双激盘理论及其在轴流式弯掠动叶栅气动计算中的应用

轴流式弯掠动叶栅对主气流作用有一个不容忽视的径向分力。为此本文提出“双激盘理论”及相应的一套计算方法, 其中包括阻力系数及出口气流角值沿径分布的修正, 用来进行低速低负荷轴流式弯掠(即必须计及叶片径向分力影响的)风扇的设计和性能估计。用一个弯掠动叶和一个非弯掠动叶的风扇进行验证性试验, 结果表明:计算与实测值吻合甚好。 

APPLICATION OF DIACTUATOR DISC THEORY TO AERODYNAMIC COMPUTATION OF AXIAL-FLOW FAN WITH SKEWED-SWEPT ROTOR BLADES

In order to spread the advanced technotogy of aeropropfan,skewed swept rotor blades are applied to axial flow fan and compressor.The diactuartor disc theory model is adopted to calculate the main flow of the skewed swept rotor blades in such a manner,as all blades forces affect on the first actuator disc,but the radial forces of blades vanish abruptly on the second actuator disc.Then the radial distribution of the boundary layer thickness (wake thickness) on the outlet surface of the rotor blade is taken as aerodynamic and aeroacoustic characteristic vectors.The effects of the secondary flow,endwall boundary layer,blades rotation and skewed swept regularity (mainly radial forces of blades) are corrected according to plane cascade testing statistical curves.In addition,the results of four calculations demonstrate the effects of the second actuator disc,radial force and corrected outlet flow angle on magnitudes of the calculation results separately.The aerodynamic and acoustic tests show a good agreement of the calculation results with test data.