent flat plate boundary layer at a temperature ratio of TR = 0.44. The mixing of the cooling fluid and the crossflow within the cavity is a highly unsteady process generating complex vortical structures. The impact of the boundary layer separation at the upstream cavity edge on the jet-crossflow interaction is studied in detail. The driving mechanisms of the momentum and heat exchange between the jet and the crossflow are identified and discussed. The flow field and the adiabatic cooling efficiency is compared to a standard cylindrical film cooling configuration without a cavity. The development of the counter-rotating vortex pair (CVP) downstream of the jet injection is investigated. An analysis of the vortex dynamics shows an impinging behavior of the jet fluid in this area. The Reynolds stress shows a more two-dimensional distribution compared to the anisotropic nature of the jet-in-a-crossflow (JICF) at standard cylindrical holes. Since the heat exchange is closely connected to the transport of momentum in the mixed boundary layer, this observation explains the enhanced lateral spreading of the cooling fluid.

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Kroniger, Daniel, Atsushi Horikawa, Harald H. W. Funke, Franziska Pfaeffle, Tsuyoshi Kishimoto, and Koichi Okada. "Experimental and Numerical Investigation on the Effect of Pressure On Micromix Hydrogen Combustion." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-58926.

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Abstract The micromix (MMX) combustion concept is a DLN gas turbine combustion technology designed for high hydrogen content fuels. Multiple non-premixed miniaturized flames based on jet in cross-flow (JICF) are inherently safe against flashback and ensure a stable operation in various operative conditions. The objective of this paper is to investigate the influence of pressure on the micromix flame with focus on the flame initiation point and the NOx emissions. A numerical model based on a steady RANS approach and the Complex Chemistry model with relevant reactions of the GRI 3.0 mechanism is used to predict the reactive flow and NOx emissions at various pressure conditions. Regarding the turbulence-chemical interaction, the Laminar Flame Concept (LFC) and the Eddy Dissipation Concept (EDC) are compared. The numerical results are validated against experimental results that have been acquired at a high pressure test facility for industrial can-type gas turbine combustors with regard to flame initiation and NOx emissions. The numerical approach is adequate to predict the flame initiation point and NOx emission trends. Interestingly, the flame shifts its initiation point during the pressure increase in upstream direction, whereby the flame attachment shifts from anchoring behind a downstream located bluff body towards anchoring directly at the hydrogen jet. The LFC predicts this change and the NOx emissions more accurately than the EDC. The resulting NOx correlation regarding the pressure is similar to a non-premixed type combustion configuration.

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Звіти організацій з теми "Jet In Cross-Flow (JICF)"

Freedland, Graham. Investigation of Jet Dynamics in Cross-Flow: Quantifying Volcanic Plume Behavior. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.3294.

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Wu, J. M., A. D. Vakili, and F. M. Yu. Investigation of Non-Symmetric Jets in Cross Flow (Discrete Wing Tip Jet Effects). Fort Belvoir, VA: Defense Technical Information Center, December 1986. http://dx.doi.org/10.21236/ada179783.

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Freedland, Graham. Entrainment Processes for a Jet in Cross-flow: The Quantification of Turbulent Contributions and their Importance on Accurate Modeling. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.7490.

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Ghenai, C., G. P. Philippidis, and C. X. Lin. Active Control Strategies to Optimize Supersonic Fuel-Air Mixing for Combustion Associated with Fully Modulated Transverse Jet in Cross Flow. Fort Belvoir, VA: Defense Technical Information Center, December 2005. http://dx.doi.org/10.21236/ada443378.

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Abdilghanie, A., C. E. Frouzakis, and P. F. Fischer. Direct Numerical Simulation of Autoignition in a Jet in a Cross-Flow Configuration: ALCF-2 Early Science Program Technical Report. Office of Scientific and Technical Information (OSTI), May 2013. http://dx.doi.org/10.2172/1079766.

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