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Author : I-Shih Chang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Unsteady-state Underexpanded Jet Flows written by I-Shih Chang and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ibraheem M. A. Al-Qadi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (588 download)
Download or read book Three-dimensional Numerical Simulation of a Supersonic Under-expanded Rectangular Jet written by Ibraheem M. A. Al-Qadi and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: A three-dimensional numerical simulation of the unsteady flow in an under-expanded supersonic rectangular jet has been conducted for the purpose of investigating and analyzing the production and propagation of jet noise. The compressible three-dimensional Navier-Stokes equations are solved using high-order spatial and temporal differencing schemes. The solution method applies linear and nonlinear filtering schemes to produce oscillation-free shocks and discontinuities while minimizing dissipation effects in smooth regions. The solution method also applies nonreflecting boundary conditions to minimize reflections. Characteristic boundary conditions are implemented at the upstream and far-field boundaries and an absorbing buffer zone is added at the outflow boundary. OpenMP shared- memory model was utilized to parallelize the simulation and good parallel performance was achieved. The code was used to conduct a time dependent numerical simulation of an under-expanded supersonic rectangular jet. A comprehensive database of the simulation was generated. The results of the simulation were validated against experimental measurements and show very good agreement. The simulation is shown to resolve critical unsteady flow features of the jet such as vortex shedding, shock-cell structure, shock shear-layer interaction, flapping, and axis-switching. Visualization of the unsteady flow and analysis of the turbulent flow-field shows that the location of axis-switching is immediately downstream of the fourth shock. It is also observed that the location of the dominant screech source is at the third shock. Two-point space-time correlations demonstrate that the convection velocities in the jet shear layer are highly modulated by the presence of shock waves. Spectral analysis show that the simulation predicts, with good accuracy, screech modes frequencies, wavelengths, phase, and amplitudes. Analysis inside the jet shear layer and in the acoustic near-field reveal exact correspondence in frequency and phase between the inner and the outer parts of the screech loop. The simulation also predicts the complex pattern of the near acoustic field associated with screech. The current simulation represents the first successful three- dimensional numerical simulation of an under-expanded supersonic rectangular jet. It also represents a significant contribution towards accurate prediction of noise production and far-field radiation in supersonic jets. The computational tools developed in this study can be used to investigate a wide range of problems related to unsteady flows and aeroacoustics.
Author :
Publisher :
ISBN 13 :
Total Pages : 710 pages
Book Rating : 4.0/5 ( download)
Download or read book 38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit: 02-3850 - 02-3899 written by and published by . This book was released on 2002 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : William James Sheeran
Publisher :
ISBN 13 :
Total Pages : 282 pages
Book Rating : 4.:/5 (169 download)
Download or read book Underexpanded, Two-dimensional Jet Flows written by William James Sheeran and published by . This book was released on 1966 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 300 pages
Book Rating : 4.:/5 (31 download)
Download or read book Experimental and Theoretical Studies of Axisymmetric Free Jets written by and published by . This book was released on 1959 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some experimental and theoretical studies have been made of axisymmetric free jets exhausting from sonic and supersonic nozzles into still air and into supersonic streams with a view toward problems associated with propulsive jets and the investigation of these problems. For jets exhausting into still air, consideration is given to the effects of jet Mach number, nozzle divergence angle, and jet static-pressure ratio upon jet structure, jet wavelength, and the shape and curvature of the jet boundary. Studies of the effects of the ratio of specific heats of the jets are included as are observations pertaining to jet noise and jet simulation. For jets exhausting into supersonic streams, an attempt has been made to present primarily theoretical curves of the type that may be useful in evaluating certain jet interference effects and in formulating experimental studies. The primary variables considered are jet Mach number, free-stream Mach number, jet static-pressure ratio, ratio of specific heats of the jet, nozzle exit angle, and boattail angle. The simulation problem and the case of a hypothetical hypersonic vehicle are examined. A few experimental observations are included.
