Aerodynamic shape optimization for the demonstration recoverable rocket fairing
The CAD/CFD integrated simulation method was proposed to optimize the aerodynamic shape of a recoverable rocket fairing.Firstly,the aerodynamic performance simulation of the original shape was carried out.The effect of the fairing on the aerodynamic performance of the rocket was re-vealed.Then,the combined optimization method of FloEFD+HEEDS was used to carry out the aero-dynamic performance simulation of 128 different fairing shapes with the maximum normal force as the optimization objective.The results show that the linearity of the normal force and pitching moment coefficients become worse under the condition of small angle of attack due to the improper fairing shape.Under the condition of positive angle of attack,the pressure difference between the upper and lower surfaces of the fairing causes negative normal force and upward force moment,thus cance-ling out part of the normal force and pitching moment generate by body of the rocket.Through the automatic optimization algorithm,the optimal aerodynamic fairing shape of the reusable demonstra-tion rocket is obtained under the constraint of the current size.The normal force coefficient of the optimized aerodynamic shape is increased by 8 times.
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