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Impingement Tones Of Large Aspect Ratio Supersonic Rectangular Jets
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Book Synopsis Impingement Tones of Large Aspect Ratio Supersonic Rectangular Jets by : Christopher K. W. Tam
Download or read book Impingement Tones of Large Aspect Ratio Supersonic Rectangular Jets written by Christopher K. W. Tam and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 90-3972 to 90-3993 written by and published by . This book was released on 1990 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Study of Supersonic Axisymmetric and Rectangular Jet Impingement Using Particle Image Velocimetry by : Vasilije J. Jovanovic
Download or read book The Study of Supersonic Axisymmetric and Rectangular Jet Impingement Using Particle Image Velocimetry written by Vasilije J. Jovanovic and published by . This book was released on 2003 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Journal of the Acoustical Society of America by : Acoustical Society of America
Download or read book The Journal of the Acoustical Society of America written by Acoustical Society of America and published by . This book was released on 2002 with total page 1196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 15th AIAA Aeroacoustics Conference: 93-4355 - 93-4400 by :
Download or read book 15th AIAA Aeroacoustics Conference: 93-4355 - 93-4400 written by and published by . This book was released on 1993 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure of a Supersonic Impinging Rectangular Jet Via Real-time Optical Diagnostics by : B. Thurow
Download or read book Structure of a Supersonic Impinging Rectangular Jet Via Real-time Optical Diagnostics written by B. Thurow and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Characterization of Supersonic Dual Impinging Jet Flows by : Vikas Nataraj Bhargav
Download or read book Experimental Characterization of Supersonic Dual Impinging Jet Flows written by Vikas Nataraj Bhargav and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impinging jet flowfield observed during take-off and landing of a STOVL aircraft is known to be associated with several adverse effects such as strong acoustic emission, unsteady structural loads, loss of engine efficiency due to hot gas ingestion, thermal stresses on the deck surface, and loss of lift. This flowfield has been well studied from the standpoint of characterizing the induced lift forces and moments caused by fountain flows, unique to such a flowfield. However, in the scenario of two such jets operating in tandem where properties are influenced by jet-jet interaction and coupling, are relatively unknown. Also, there is a lack of understanding of the consequences of difference in the momentum-flux and temperature of the two jets on the flow and acoustic properties. Therefore, the fundamental goal of this study is to systematically assess how different parameters such as momentum-flux and temperature affect the flow and acoustic properties of supersonic dual impinging jets. Thus, the three objectives of this study are: (1) How are the characteristics of supersonic dual impinging jets different from those of a supersonic single impinging jet? (2) What is the effect of relative momentum-flux between the two jets, on the aeroacoustic characteristics of supersonic dual impinging jets? (3) What is the effect of relative temperature, on the aeroacoustic characteristics of supersonic dual impinging jets? To address the first objective, experimental investigation of the flowfield associated with two, under-expanded impinging jets operating at a Nozzle Pressure Ratio (NPR) of 2.65, discharged from identical converging nozzles with an exit diameter of 25.4 mm, is performed. Comparisons with a single impinging jet, operating at the same conditions are provided through shadowgraph flow visualizations, nearfield acoustics, and surface pressure measurements. Fountain flow produced by the interaction of wall jets, a unique feature of dual impinging jets, is found to be relatively strong at short impingement heights and contributed to additional loads on the ground surface. Overall flow unsteadiness in dual jets is less than that in a single jet at conditions involving resonance and the fountain upwash plays an important role in the process. Although the feedback mechanism that drives the resonance in both impinging jet configurations is similar and the corresponding instability mode shapes are retained, there are differences in the strengths of the instability modes between the two configurations. To address the second objective, flowfield is characterized by systematically varying the relative jet momentum-flux between the jets. A converging and converging-diverging (CD) nozzle pair, with identical throat and exit diameters, respectively, is employed during the study. The CD (right) nozzle is held at a fixed over-expanded nozzle pressure ratio (NPR) of 3, and the momentum flux of jet from converging (left) nozzle is varied by changing its expansion ratio (ER). Schlieren flow visualization and ground plane surface pressure measurements indicate that the fountain flow position and strength exhibit a strong dependence on the jet momentum flux and a weak dependence on the impingement height. Further, an increase in momentum of the left jet causes the resonance in the right jet to lose its strength and its influence on the unsteadiness of the left jet, owed to the proximity of the fountain flow to the resonating jet. The presence of fountain upwash is found to alter the symmetry of streamlines, shear layer growth characteristics, and turbulent kinetic energy of the right jet. Under certain conditions, the fountain is close enough to significantly interact with the right jet and change the characteristics of the inner shear layer. Thereby, the processes constituting the feedback mechanism are notably altered and culminates in a weaker resonance. To address the third objective, the flowfield is characterized by systematically varying the relative jet temperature between the jets by increasing the temperature of