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Author : T.-M. Liou
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Computational Study of Flow Field in Sideinlet Ramjet Combustors written by T.-M. Liou and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flow field computational analysis in a solid fuel ramjet combustor written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Essa dissertação realiza uma análise do escoamento reativo e turbulento no interior do combustor de um estato reator a combustível sólido. Investiga-se diferentes modelos para prever a pirólise do combustível sólido. O modelomatemático é baseado na solução numérica das equações de conservação de massa, quantidade de movimento linear, energia e equações de transporte para quantidades escalares. O modelo de turbulência empregado é o (constante de Von Kármán -taxa de dissipação da energia cinética turbulenta) para altos Reynolds e na modelagem da combustão emprega-se o formalismo da fração de mistura/função densidade de probabilidade prescrita. Próximo às paredes, a lei da parede é usada, sendo a camada limite dividida em duas regiões, uma subcamada laminar e uma região totalmente turbulenta. As transferências de calor e massa para as paredes são calculadas utilizando-se a lei da parede modificada com uso de um parâmetro de transferência de massa. Os resultados obtidos através do modelo proposto foram comparados com os resultados obtidos anteriormente comoutros modelos e com dados experimentais, verificando-se que os mesmos apresentam um boa concordância com os dados existentes na literatura, concluindo-se que o modelo é satisfatório para o problema proposto.
Author :
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ISBN 13 :
Total Pages : 426 pages
Book Rating : 4.0/5 ( download)
Download or read book AIAA/ASME/SAE/ASEE 24th Joint Propulsion Conference written by and published by . This book was released on 1988 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : K. Kailasanath
Publisher :
ISBN 13 :
Total Pages : 39 pages
Book Rating : 4.:/5 (227 download)
Download or read book Numerical Simulations of the Flowfield in Central-Dump Ramjet Combustors. 2. Effects of Inlet and Combustor Acoustics written by K. Kailasanath and published by . This book was released on 1988 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: A potentially important source of large pressure oscillations in compact ramjets is a combustion instability induced by the interaction of large-scale vortex structures with the acoustic modes of the ramjet. To study these interactions, we have performed time-dependent, compressible numerical simulations of the flow field in an idealized ramjet consisting of an axisymmetric inlet and a combustor. The simulations indicate strong coupling between the flow field and the acoustics of both the inlet and the combustor. For the cases studied, forcing at the first longitudinal acoustic mode of the combustor induces vortex-rollup near the entrance to the combustor at that frequency. A low frequency oscillation is also observed in all the simulations. Pressure and velocity fluctuations in the inlet indicate that the low frequency corresponds to a quarter-wave mode in the inlet. Changing the length of the inlet appropriately changes the observed low frequency. The merging pattern of the inlet is changed. These merging patterns are explained on the basis of an interaction between the vortex-rollup frequency and the acoustic modes of the inlet and combustor. Keywords: Ramjet, Combustion instability, Turbulence. (mjm).
Author :
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ISBN 13 :
Total Pages : 526 pages
Book Rating : 4.3/5 (91 download)
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1997 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 718 pages
Book Rating : 4.E/5 ( download)
Download or read book Proceedings of the 2002 ASME Joint U.S.-European Fluids Engineering Conference written by and published by . This book was released on 2002 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation This is the first of two volumes representing the proceedings of the July 2002 conference, and it is itself in two volumes (parts A & B). Approximately 400 papers discuss analysis, numerical methods, experiments in single-phase and multiphase flows, and applications. Topics include high speed jet flows; fluid measurement, instrumentation and machinery; cavitation and multiphase flow; advances in free surface and interface fluid dynamics; CFD applications in large facilities and in automotive flows; turbulent, vehicular, unsteady, three-dimensional, and environmental flows; supersonic flows in shock waves; fluidics; advances in fluids engineering education; flow instabilities and control; fundamentals and industrial applications; and wavelet application in fluid mechanics. There is no subject index. Annotation c. Book News, Inc., Portland, OR (booknews.com).
Author : S. Menon
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (11 download)
Download or read book Simulations of Ramjet Combustor Flow Fields written by S. Menon and published by . This book was released on 1987 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 630 pages
Book Rating : 4.0/5 ( download)
Download or read book 31st AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit written by and published by . This book was released on 1995 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : American Institute of Aeronautics and Astronautics. Technical Information Service
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ISBN 13 :
Total Pages : 764 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Finding Guide to AIAA Meeting Papers written by American Institute of Aeronautics and Astronautics. Technical Information Service and published by . This book was released on 1981 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kazhikathra Kailasanath
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (227 download)
Download or read book Numerical Simulations of Flowfields in a Central-Dump Ramjet Combustor. 3. Effects of Chemistry written by Kazhikathra Kailasanath and published by . This book was released on 1990 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is the third in a series which presents the results of numerical simulations performed to isolate and study acoustic-vortex-chemical interactions in an idealized ramjet consisting of an axisymmetric inlet and combustor and a choked nozzle. Both reactive and nonreactive flows have been simulated. The nonreactive flow calculations show complex interactions among the natural instability frequency of the shear layer at the inlet-combustor junction and the acoustics of both the inlet and the combustor. The entire flow oscillates at a low frequency which corresponds to that of a quarter-mode in the inlet. For the reactive flow cases studied, energy release alters the flow field substantially. Energy release in a large vortex is in phase with the pressure oscillation over a substantial region of the combustor and results in the observed amplification of the low-frequency oscillations and leads to combustion instability. The large pressure oscillation also modifies the vortex shedding process. Keywords: Ramjet, Turbulence, Combustion instability. (jes).
