二维翼型微吸吹气减阻控制新技术数值研究

Numerical Investigation of Drag-reduction Control by Micro-suction-blowing on Airfoil

结合抽吸气转捩控制和微吹气湍流减阻控制的特点,探索了一种新的吸吹气减阻控制技术。使用Fluent求解器,并利用用户自定义函数(UDF)二次开发对其自带的Wilcox转捩模式进行了修正。在此基础上,数值研究了吸吹气控制对翼型阻力性能的影响。结果表明:在一定的吸气量范围内,吸气、吸吹气控制都能使翼型总阻力减小,且在同一雷诺数下,吸气控制能使翼型总阻力减小约3%,而吸吹气联合控制使翼型总阻力减小约16%。由此可见,吸吹气控制技术是一种行之有效的减阻控制技术。

Combining the characteristics of suction-transition control and micro-blowing turbulence-drag-reduction technology, a novel suction-blowing-control technique is put forward to reduce airfoil drag. By using the computational fluid dynamics （CFD） code of Fluent, the Wilcox transition mode is modified by a user-defined function （UDF） and incorporated into the CFD code. Based on the above modifications, the effect of suction- blowing control on the airfoil drag performance is numerically studied. The results show that when the suction flow rate are in a certain range, suction and suction-blowing control can both reduce the total drag of an airfoil. At the same Reynolds number, the leading-edge suction without blowing reduces the total drag below the airfoil by up to 3%, while the suction-blowing control results in a drag reduction by up to 16%. Therefore, the suction-blowing control technique is an effective way for drag reduction control.