Date of Award

Fall 1984

Document Type

Thesis

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

Robert L. Ash

Committee Member

D. M. Bushnell

Committee Member

O. Baysal

Committee Member

G. Selby

Call Number for Print

Special Collections; LD4331.E56L54

Abstract

This paper presents results of a numerical study of the effect of wall temperature control on the low speed aerodynamic drag of axisymmetric bodies at turbulent Reynolds numbers and zero angle of attack.

Results for both skin-friction and pressure drag were computed for slender bodies using first-order viscous-inviscid interaction theory. Computations using boundary-layer theory were conducted to evaluate the effect of wall heat transfer on bluff-body separation control. Wall heat transfer with 100 percent surface coverage (for all bodies) as well as some partial surface coverage cases were investigated. The wall-to­ tota1-freestream temperature ratio was varied between 0.08 and 2. Key computational results predict: (1) up to a 20 percent total drag reduction for a wall-to-total-freestream temperature ratio of 2 for the case of a streamlined slender body whose total drag was 90 percent skin­ friction drag at adiabatic wall condition and (2) a sizable delay of afterbody boundary-layer separation due to wall cooling for bluff bodies, Possible applications relevant to this study are drag reduction for bodies with cryogenic fuel (e.g., liquid hydrogen) and the effect of planetary-entry-induced wall heating for bodies upon terminal ballistics/maneuvering.

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In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

DOI

10.25777/ywc3-0227

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