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Author : Ten-See Wang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Numerical Study of Reactive Ramjet Dump Combustor Flowfields with a Pressure Base CFD Method written by Ten-See Wang and published by . This book was released on 1989 with total page 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 : Ann F. Whitaker
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ISBN 13 :
Total Pages : 686 pages
Book Rating : 4.:/5 (317 download)
Download or read book Aerospace Environmental Technology Conference written by Ann F. Whitaker and published by . This book was released on 1995 with total page 686 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 : 550 pages
Book Rating : 4.0/5 ( download)
Download or read book 32nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit written by and published by . This book was released on 1996 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 384 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA SP. written by and published by . This book was released on 1991 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 636 pages
Book Rating : 4.0/5 ( download)
Download or read book 93-2300 - 93-2349 written by and published by . This book was released on 1992 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. C. Dutt
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ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.:/5 (227 download)
Download or read book Fundamental Modelling of Reacting Flow in Ramjet Dump Combustors written by J. C. Dutt and published by . This book was released on 1980 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The calculated results based on the universal two-equation model known as k-epsilon model of turbulence for recirculating, reactive and non-reactive flows in dump combustors (12 in. ID) are presented extending the previous results obtained in this Department. The experimental data on the combustion efficiency, flow fields and recirculation zones for such combustors from the Air Force Aero Propulsion Laboratory, Ohio and the Arnold Engineering Development Centre, Tennessee have been compared with those predicted by the present modelling procedure and found to be in remarkably good agreement. (Author).
Author : Alison Anne Behrens
Publisher :
ISBN 13 :
Total Pages : 358 pages
Book Rating : 4.:/5 (319 download)
Download or read book Reacting Flow Studies in a Dump Combustor written by Alison Anne Behrens and published by . This book was released on 2007 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 622 pages
Book Rating : 4.0/5 ( download)
Download or read book 33rd Aerospace Sciences Meeting & Exhibit written by and published by . This book was released on 1995 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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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 :
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ISBN 13 :
Total Pages : 532 pages
Book Rating : 4.:/5 (317 download)
Download or read book Aeronautical Engineering: A Cumulative Index to a Continuing Bibliography (supplement 248) written by and published by . This book was released on 1990 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 702 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 712 pages
Book Rating : 4.F/5 ( download)
Download or read book Aeronautical Engineering written by and published by . This book was released on 1993 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA)
Author : Kenneth Hyupsang Yu
Publisher :
ISBN 13 :
Total Pages : 294 pages
Book Rating : 4.:/5 (7 download)
Download or read book Low Frequency Pressure Oscillations in a Model Ramjet Dump Combustor written by Kenneth Hyupsang Yu and published by . This book was released on 1989 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. S. Nejad
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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)
Download or read book Experimental Studies of Reactive and Non-reactive Flows in Dump Combustors written by A. S. Nejad and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this experimental program are two fold; first, to investigate, understand, and document the effects of heat release on the characteristics of a dump combustor flowfield; secondly, to provide a benchmark set of experimental data to aid the development of time averaged CFD codes. A limited number of velocity profiles are reported in this manuscript to illustrate the effects of combustion and heat release, at an equivalence ratio of 0.65, on dump combustor flows. High-speed photography and spectral analysis complemented velocity measurements and served to examine and characterize combustion instability limits. Results indicate that combustion altered the dump combustor flowfield and significantly reduced the length of the corner recirculation region.
Author : James E. Drewry
Publisher :
ISBN 13 :
Total Pages : 67 pages
Book Rating : 4.:/5 (227 download)
Download or read book Characterization of Sudden-Expansion Dump Combustor Flowfields written by James E. Drewry and published by . This book was released on 1976 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: Basic flowfield studies pertinent to an axisymmetric, sudden-expansion dump combustor have been performed under cold flow conditions. These studies have included surface flow visualization, pressure probing, and gas sampling within a representative combustor duct. Flow visualization tests, which were performed using a surface oil flow technique, graphically demonstrated the complex nature of the flow recirculation/reattachment region downstream of the dump station. Detailed measurements of wall static pressure, flow static pressure, and flow total pressure were made for the combustor flowfield. Gas concentration measurements of simulated fuel (argon)/air mixing were made in the combustor duct using a unique on-line, real-time gas sampling/analysis system. The results obtained from this particular research effort have provided additional insight into the complexities of dump combustor flowfields. (Author).
