轴流压气机级内三维粘性流动的数值模拟

Numerical simulation on IGV/rotor interaction in an axial-flow compressor stage

考虑轴流压气机中实际气流沿径向和周向都不均匀的特点,采用亚松弛方法改进传统的混合界面模型,发展了轴流式压气机级内全三维粘性流场的数值计算程序,并以某轴流式双排对转压气机的进口导叶/转子为研究对象,将本文发展的程序与商用NUMECA软件的结果进行对比,对本文发展的程序进行了验证。对比结果表明:由于混合界面法引入了"人工掺混",商业软件计算得出的总压在通过交界面时存在一定的总压损失,而自编程序计算结果保证了总压在交界面处的一致性。流场分析结果表明:该转子叶片在设计工况下处于负攻角状态,在导叶出口轮毂处、压力面50%弦长处、吸力面靠近尾缘处均出现了轻微的流动分离现象。

A corresponding three-dimensional steady viscous code is developed for simulating the flowfield inside the axial-flow compressor stage.And it considers circumferential and radial non-uniform distribution using the method of under relaxation in mixing plane.An example of IGV/rotor interaction in an axial-flow compressor stage is used to verify the developed method and compared with the results calculated by a commercial CFD solver.Total pressure ratio at mixing plane is nearly constant in the calculation of program but an extent of decline in the commercial CFD solver because of the artificial loss.Results of 3-D simulation also indicate that negative incidence angle for rotor occurs during the design stage,so a little flow separation occurs on pressure surface of the rotor.