基于CST方法的高空低雷诺数吸附式叶型耦合优化设计

研究了一种基于类别形状函数变换（CST）方法的吸附式叶型优化设计方法，该方法可以在高空低雷诺数条件下对叶型和抽吸方案耦合优化.结果表明:优化之后在20km高空低雷诺数条件下总压损失降低了65%，静压升提高了0.02，气动性能得到较大提升.而且由于优化过程中罚函数的引入使得优化后吸附式叶型在地面条件下性能也有所提高.对于高空低雷诺数条件下吸附式叶型在抽吸位置之前适当的增加叶型负荷，再通过抽吸来控制附面层，效果最优.并且最佳抽吸位置位于层流分离泡作用区域内.在层流分离泡作用区域内抽吸可以完全消除层流分离泡对叶型性能的影响，并且可以较好控制附面层位移厚度和动量厚度的增加，有效地减小附面层内的动量损失. 

Coupling optimization design of aspirated airfoil with low Reynolds number in high altitude based on CST method

A optimization design method was studied which coupled airfoil with aspirated scheme in the condition of low Reynolds number based on class shape transformation(CST) method. Research results show that:the coupling optimized design can make the total pressure loss reduce by 65%, the static pressure ratio increase by 0.02, and aerodynamic performance gets an obvious enhancement the in the condition of high altitude of 20km and low Reynolds number. Due to the penalty functions introduced, optimized airfoil aerodynamic performance was also improved in the condition of ground. To aspirate airfoil in the condition of low Reynolds number in high altitude, the design of increasing the load in the front of the aspiration location appropriately, and controlling the boundary layer by aspiration was optimum. And the optimal aspiration location was located in the region of the laminar bubble. Aspiration in the region of the laminar bubble can completely eliminate the laminar separation bubble. And the growth of the displacement thickness and momentum thickness can be inhibited effectively, and the momentum loss within boundary layer can be reduced significantly.