附面层抽吸对转子激波结构和分离流动的影响

Effects of BLS on the Shockwave Structure and Separation Flow of Fan Rotor

通过在叶片表面进行开缝抽吸组织激波结构、控制附面层流动以提高叶片做功能力、降低损失已被证明是一项行之有效的方法。以两级风扇的第2级转子为研究对象,通过吸力面和压力面的抽气研究,揭示了抽吸流与激波之间的相干效应以及抽吸流与分离流的相互制约关系。结果表明:通过抽吸能够控制通道中激波的相对位置,改变通道中激波结构,可以避免由于激波造成的附面层分离;通过适当的附面层抽吸可以消除分离区复杂的旋涡结构,提高通道中的气流流通能力,从而改善整个级的性能。

The boundary layer suction （BLS） has been proved very effeetively in shockwave structure organizing and boundary layer separation controlling to enhance the working ability and decrease the loss of a cascade. The second stage rotor of a two stage fan was chosen as the research subject, the BLS was applied to the suction surface （SS） and pressure surface （PS） of the rotor blade. The interactions between shockwave and separation flow and the interactions between suction flow and separation flow were investigated and discussed in detail. By BLS, the position of the shockwave can be controlled, the structure of the shockwave through the passage can be changed and the boundary layer separation due to the shockwave can be avoided, and moreover, the complex structure in the separation region can be eliminated and the circulating ability of the flow passing through the passage can be enhanced, and therefore the performance of the whole stage can be improved.