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Effect Of Nonzero Surface Admittance On Receptivity And Stability Of Compressible Boundary Layer
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722191306 Total Pages :24 pages Book Rating :4.1/5 (913 download)
Book Synopsis Effect of Nonzero Surface Admittance on Receptivity and Stability of Compressible Boundary Layer by : National Aeronautics and Space Administration (NASA)
Download or read book Effect of Nonzero Surface Admittance on Receptivity and Stability of Compressible Boundary Layer written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of small-amplitude short-scale variations in surface admittance on the acoustic receptivity and stability of two-dimensional compressible boundary layers is examined. In the linearized limit, the two problems are shown to be related both physically and mathematically. This connection between the two problems is used, in conjunction with some previously reported receptivity results, to infer the modification of stability properties due to surface permeability. Numerical calculations are carried out for a self-similar flat-plate boundary layer at subsonic and low supersonic speeds. Variations in mean suction velocity at the perforated admittance surface can also induce receptivity to an acoustic wave. For a subsonic boundary layer, the dependence of admittance-induced receptivity on the acoustic-wave orientation is significantly different from that of the receptivity produced via mean suction variation. The admittance-induced receptivity is generally independent of the angle of acoustic incidence, except in a relatively narrow range of upstream-traveling waves for which the receptivity becomes weaker. However, this range of angles is precisely that for which the suction-induced receptivity tends to be large. At supersonic Mach numbers, the admittance-induced receptivity to slow acoustic models is relatively weaker than that in the case of the fast acoustic modes. We also find that purely real values for the surface admittance tend to have a destabilizing effect on the evolution of an instability wave over a slightly permeable surface. The limits on the validity of the linearized approximation are also assessed in one specific case. Choudhari, Meelan Unspecified Center NAS1-20059; RTOP 505-59-50-01...
Book Synopsis Effect of Nonzero Surface Admittance on Receptivity and Stability of Compressible Boundary Layer by : Meelan Choudhari
Download or read book Effect of Nonzero Surface Admittance on Receptivity and Stability of Compressible Boundary Layer written by Meelan Choudhari and published by . This book was released on 1994 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Nonzero Surface Admittance on Receptivity and Stability of Compressible Boundary Layer by : Meelan Choudhari
Download or read book Effect of Nonzero Surface Admittance on Receptivity and Stability of Compressible Boundary Layer written by Meelan Choudhari and published by . This book was released on 1994 with total page 28 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 700 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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Book Synopsis Acoustic Receptivity of Compressible Boundary Layers: Receptivity by Way of Surface-temperature Variations by : Meelan Choudhari
Download or read book Acoustic Receptivity of Compressible Boundary Layers: Receptivity by Way of Surface-temperature Variations written by Meelan Choudhari and published by . This book was released on 1994 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis Acoustic Receptivity of Compressible Boundary Layers by : Meelan Choudhari
Download or read book Acoustic Receptivity of Compressible Boundary Layers written by Meelan Choudhari and published by . This book was released on 1994 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis An Experimental Study of the Receptivity of a Compressible Laminar Boundary Layer and the Effects on Stability and Receptivity of 2-D and 3-D Pressure Gradients by :
Download or read book An Experimental Study of the Receptivity of a Compressible Laminar Boundary Layer and the Effects on Stability and Receptivity of 2-D and 3-D Pressure Gradients written by and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Techniques have been developed to provide, for the first time, pure tone acoustic forcing with a wave packet having a particular wave vector and at instability wave frequencies for a supersonic boundary layer. Receptivity to this pure tone forcing has been studied, initially with continuous forcing and now with well defined wave packets. In the latter case precise measurements can now be made of the detailed response to the free-stream disturbance. The wave velocity and wave vector in the free-stream have been determined consistently. A preliminary finding from the wave packet experiments is that the boundary layer response is broadly in two parts; one which is a local forced response in phase with the free-stream forcing and the other which, at downstream locations, has larger amplitude, is growing with downstream distance and has a significant time delay compared with the first forced response. The explanation for this second wave packet and its relation to the first is not yet clear and is the present subject of detailed investigation. Once the data and an understanding are obtained with the present U + a wave forcing attention will be focused on U - a waves. It was found in 1, that the stream-wise wavelengths of the instability waves and the acoustic U - a free-stream fluctuations were closely matched and it was speculated that this played an important role in receptivity.
Book Synopsis NASA Langley Scientific and Technical Information Output: 1994, Volume 1 by :
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Book Synopsis Stability of Three-dimensional Compressible Boundary Layers by : Eli Reshotko
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Book Synopsis Surface-cooling Effects on Compressible Boundary-layer Instability by : Institute for Computer Applications in Science and Engineering
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Book Synopsis Nonparallel Stability of Three-dimensional Compressible Boundary Layers. Part 1: Stability Analysis by : Nabil M. El- Hady
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