3 edition of Acoustic receptivity of compressible boundary layers found in the catalog.
Acoustic receptivity of compressible boundary layers
by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va
Written in English
|Series||NASA contractor report -- 4599., NASA contractor report -- NASA CR-4599.|
|Contributions||Langley Research Center.|
|The Physical Object|
The Turbulent Boundary Layer in Compressible Flow W. F. CoP~, M.A., E., of the Engineering Division, N.P.L. Reports and Memoranda No. 28¢o* November, SummaryThe flow of a compressible gas past a fiat plate is investigated for a turbulent boundary layer. TheFile Size: KB. The character of Toulouse was also different in that 3-D boundary layers, numerical simulations, streamwise vortices, and foundation papers on receptivity were presented. Sendai saw a number of papers on swept wings and 3-D boundary layers. Numerical simulations attacked a broader range of problems.
A deeper understanding of the different factors that influence the laminar-turbulent transition in supersonic boundary layers will help the design of efficient high-speed vehicles. In this work we study the effects of surface roughness on the stability and transition to turbulence of supersonic boundary layers. The investigation is carried out by direct numerical simulations (DNS) of the Cited by: 3. Receptivity and Bypass Dynamics.- Study of 3D Wall Roughness Acoustic Receptivity on an Airfoil.- Experiments on Receptivity, Stability, and Transition of 2-D Laminar Boundary Layers with Streamwise Pressure Gradients.- Leading-Edge Acoustic Receptivity Measurements Using a Pulsed-Sound Technique
A new edition of the almost legendary textbook by Schlichting completely revised by Klaus Gersten is now available. This book presents a comprehensive overview of boundary-layer theory and its application to all areas of fluid mechanics, with emphasis on the flow past bodies (e.g. aircraft aerodynamics)/5. The receptivity of boundary layers on blunt bodies to oscillations in the free stream / Similarity solutions for small cross flows in laminar compressible boundary layers, ([Washington, U.S. G.P.O.], Analysis of an existing experiment on the interaction of acoustic waves with a laminar boundary layer / (Washington.
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Acoustic Receptivity of Compressible Boundary Layers: Receptivity via Surface - Temperature Variations [M. Chaudhari] on *FREE* shipping on qualifying offers. Get this from a library. Acoustic receptivity of compressible boundary layers: receptivity via surface-temperature variations. [Meelan Choudhari; Langley Research Center.].
boundary layers. The investigations can be divided into two groups. The first group concerns the forced response of parallel and non-parallel boundary layers to freestream acoustic disturbances.2 - 5 In these studies, it was found that acoustic waves excite disturbances inside the boundary layer that are much larger than those in the freestream.
Receptivity of compressible boundary layers to three-dimensional perturbations at the wall is solved with the help of the biorthogonal eigenfunction system. The method allows computation of normal mode amplitudes of the discrete and continuous by: Acoustic Receptivity of Mach Boundary Layer with Leading-Edge Bluntness Abstract Boundary layer receptivity to two-dimensional slow and fast acoustic waves is investigated by solving Navier-Stokes equations for Mach flow over a flat plate with a finite-thickness leading edge.
Higher order spatial and temporal schemes are employed. The results show that the receptivity mechanisms of the second mode are very different from those of modes I and II, which leads to very different receptivity properties of these discrete wave modes to free-stream fast acoustic waves with different incident wave angles, frequencies, and different wall boundary by: Barone, M.
Receptivity of compressible mixing layers. PhD thesis, Department of Aeronautics and Astronautics, Stanford University. Bechert, D. Author: Sanjiva K. Lele. to a wide class of problems concerning the compressible laminar boundary layer on rotating axisymmetric bodies.
Part II Both Sections of Part II deal with "similar" solutions of the compressible boundary layer equations when the Prandtl number is one and the coefficient of viscosity is proportional to the absolute temperature. The near field of the adjoint solution reveals regions of relatively high receptivity to direct forcing within the mixing layer, with receptivity to nearby acoustic sources depending on the source type and position.
