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Computations Of Three Dimensional Unsteady Supersonic Cavity Flow To Study The Effect Of Different Downstream Geometries
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Book Synopsis Computations of Three-Dimensional Unsteady Supersonic Cavity Flow to Study the Effect of Different Downstream Geometries by : B. I. Soemarwoto
Download or read book Computations of Three-Dimensional Unsteady Supersonic Cavity Flow to Study the Effect of Different Downstream Geometries written by B. I. Soemarwoto and published by . This book was released on 2003 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computations of three-dimensional unsteady supersonic cavity flow are performed for a free-stream Mach number of 1.2. Two cavity geometries are considered: (i) a simple rectangular cavity of length-to-depth (L/D) and length-to-width (L/W) ratios of 4.5, and (ii) a cavity with a 450 ramp attached to the downstream wall of the simple rectangular cavity. Two flow models for computing the cavity flow field are assessed: (a) the Reynolds-Averaged Navier-Stokes (RANS) equations with a kappa-omega- turbulence model for the whole flow field, and (b) a combination of an inviscid flow model using the Euler equations for the domain outside the boundary layer and the RANS model for the boundary layer. The structures of the flow fields resulting from the different models are observed. The effect of the different downstream geometries is assessed.
Book Synopsis Computations of Three-dimensional Unsteady Supersonic Cavity Flow to Study the Effect of Different Downstream Geometries by : B. I. Soemarwoto
Download or read book Computations of Three-dimensional Unsteady Supersonic Cavity Flow to Study the Effect of Different Downstream Geometries written by B. I. Soemarwoto and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computations of Three-dimensional Unstrady Suspersonic Cavity Flow to Study the Effect of Different Downstream Geometries by : B. I. Soemarwoto
Download or read book Computations of Three-dimensional Unstrady Suspersonic Cavity Flow to Study the Effect of Different Downstream Geometries written by B. I. Soemarwoto and published by . This book was released on 2001 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Three-Dimensional Freestream Disturbances on the Supersonic Flow Past a Wedge by : Peter W. Duck
Download or read book The Effect of Three-Dimensional Freestream Disturbances on the Supersonic Flow Past a Wedge written by Peter W. Duck and published by . This book was released on 1997 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction between a shock wave (attached to a wedge) and small amplitude, three-dimensional disturbances of a uniform, supersonic, freestream flow are investigated. The paper extends the two-dimensional study of Duck et al(1), through the use of vector potentials, which render the problem tractable by the same techniques as in the two-dimensional case, in particular by expansion of the solution by means of a Fourier-Bessel series, in appropriately chosen coordinates. Results are presented for specific classes of freestream disturbances, and the study shows conclusively that the shock is stable to all classes of disturbances (i.e. time periodic perturbations to the shock do not grow downstream), provided the flow downstream of the shock is supersonic (loosely corresponding to the weak shock solution). This is shown from our numerical results and also by asymptotic analysis of the Fourier-Bessel series, valid far downstream of the shock.
