Расчётные исследования влияния ветра на аэродинамические характеристики отделяемого головного блока системы аварийного спасения при аварии ракеты на старте

Computational studies of wind impact on the aerodynamic performance of the separation unit of the launch escape system during a launch vehicle failure on the launch pad

The paper examines the effect of wind on the aerodynamic performance of the separation unit during a launch vehicle failure. It considers the case of a launch vehicle failure on the launch pad, which is one of the most difficult cases from the standpoint of executing the maneuver of pulling the spacecraft away from the failed launch vehicle. It addresses the model problem of coaxial separation for the separation unit configuration where the escape system propulsion unit is placed on top, and the option where the main rocket engine operates without active separation engine. The paper presents data on total aerodynamic properties of the separation unit and its front heat shield, the structure and parameters of the flow field in the vicinity of the unit and in the gap between the separating parts, which provide an insight into separation unit aerodynamic behavior during an increase in velocity and a change in wind direction, as well as under interference conditions. The paper demonstrates a significant impact on aerodynamic properties of the simultaneous exposure to wind and jets of the firing propulsion unit of the emergency escape system. The calculations were performed using the Flow Vision software package with the problem stated in quasi-static terms.