【摘要】 为了研究压气机中采用弯曲叶片对叶栅流场气动性能的影响,本文应用Beam Warming近似隐式因子分解格式以及MML代数湍流模型,采用拟压缩性方法求解雷诺平均拟压缩N S方程组,对弯曲叶片压气机叶栅内三维粘性流场进行了数值模拟。结果表明,在给定的条件下,三种叶栅内涡系结构具有某种相似性。反弯叶栅吸力面/端壁角区分离严重,中部流动较为理想;正弯叶栅基本消除了吸力面/端壁角区分离,但中部分离较明显;这些又导致三种叶栅流道中涡的大小和强弱存在明显的不同。计算结果与实验结果比较,两者吻合较好。更多还原

【Abstract】 The numerical simulation has been carried out to investigate the secondary flow in the compressor cascades composed of the positive curved blades and negative curved blades.The method of the pseudocompressibility was used and the incompressible NavierStokes equations were solved with BeamWarming’s implicit approximate factorization algorithm and the MML turbulence model.It is shown that the structures of vortices in these cascades are similar in some extent under the given condition.Separation is severe in corner area of suction surface/endwall in negative cascade.who has an ideal flow in the midarea,In positive cascade,separation almost disappears in corner of suction surface/endwall,but it appears in the midarea.These result in that the vortices have no the same size and intensity.The agreement of calculated results with the experimental data is favorable.更多还原