Flow characteristics of drag and heat reduction of typical and derived aero-spikes configuration
In order to explore a better derived configuration of the aero-spike for drag and heat reduction of the supersonic blunt aircraft,numerical simulation was used to study the flow characteristics of three kinds of typical configurations with single flow interferent,six kinds of configurations with double flow interferents,two types of configurations with multiple flow interferents and blunted cone-spike;it was believed that the geometric essence of adding an aero-spike was equivalent to a"hollowed-out"conical blunt body.The simulation results showed that when the relative diameter of the flow interferent at the head was large,the variation curve of drag reduction rate with the relative length of the spike didn't have an obvious peak point,instead,there was a peak stage with very little variation,and the drag reduction effect was best when the relative diameter was about 0.3-0.4;the maximum drag reduction rates of the typical spikes were about 50％and slightly increased by using configurations with double flow interferents;when multiple flow interferents were added in the middle,the drag reduction rates increased with the growing number of flow interferents,the maximums were more than 60％,but the aerodynamic heating problem was more serious.In comparison,the blunted cone-spike had the best comprehensive performances of drag and heat reduction,its maximum drag reduction rate could reach about 60％,and the heat reduction rate was about 7％.
aero-spikederived configurationsupersonicdrag and heat reductionflow characteristics
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