Author : Long Vu
Publisher :
ISBN 13 :
Total Pages : 87 pages
Book Rating : 4.:/5 (132 download)
Download or read book Quasi-one-dimensional Scramjet Combustor Flow Solver Using the Numerical Propulsion System Simulation written by Long Vu and published by . This book was released on 2019 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flow field inside a scramjet engine combustor involves complex phenomena such as fuel-air mixing, combustion chemistry, and flow separation. In order to determine the properties of the flow along the length of the combustor, mass, momentum and energy balance equations are solved simultaneously using a numerical method. While a full three dimensional computational simulation gives detailed results with high order of accuracy, it demands a great amount of time and computational resource. A low order analysis produces a fast overall picture of the combustor operation which in turn provides valuable information suitable for the preliminary design process. This research work aims to describe the analysis process of the scramjet combustor in which a quasi-one-dimensional, multi-species, reacting real gas model of the flow is developed to address the limitations in previous researches. The Numerical Propulsion System Simulation (NPSS), into which the NASA Chemical Equilibrium with Applications (CEA) code is integrated, is utilized as the platform to perform the analysis. The analytical model is validated by comparison with experimental data from previous researches. The results obtained by this method are expected to shed some light on the advantages of using detailed chemistry with lower order analysis to calculate scramjet engine performance.
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ISBN 13 :
Total Pages : 35 pages
Book Rating : 4.:/5 (227 download)
Download or read book Numerical Simulations of the Flowfield in a Central-Dump Ramjet Combustor. 1. Tests of the Model and Effects of Forcing written by and published by . This book was released on 1986 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents results of numerical simulations of the cold flow in a central dump ramjet combustor. Tests of the boundary conditions and numerical resolutions are used to perform the simulations. The simulations are used to isolate and study the interaction between acoustic waves and large scale vortex structures. A strong coupling between the acoustic modes of the chamber and large scale vortex structures is observed. The results in the early part of the calculations indicate unforced natural vortex growth near the entrance to the combustor (dump plane) at a frequency close to that of the first longitudinal acoustic mode. With time, the acoustic modes shift the frequency of the most amplified vortex rollup mode near the dump plane into resonance with the acoustic mode. The simulations indicate that the location in space where the modes grow can also be shifted by acoustic forcing. An interesting feature observed in the simulations is a low frequency mode corresponding to the arrival of the merged vortex structures at the choked exit. This mode causes major changes in the merging pattern of the vortices.
Author : Warren H. Harch
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.3/5 (91 download)
Download or read book Numerical Modelling of Ramjet Combustors written by Warren H. Harch and published by . This book was released on 1983 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work deals with development of computer codes for modelling of gas turbine combustors to ramjet combustor configurations. In particular, the STARPIC code of Lilley and Rhode has been expanded to include reacting compressible flows. (Author).
Author : M. S. Raju
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (43 download)
Download or read book Computational Fluid Dynamic Studies of Certain Ducted Bluff-Body Flowfields Relevant to Turbojet Combustors. Volume 2. Time-Averaged Flowfield Predictions for a Proposed Centerbody Combustor written by M. S. Raju and published by . This book was released on 1986 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The near-wake region in a ducted bluff-body combustor was investigated by finite-difference computations. The numerical predictions are based upon the time-independent, Reynolds-averaged Navier-Stokes equations and the k-epsilon turbulence model. The steady-state calculations address both nonreacting and reacting flowfields in a novel configuration to more realistically simulate some of the essential features of the primary zone of a gas turbine combustion chamber. This configuration is characterized by turbulent mixing and combustion in the recirculating near-wake region downstream of an axisymmetric bluff body due to two annular air streams--an outer swirl-free flow and an inner swirling flow--and a central fuel jet. The latter contains propane for reacting flows and carbon dioxide for nonreacting flows. In view of the large number of geometrical and flow parameters involved, the reported results are concerned with only a limited parametric examination with the major emphasis being on nonreacting flows. Questions addressed for a particular set of geometric parameters include the effects of variation of mass flow rates in all three streams and the influence of swirl in the middle stream. Reacting computations investigate the influence of swirl on combustion, as well as that of combustion on the flowfield. A careful consideration of the computed results of selected flow variables in terms of the global flowfield features, axial variations along the axis of symmetry, and radial profiles at different axial stations examines the implications of the present predictions and provides possible directions for ascertaining the validity of these predictions through future diagnostic measurements.
Author :
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ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (939 download)
Download or read book A Computational Study of a Dual-mode Ramjet Combustor with a Cavity Flameholder written by and published by . This book was released on 2012 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Andrew B. Freeborn
Publisher :
ISBN 13 :
Total Pages : 370 pages
Book Rating : 4.:/5 (318 download)
Download or read book Pylon Effects on a Scramjet Cavity Flameholder Flowfield written by Andrew B. Freeborn and published by . This book was released on 2008 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S. N. Tiwari
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Study of Dual-mode Flowfield in Scramjet Combustor written by S. N. Tiwari and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
