Study on Drag and Heat Reduction Performance of Opposing Jet at Different Angle of Attack

In this paper, the numerical simulation method of N-S (Navier-Stokes) equation based on SST k-ω turbulence model is used to explore the influence of the interference flow field generated by the interaction between the coaxial or non-coaxial opposing jet and the blunt body with the free stream under different angle of attack on the drag and heat reduction effect. The results show that compared with the no-jet condition, the coaxial opposing jet can effectively reduce the drag coefficient of the blunt body, and the drag coefficient can be reduced by 32.53% when the angle of attack is 2°. When the angle of attack is small, the coaxial opposing jet can effectively reduce the wall Stanton number. And when the angle of attack is large, the wall Stanton number on the windward side becomes large and that on the leeward side is greatly reduced. The change of the axial angle between the opposing jet and the blunt body affects the flow field and the drag and heat reduction effect. As the angle between the jet and the axis increases, the wall pressure on the windward side gradually decreases, and there is a jet angle that can make the peak value of the wall Stanton number reach the optimal solution. Compared with the coaxial opposing jet, when the angle of attack is 5°, the peak value of the wall Stanton number can be reduced by 9.02%, and when the angle of attack is 8°, the drag reduction effect can be increased by up to 1.92%.