Book Synopsis The Calculation of Three-dimensional Supersonic Flows Around Spherically-capped Smooth Bodies and Wings: Theory and applications by : Chong-Wei Chu
Download or read book The Calculation of Three-dimensional Supersonic Flows Around Spherically-capped Smooth Bodies and Wings: Theory and applications written by Chong-Wei Chu and published by . This book was released on 1972 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computation of Supersonic Flow over Flying Configurations by : Adriana Nastase
Download or read book Computation of Supersonic Flow over Flying Configurations written by Adriana Nastase and published by Elsevier. This book was released on 2010-07-07 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computation of Supersonic Flow over Flying Configurations is a high-level aerospace reference book that will be useful for undergraduate and graduate students of engineering, applied mathematics and physics. The author provides solutions for three-dimensional compressible Navier-Stokes layer subsonic and supersonic flows. Computational work and experimental results show the real-world application of computational results Easy computation and visualization of inviscid and viscous aerodynamic characteristics of flying configurations Includes a fully optimized and integrated design for a proposed supersonic transport aircraft
Book Synopsis The Calculation of Three-dimensional Supersonic Flows Around Spherically-capped Smooth Bodies and Wings: Manual for computer programs by : Chong-Wei Chu
Download or read book The Calculation of Three-dimensional Supersonic Flows Around Spherically-capped Smooth Bodies and Wings: Manual for computer programs written by Chong-Wei Chu and published by . This book was released on 1972 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental and Computational Study of Unsteady Supersonic 2-D Open Cavity Flow Physics by : Douglas W. Dusing
Download or read book An Experimental and Computational Study of Unsteady Supersonic 2-D Open Cavity Flow Physics written by Douglas W. Dusing and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Supersonic Flow and Its Control Over Highly Three-dimensional Cavities by : Michael Vincent Sheehan
Download or read book Supersonic Flow and Its Control Over Highly Three-dimensional Cavities written by Michael Vincent Sheehan and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: To accomplish this goal, two additional models were constructed each having only one of the additional geometrical features, either diverging side walls or the ramp floor. Subsequently it was determined that biggest impact on changing the cavity acoustics came from the diverging side walls of the complex cavity. In addition to testing the effect of cavity geometry, a microjet control technique was adapted to reduce the pressure loads within the highly three-dimensional cavity. An array consisting of eight 400micrometer diameter jets was used, and with minimal mass flow, reductions of both the tonal amplitudes and broadband levels was possible. Along with testing on the very small scale, experiments were conducted with the same complex geometry nearly 10 times larger. Two major results were found: first the baseline, no control, acoustics of both the large and small models were found to scale quite well, moreover the microjet control technique was found to be similarly effective one the larger scale but with better efficiency. These results give good confidence that the aero-acoustic characteristics on a very small scale, as presented in this research, can be used to accurately model full scale applications, and the further development of cavity control techniques.
Book Synopsis Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds by : Maureen B. Tracy
Download or read book Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds written by Maureen B. Tracy and published by . This book was released on 1997 with total page 84 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 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722860233 Total Pages :32 pages Book Rating :4.8/5 (62 download)
Book Synopsis The Effect of Three-Dimensional Freestream Disturbances on the Supersonic Flow Past a Wedge by : National Aeronautics and Space Administration (NASA)
Download or read book The Effect of Three-Dimensional Freestream Disturbances on the Supersonic Flow Past a Wedge written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-13 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction between a shock wave (attached to a wedge) and small amplitude, three-dimensional disturbances of a uniform, supersonic, freestream flow are investigated. The paper extends the two-dimensional study of Duck et al, through the use of vector potentials, which render the problem tractable by the same techniques as in the two-dimensional case, in particular by expansion of the solution by means of a Fourier-Bessel series, in appropriately chosen coordinates. Results are presented for specific classes of freestream disturbances, and the study shows conclusively that the shock is stable to all classes of disturbances (i.e. time periodic perturbations to the shock do not grow downstream), provided the flow downstream of the shock is supersonic (loosely corresponding to the weak shock solution). This is shown from our numerical results and also by asymptotic analysis of the Fourier-Bessel series, valid far downstream of the shock. Duck, Peter W. and Lasseigne, D. Glenn and Hussaini, M. Y. Langley Research Center NAS1-19480; RTOP 505-90-52-01...