Author :
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ISBN 13 :
Total Pages : 956 pages
Book Rating : 4.:/5 (319 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Richard John Jefferson-Loveday
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (52 download)
Download or read book Numerical Simulations of Unsteady Impinging Jet Flows written by Richard John Jefferson-Loveday and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nandkishore Menon
Publisher :
ISBN 13 :
Total Pages : 344 pages
Book Rating : 4.:/5 (775 download)
Download or read book Analysis of Non-axisymmetric Underexpanded Jet Flow Fields written by Nandkishore Menon and published by . This book was released on 2009 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jorge Arturo Ahumada Lazo
Publisher :
ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.:/5 (16 download)
Download or read book Experimental Study of Regions of Flow Recirculation in Underexpanded Supersonic Swirling Jets written by Jorge Arturo Ahumada Lazo and published by . This book was released on 2018 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flame-holding is accounted as one of the major challenges in scramjet engines. To increase residence time scales, flow recirculation is commonly introduced in the combustors by means of engine wall cavities or bluff-bodies. Either configuration involves the interaction of solid structures with high temperature gases, resulting in elevated heat transfer loads to the engine components. This study investigates the recirculation in supersonic jets caused by swirl as a flame-holding mechanism independent of solid structures. Swirl is imparted to the flow by tangential injection into a convergent nozzle, and a geometrical swirl number Sg is calculated to assess the swirling strength. Schlieren imaging and planar laser Mie scattering (PLMS) techniques are used to evaluate the shock cell structure, and planar particle image velocimetry (PIV) is implemented to characterize the regions of reversal flow. It is found that viscous effects inside the nozzle due to tangential injection become significant in reduced exit diameters and inhibit the formation of vortical recirculating structures. The configuration of inlets used for injection rather than geometrical swirl number alone proves to be deterministic for the onset of recirculation. In certain experimental configurations, Schlieren imaging reveals the existence of recirculating regions. A stagnation point results from impingement of the jet main stream and recirculation and acts as a standing body. It is suggested that a bow shock wave forms about this point. Mie scattering imaging proves entrainment of humidity from the jet shear layer in the form of particles that allow for PIV to be implemented. Jets with reversal are unstable and switch between reversing and non-reversing modes, recirculation structures also fluctuate in the radial and axial directions and even migrate downstream of the Mach disk. This induces further instability in the flow as the pressure distribution is unsteady. PIV analysis allows to obtain characteristic length and time scales based on the radius of recirculation and the characteristic reversal axial velocity. The time scales of the mode-switching phenomenon are evaluated by acquiring Schlieren images at a high frame rate. The non-recirculating mode is significantly suppressed by a moderate addition of axial flow.
Author :
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ISBN 13 :
Total Pages : 570 pages
Book Rating : 4.0/5 ( download)
Download or read book 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit 10-13 July 2005, Tucson, Arizona: 05-4350 - 05-4399 written by and published by . This book was released on 2005 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. Superintendent of Documents
Publisher :
ISBN 13 :
Total Pages : 1408 pages
Book Rating : 4.F/5 ( download)
Download or read book Monthly Catalog of United States Government Publications, Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1976 with total page 1408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 1388 pages
Book Rating : 4.3/5 (243 download)
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1971 with total page 1388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 580 pages
Book Rating : 4.F/5 ( download)
Download or read book Aeronautical Engineering written by and published by . This book was released on 1971 with total page 580 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)
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ISBN 13 :
Total Pages : 538 pages
Book Rating : 4.:/5 (26 download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1964 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. National Aeronautics and Space Administration
Publisher :
ISBN 13 :
Total Pages : 484 pages
Book Rating : 4.3/5 (126 download)
Download or read book Technical Publications Announcements with Indexes written by United States. National Aeronautics and Space Administration and published by . This book was released on 1962 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 1000 pages
Book Rating : 4.F/5 ( download)
Download or read book Government Reports Announcements written by and published by . This book was released on 1974 with total page 1000 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James E. A. John
Publisher : Prentice Hall
ISBN 13 :
Total Pages : 696 pages
Book Rating : 4.X/5 (4 download)
Download or read book Gas Dynamics written by James E. A. John and published by Prentice Hall. This book was released on 2006 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edition of a very successful and widely adopted book has been brought up-to-date with computer methods and applications throughout. It makes use of spreadsheet programs, and contains unique procedures that have never appeared before in any gas dynamics book. KEY TOPICS Chapter topics include basic equations of compressible flow., wave propagation in compressible media, isentropic flow of a perfect gas, stationary and moving normal shock waves, oblique shock waves, flow with friction and with heat addition or heat loss, equations of motion for multidimensional flow, methods of characteristics, special topics in gas dynamics, and measurement in compressible flow. For mechanical and aerospace engineers.
