A Quasi-Two-Dimensional Aerodynamic Force Model for Star-Shaped Bodies at Hypersonic Velocities.
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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A theoretical framework is provided for determining the aerodynamic forces on star-shaped geometries during high-altitude re-entry flight. In effect, this involves the formulation of expressions for the viscous and pressure forces acting on wedges at various inclinations to the flow. Since the relatively high Mach numbers and low Reynolds numbers involved in early re-entry do not allow the classical separation of a flow field into a distinct boundary layer and inviscid shock layer, the method necessarily accounts for the considerable interaction effects and off-design conditions which are encountered. Consideration is given to both the theoretical methods suggested for evaluation of these viscous effects and their validity. Numerical results for star geometries indicate relatively good agreement with experimental data for angles of attack from 0 to 16 and Reynolds numbers from 1.6 x 10,000 to 2 x 1,000,000 at Mach 15 to 20. For still smaller Reynolds numbers, a free molecule force model furnishes a first approximation to behavior at very high altitudes. Author
- Numerical Mathematics
- Fluid Mechanics