only one of the jets (right). The NPR of the two jets are held fixed at conditions same as those used for the second objective. Qualitative visualization of the flowfield suggests that the left jet and fountain regions remain nearly unaffected by the right jet temperature. However, a corresponding increase in the jet velocity occurs in the right jet. Both the fountain position and its strength are independent of relative jet temperature and a strong function of the jet momentum flux. The increase in jet temperature also results in additional noise in the nearfield and increased unsteadiness on the impingement surface, although the latter is limited to short impingement heights and the region close to the right jet. At higher temperatures, short impingement heights are found to be more susceptible to resonance, with the chief source of resonance originating in the heated jet. At a fixed impingement height, while the jet instability mode shapes are retained, the corresponding impingement tones in the heated jet experience a systematic increment in frequency with rise in temperature. A detailed study of the velocity field suggest that, for a pair of jets at a given relative jet momentum flux, their fountain upwash could contribute to increased unsteadiness in the region around the nozzle (under-surface of the aircraft) at higher jet temperatures. The present experimental study significantly enhances the understanding of the impinging jet flowfield and its associated impacts on the parent aircraft, noise field and nearby structures. From an engineering standpoint, the results from this study will help inform aerodynamicists and structural engineers about the consequences of multi-jet-impingement configurations in STOVL applications. This is done through a systematic characterization of several parameters, which would provide the design guidelines. The three key findings of this study are: (1) Dual impinging jet flow and acoustic fields are strongly influenced by the fountain flow; (2) Fountain strength and placement relative to the jets, plays an important role in influencing the ground induced adverse effects. This in turn depends on the momentum of the jets; (3) Jet temperature can also worsen these effects, although this is a weaker factor than jet momentum From a scientific stand point, the results from this study provide a high fidelity database for the validation of numerical tools on dual impinging jet configuration. Furthermore, the present study provides the baseline data to help study flow and noise control techniques for dual impinging jets.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1997 with total page 940 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhanced Mixing of a Rectangular Supersonic Jet by Natural and Induced Screech by : Edward J. Rice
Download or read book Enhanced Mixing of a Rectangular Supersonic Jet by Natural and Induced Screech written by Edward J. Rice and published by . This book was released on 1993 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Journal of Turbo & Jet-engines by :
Download or read book International Journal of Turbo & Jet-engines written by and published by . This book was released on 1998 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Resonant Interaction of a Linear Array of Supersonic Rectangular Jets: An Experimental Study by : Ganesh Raman
Download or read book Resonant Interaction of a Linear Array of Supersonic Rectangular Jets: An Experimental Study written by Ganesh Raman and published by . This book was released on 1994 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :American Institute of Aeronautics and Astronautics. Technical Information Service Publisher : ISBN 13 : Total Pages :184 pages Book Rating :4.3/5 (91 download)
Book Synopsis The Finding Guide to AIAA Meeting Papers by : American Institute of Aeronautics and Astronautics. Technical Information Service
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 1996 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Supersonic Jets from Bevelled Rectangular Nozzles by :
Download or read book Supersonic Jets from Bevelled Rectangular Nozzles written by and published by . This book was released on 1993 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Normal Force on Low Aspect Ratio, Rectangular Fin-body Combinations at Supersonic Speeds and High Angles of Attack by : James Robert Burt
Download or read book Normal Force on Low Aspect Ratio, Rectangular Fin-body Combinations at Supersonic Speeds and High Angles of Attack written by James Robert Burt and published by . This book was released on 1969 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781792775833 Total Pages :28 pages Book Rating :4.7/5 (758 download)
Book Synopsis Screech Tones of Supersonic Jets from Bevelled Rectangular Nozzles by : National Aeronautics and Space Adm Nasa
Download or read book Screech Tones of Supersonic Jets from Bevelled Rectangular Nozzles written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-29 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is known experimentally that an imperfectly expanded rectangular jet from a thin-lip convergent nozzle emits only a single dominant screech tone. The frequency of the screech tone decreases continuously with increase in jet Mach number. However, for a supersonic jet issued from a bevelled nozzle or a convergent-divergent nozzle with straight side walls, the shock cell structure and the screech frequency pattern are fairly complicated and have not been predicted before. In this paper, it is shown that the shock cell structures of these jets can be decomposed into waveguide modes of the jet flow. The screech frequencies are related to the higher-order waveguide modes following the weakest-link screech tone theory. The measured screech frequencies are found to compare well with the predicted screech frequency curves. Tam, Christopher K. W. and Shen, Hao and Raman, Ganesh Langley Research Center NASA-CR-205131, AIAA Paper 95-0143, NAS 1.26:205131 NAG1-1776...
Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1991 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: