Abstract

A new free floating internally mountable balance system that ensures unrestrained motion of the model exposed to hypersonic flow in the shock tunnel has been designed, fabricated and tested. The drag force acting on a blunt leading edge flat plate has been measured using the new balance system. The model acceleration in the axial direction is measured using an accelerometer by ensuring unrestrained model motion during testing in the hypersonic shock tunnel. The balance has been calibrated by an impulse hammer. To measure the drag force, normal force and pitching moment of a typical hypersonic vehicle, another free floating balance configuration has been designed, fabricated and tested. Finite element modeling (FEM) and CFD are exhaustively used in the design and calibration of the two balances. The experimentally measured drag force on the blunt leading edge flat plate at nominal Mach number of 5.75 matches well with FEM results. The details of the study are described in this paper.

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