Nonstationary interaction of a supersonic flying object with extended low-density regions in the atmosphere

A three-dimensional numerical model is developed and the aerodynamic loads are determined for the three-dimensional flow acting on a blunt cone flying in the atmosphere along the boundary of a rarefied region, as functions of the degree of immersion of the surface of the body in low-density air. The nonstationary gas-and aerodynamic processes accompanying the entry and exit of the body from the rarefied region are studied. The aerodynamic coefficients obtained with an approximate model are compared with the three-dimensional calculations and found to be in satisfactory agreement with them. Zh. Tekh. Fiz. 68, 32–37 (November 1998)