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压气机的叶片宛如一个机翼,当沿展向的环量分布不均匀时,会有尾涡出现,引起展向环量分布不均匀的原因是多方面的。在亚音速转子中,可能的原因如下:1)原设计的展向环量分布不均匀;2)叶片在非设计工况下工作;3)环壁边界层存在和根部叶片的大折转角诱发的根部叶片通道二次流也能改变此段叶片截面上的环量分布,而叶片的有限展长在顶端截面上也会诱导附加环量,等等。尾涡的存在会产生诱导攻角和改变出气角,最终导致环量沿展向重新分布。文献[1]提出了描述尾涡影响的扰动势场方程。在无粘和稳定条件下,方程可写成
Compressor leaves like a wing, when the ring along the spread of uneven distribution, the tail vortex will appear, causing the uneven distribution of the exhibition ring due to many reasons. In the subsonic rotor, the possible reasons are as follows: 1) the original design of the ring to the uneven distribution of the amount; 2) leaves in non-design conditions; 3) The secondary flow in the root vane passage also changes the distribution of the ring volume in this section of the vane, while the limited elongation of the blade induces an additional amount of ring at the tip cross-section, and so on. The presence of wake vortices induces an angle of attack and changes the angle of exit, eventually leading to a redistribution of the ring volume along the span. Literature [1] proposed a perturbation potential field equation describing the effect of wake vortex. In the non-stick and stable conditions, the equation can be written as