Date of Award

Fall 1978

Document Type

Thesis

Degree Name

Doctor of Philosophy (PhD)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

Surendra N. Tiwari

Committee Member

James N. Moss

Committee Member

G. L. Goglia

Committee Member

James L. Cox, Jr.

Committee Member

Charles H. Cooke

Abstract

The influence of changes in the precursor region flow properties (resulting from absorption of the radiation from the shock layer) on the entire shock layer flow phenomena around a Jovian entry body is investigated under physically realistic conditions. In the precursor region, the flow is considered to be inviscid and the variations in flow properties are determined by employing the small perturbation technique as well as the thin layer approximation. The flow in the shock layer is assumed to be steady, axisymmetric and viscous. The analysis is carried out by considering both the chemical equilibrium and nonequilibrium composition of the shock layer gas. The effects of transitional range behavior (slip boundary conditions on the body surface and at the shock wave) are included in the analysis of high altitude entry conditions.

Realistic thermo-physical and radiation models are used and results are obtained by employing the implicit finite difference technique in the shock layer and an iterative procedure for the entire shock layerprecursor zone. Results obtained for a 45° hyperboloid blunt body entering the Jupiter's atmosphere at zero angle of attack indicate that pre-heating of the gas significantly increases the static pressure and temperature ahead of the shock for entry velocities exceeding 36 km/sec. The nonequilibrium radiative heating rate to the body is found to be significantly higher than the corresponding equilibrium heating. The precursor heating, in general, increases the radiative and convective heating to the body, and this increase is slightly higher for the nonequilibrium conditions.

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DOI

10.25777/kbam-1e86

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