Experimental Study of Transition in a Compressible Free Shear Layer

1982 ◽  
Author(s):  
Anthony Demetriades ◽  
Timothy L. Brower
Keyword(s):  
Experimental Study ◽  
Shear Layer ◽  
Free Shear Layer

Experiments on nonlinear interactions in the transition of a free shear layer

1973 ◽  
Vol 59 (1) ◽  
pp. 1-21 ◽  
Author(s):  
Richard W. Miksad
Keyword(s):  
Experimental Study ◽  
Shear Layer ◽  
Upper Bound ◽  
Finite Amplitude ◽  
Mode Competition ◽  
Nonlinear Interactions ◽  
Free Shear Layer ◽  
Number Of Components ◽  
Frequency Components ◽  
Fluctuation Energy

An experimental study is made of nonlinear interactions in a laminar free shear layer. Two disturbances (f1 and f2), excited by sound, amplify and grow independently for small amplitudes. At larger amplitudes the disturbances interact to generate fluctuations of sum and difference frequencies (f2 ± f1). Harmonics and subharmonics of f1 and f2 are also generated and all fluctuations interact to generate additional fluctuations of the form (nf2/m) ± (pf1/q); n, p = 1,2,3,…, m, q = 1,2. Nonlinear mode competition suppresses the growth of f1 or f2, depending on their relative amplitudes, and contributes to finite amplitude equilibration. An upper bound on the modal integral of total u′r.m.s.2 fluctuation energy is found. Fluctuation energy tends to be distributed among all possible frequency components, and its upper bound does not increase as the number of components increases.

An Experimental Study of the Effect of Grid Turbulence on Shear Layer Evolution

2004 ◽  
Vol 126 (2) ◽  
pp. 286-290 ◽  
Author(s):  
Amy Warncke Lang ◽  
Begon˜a Gomez
Keyword(s):  
Experimental Study ◽  
Shear Layer ◽  
Reynolds Stress ◽  
Coherent Structures ◽  
Growth Rates ◽  
Free Stream ◽  
Water Tunnel ◽  
Grid Turbulence ◽  
Free Shear Layer ◽  
Entrainment Process

An experiment was performed in a shear layer water tunnel to determine the effect that grid turbulence, introduced within the meeting of the two streams, had on the evolution of a free shear layer. DPIV results show that the presence of grid turbulence inhibited the growth of the large coherent structures formed in the undisturbed shear layer, and thus led to an alteration of the entrainment process of free stream fluid into the shear layer. This caused more symmetry and various growth rates in the shear layer evolution. Also, the peak Reynolds stress magnitudes increased with the presence of grid turbulence.

Experimental study of free-shear layer transition above a cavity at Mach 3.5

1989 ◽  
Author(s):  
RUDOLPH KING ◽  
THEODORE CREEL, JR. ◽  
DENNIS BUSHNELL
Keyword(s):  
Experimental Study ◽  
Shear Layer ◽  
Free Shear Layer ◽  
Layer Transition

Experimental study of shear-layer/acoustics coupling in Mach 5 cavity flow

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 242-252
Author(s):  
O. H. Unalmis ◽  
N. T. Clemens ◽  
D. S. Dolling
Keyword(s):  
Experimental Study ◽  
Shear Layer ◽  
Cavity Flow

Shear-layer acoustic radiation in an excited subsonic jet: experimental study

2005 ◽  
Vol 333 (10) ◽  
pp. 746-753 ◽  
Author(s):  
Vincent Fleury ◽  
Christophe Bailly ◽  
Daniel Juvé
Keyword(s):  
Experimental Study ◽  
Shear Layer ◽  
Acoustic Radiation ◽  
Subsonic Jet
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