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On the convection velocity of turbulent structures in supersonic shear layers

Dimotakis, Paul E. (1990) On the convection velocity of turbulent structures in supersonic shear layers. California Institute of Technology , Pasadena, CA. (Unpublished) http://resolver.caltech.edu/CaltechAUTHORS:20141104-164138252

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Abstract

An ansatz, complemented by appropriate selection rules, is proposed to estimate the convection velocity U_c of turbulent vortical structures in supersonic shear layers. The proposed scheme assumes that, for supersonic convective Mach numbers, shocks will form in one of the two shear layer free streams. The strength of the shocks is estimated by assuming that the flow configuration is stationary with respect to perturbations in the mean flow quantities caused by the turbulent fluctuations. Given the shock strength, the convection velocity U_c, and the associated convective Mach numbers are calculated by matching the estimated total pressure at the stagnation points in the convected frame. The data indicate a convection velocity U_c that is close to that of one of the free streams. That appears to be well accounted for by the proposed scheme, which also suggests that the flow can undergo large jumps in configuration with small changes in the flow parameters. This has important implications for supersonic mixing and hypersonic propulsion applications.


Item Type:Report or Paper (Technical Report)
Additional Information:© 1990 California Institute of Technology. I would like to acknowledge many useful discussions with Prof. Dale Pullin which occurred in the course of the formulation of these ideas. I would also like to acknowledge the discussions with Jeff Hall and Henning Rosemann, which helped identify the coding error in the implementation of the previous analysis (Dimotakis 1989), and the suggestions with the text by Paul Miller. This work was supported by the Air Breathing Propulsion program of the Air Force Office of Scientific Research, Grant No. 88-0155.
Group:Graduate Aeronautical Laboratories (Fluid Mechanics), GALCIT
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)88-0155
Other Numbering System:
Other Numbering System NameOther Numbering System ID
GALCITFM90-4
Record Number:CaltechAUTHORS:20141104-164138252
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141104-164138252
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51265
Collection:CaltechGALCITFM
Deposited By: Kristin Buxton
Deposited On:05 Nov 2014 00:52
Last Modified:21 Sep 2016 23:05

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