Aerodynamic Disturbances on Rapidly Rotating Spacecraft in Free-Molecular Flow

摘要

We investigate the aerodynamic forces and moments exerted upon axisymmetric bodies rotating about their symmetry axis in a free-molecular flow The velocity field consists of a mean flow at arbitrary orientation relative to the body superimposed upon a random thermal motion described by the Maxwell-Boltzman velocity distribution The gas-surface interaction model is based upon a combination of specular and diffuse reflections as characterized by normal and tangential momentum accommodation coefficients For the general case, expressions for the aerodynamic disturbances are given in the form of surface integrals. Analytical and numerical results are presented for the case of a spinning sphere.