Receptivity 'nodes' are present at certain locations near the splitter plate edge where the flow is not sensitive to forcing. Receptivity of supersonic boundary layer to acoustic disturbances interacting with a blunt leading edge of a flat plate is studied using a combined asymptotic and numerical approach.
Abstract. In this paper, we examine the acoustic receptivity of a laminar boundary layer with an isolated 3-D surface roughness.
Stimulus-response experiments are conducted to quantify the coupling between artificial acoustic excitation and Tollmein-Schlichting instabilities in a Blasius boundary by: 6. Acoustic Receptivity of Mach Boundary Layer with Leading-Edge Bluntness [Nasa Technical Reports Server (Ntrs)] on *FREE* shipping on qualifying offers.
Acoustic Receptivity of Mach Boundary Layer with Leading-Edge Bluntness. This chapter is a review of the receptivity and resulting global instability of boundary layers due to free-stream vortical and acoustic disturbances at subsonic and moderately supersonic Mach numbers.
The vortical disturbances produce an unsteady boundary layer flow that develops into oblique instability waves with a viscous triple-deck structure in the downstream : Marvin E. Goldstein, Pierre Ricco.
Towards Nuclear Zero by David Cortright & Raimo Vayrynen and a great selection of related books, art and collectibles available now at Tumin, A. b Receptivity of compressible boundary layers to three-dimensional wall perturbations. AIAA Paper Tumin, A. & Aizatulin, L. Instability and receptivity of laminar wall by: Boundary layer receptivity to two-dimensional slow and fast acoustic waves is investigated by solving Navier–Stokes equations for Mach flow over a flat plate with a finite-thickness leading edge.
Higher order spatial and temporal schemes are employed to obtain the solution whereby the flat-plate leading edge region is resolved by providing a sufficiently Cited by: Laminar boundary layers can be loosely classified according to their structure and the circumstances under which they are created.
The thin shear layer which develops on an oscillating body is an example of a Stokes boundary layer, while the Blasius boundary layer refers to the well-known similarity solution near an attached flat plate held in an oncoming.
Receptivity and Bypass Dynamics.- Study of 3D Wall Roughness Acoustic Receptivity on an Airfoil.- Experiments on Receptivity, Stability, and Transition of 2-D Laminar Boundary Layers with Streamwise Pressure Gradients.- Leading-Edge Acoustic Receptivity Measurements Using a Pulsed-Sound Technique.-Price: $ boundary layers 67 Paper 2.
Spatial optimal growth in three-dimensional compressible boundary layers Paper 3. Swept-wing boundary-layer receptivity to localised surface roughness Paper 4.
Swept-wing boundary-layer receptivity Paper 5. Stabilisation of a swept-wing boundary layer by surface roughness x.
second receptivity mechanism proved to be eﬃcient. Receptivity of three-dimensional boundary layers Three-dimensional boundary layers can be found on swept wings or blades and are therefore of importance in aeronautics and turbomachinery.
In particular, the ﬂow over a swept ﬂat plate subject to a chordwise pressure gradient has often. Keywords — compressible boundary layers, acoustic field, laminar-turbulent transition, hydrodynamic stability. I. INTRODUCTION. The questions on the interaction of a supersonic boundary layer with acoustic waves which are considered in the present paper were raised mainly in connection with the problem on the turbulence formation.
In this post I go over the numerical solution to the compressible boundary layer equations. This is very useful when a quick estimate of shear stress, wall heat flux, or boundary layer height if necessary. The sections of this post are: Introduction Compressibility transformation Using the general parabolic form Numerical solution using Crank-Nicolson Results and.
The basic problems of transition in both incompressible and compressible boundary layers are reviewed. Flow structures in low-speed transitional and developed turbulent boundary layers are presented, together with almost all of the physical mechanisms that have been proposed for their formation.