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1974 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Computational Study of Driven Micro-cavities in Supersonic Flat Plate Flow by : Thomas Ryan Rehmeier
Download or read book A Computational Study of Driven Micro-cavities in Supersonic Flat Plate Flow written by Thomas Ryan Rehmeier and published by . This book was released on 2013 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Driven micro-cavities embedded in the wall beneath turbulent supersonic boundary layers are analyzed using two-dimensional computational fluid dynamics. This concept is a passive flow control technique in which very small cavities formed by arrays of thin vertical walls are oriented transverse to the flow direction and underlie the boundary layer. The purpose is to reduce or eliminate skin friction drag. Various micro-cavity configurations were analyzed at locations (0.1 m and 1 m) downstream of the leading edges of flat plates, for free-stream Mach numbers of 1.2, 2.0, and 3.0. Results focus on net drag reduction achieved, cavity flow-field effects, perforation effects in vertical cavity walls, cavity scale effects, mesh refinement issues, and the stability of the solutions. Skin friction drag was eliminated over micro-cavity regions for all configurations tested. Drag in these regions was due to pressure effects on vertical walls and exhibited a linear increase with downstream distance. Drag reductions as high as 18-20% (compared to a reference flat plate section) were obtained for 52-cavity geometries at Mach 2.0 and Mach 3.0 downstream of the 10 cm and 1 m flat plates, respectively. Perforation of the cavity walls showed no effect on net drag reduction for these cases. Stability issues were observed when using a fine grid mesh for the Mach 2.0 case, with significant oscillations seen in the drag. A parametric investigation in which cavity scale, number, and wall configuration were varied was also performed for two free-stream Mach numbers of 1.2 and 3.0. Drag reductions between 18-40% were seen for these cases. It is shown that drag reduction was reduced with increasing cavity length and that the steadiness of the solution increases with the number of vertical cavity walls present"--Abstract, page iii.
Book Synopsis Experimental Investigation of Supersonic Cavity Flows and Their Control by : Ning Zhuang
Download or read book Experimental Investigation of Supersonic Cavity Flows and Their Control written by Ning Zhuang and published by . This book was released on 2007 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of supersonic cavity flows is of interest both from fundamental fluid dynamics and practical perspectives. The complex nature of this flowfield, consisting of compressible shear layers, compression/expansion waves, and fluid-acoustic interactions, makes it a rich problem to study. A detailed experimental study of supersonic flow (M=1.5 to 2) over a range of three-dimensional rectangular cavities (L/D=1 to 5.2) was conducted. The measurements included unsteady surface pressure measurements, particle image velocimetry, and flow visualization using shadowgraph and schlieren. Large-scale structures in the shear layer and a large recirculation zone in the cavity was observed. Spatial and temporal mode switching was also observed, the nature being different for short and long cavities. The shear layer characteristics of the two cavities are very different in term of curvature and growth. Supersonic microjets were used at the leading edge of the cavities to suppress the resonance in the flow. With a minimal mass flux (0.15%), the activation of microjets led to a large reduction in cavity tones (20 dB) and overall sound pressure levels (9dB). In addition, the microjet injection enhanced the shear layer mixing and reduced the velocity fluctuation in the cavities. The significant reductions together with the low mass flux requirements make this a potentially viable technique for full-scale, practical applications.
Book Synopsis Analysis of the Three-dimensional Compressible Turbulent Boundary Layer on a Sharp Cone at Incidence in Supersonic and Hypersonic Flow by : John C. Adams
Download or read book Analysis of the Three-dimensional Compressible Turbulent Boundary Layer on a Sharp Cone at Incidence in Supersonic and Hypersonic Flow written by John C. Adams and published by . This book was released on 1972 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytical approach toward numerical calculation of the three-dimensional turbulent boundary layer on a sharp cone at incidence under supersonic and hypersonic flow conditions is presented. The theoretical model is based on implicit finite-difference integration of the governing three-dimensional turbulent boundary-layer equations in conjunction with a three-dimensional scalar eddy-viscosity model of turbulence. Comparison is made of present theory with detailed experimental measurements of the three-dimensional turbulent boundary-layer structure (velocity and temperature profiles), the surface streamline direction (obtained via an oil-flow technique) and surface heat-transfer rate.
Book Synopsis Calculation of Three-dimensional, Inviscid Supersonic, Steady Flows by : Gino Moretti
Download or read book Calculation of Three-dimensional, Inviscid Supersonic, Steady Flows written by Gino Moretti and published by . This book was released on 1982 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
