EFFECTS OF ABLATION ON THE PITCHING MOMENT DERIVATIVES OF CONES IN HYPERSONIC FLOW
FLUIDYNE ENGINEERING CORP MINNEAPOLIS MN DBA/PHOENIX SOLUTIONS CO
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The work presents a method of calculating the static and dynamic pitching moment derivatives at hypersonic speeds for pointed or slightly blunted cones performing small-amplitude, single-degree-of-freedom oscillations about an arbitrary pivotal axis, taking into account the effects of ablation or blowing over all or specified portions of the cone surface. The study is motivated by the need for detailed understanding of the large destabilizing changes in the pitching oscillations sometimes observed on re-entry vehicle test flights. In the analysis, the ablation gases leaving the body are assumed to produce the following two-fold effect 1 A deflection of the external flow which produces a change in the local static pressure coefficient readily calculated by the Newtonian flow theory and 2 a change in the local skin-friction coefficient.
- Fluid Mechanics