Masters Theses

Date of Award

12-1991

Degree Type

Thesis

Degree Name

Master of Science

Major

Aerospace Engineering

Major Professor

E. M. Kraft

Committee Members

K C. Reddy, A. D. Vakili

Abstract

Steady-state numerical solutions of the Euler equations for the flow field about a wing/pylon/finned store configuration at a Mach number of 0.95 have been obtained for several store locations and attitudes. The objectives of the study were to gain insight into requirements for future computational trajectory prediction methods, to compare computational loads and pressures to test data, and to investigate a mutual interference correction implemented in a semi-empirical trajectory program. To meet these objectives, CFD solutions were obtained placing the store at the carriage position, at 0.25, 0.50, 1.0, and 4.0 store body diameters below the carriage position, and at a position determined by the wind tunnel trajectory simulation test. Load predictions were also obtained from the trajectory program for these positions. The CFD pressure distributions for the store at the carriage and trajectory positions agreed well with the measured test data, and the CFD loads on the store in these two cases agreed fairly well with the test loads. Conversely, the loads from the basic semi-empirical trajectory prediction program were in poor agreement with the measured loads and CFD loads in all cases. However, when properly applied, the mutual interfer- ence loads corrections in the trajectory prediction program provide a reasonable approximation to the CFD loads. Over the course of this investigation, it was found that grid density, geometric ac- curacy, and viscosity requirements for future CFD trajectory predictions are extremely dependent on the physical properties of the store of interest and the method of release.

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