Abstract
The effects of the aerodisk and opposing jet on the drag and heat reduction are studied by the computational fluid dynamics method. The results show that the flat aerodisk possesses the highest drag and heat reduction efficiency. The opposing jet pushes the reattachment shock away from the blunt body, thus reducing the shock intensity and improving the drag and heat reduction efficiency. In addition, the low-temperature jet gas directly cools the blunt body to achieve heat reduction. The multi-objective design optimization of the spiked blunt body with the flat aerodisk and opposing jet is conducted. The objective functions are the drag coefficient and total heat flux of the blunt body. The constraint is the mass flow of opposing jet. The design variables are the length of spike, diameter of aerodisk, total pressure ratio, and size of opposing jet. According to the surrogate models, the effect trends of design variables on objective functions and constraint are studied. The optimal solutions for different weighting coefficients are obtained, and they match well with the Pareto frontier calculated by the NSGA-II method. The effect of the upper limit of constraint on the Pareto frontier is studied.
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