【摘要】 本文采用雷诺平均Navier-Stoke方程对离心压气机进行了非定常数值模拟，获得了叶轮内凝结的非定常演化过程。结果表明，受蜗壳非对称结构影响，在一个叶轮旋转周期内叶片前缘压力面凝结区出现了三角形分布。与叶顶间隙内凝结相关的高能量比模态主要有：平均流动模态、与叶频(BPF)相关的三种模态(0.5BPF, 1.0BPF, 1.5BPF)。低静压条带LP1引起了这四种模态的局部扰动，模态扰动区与凝结区位置对应，进而从流场结构表明低静压条带LP1对叶顶间隙内凝结的影响。更多还原

【Abstract】 In this paper, unsteady numerical simulations of a centrifugal compressor were performed by employing the Reynolds-averaged Navier-Stoke equation to obtain the unsteady evolution of condensation in the impeller. The results show that a triangular distribution of the condensation region at the pressure surface of the leading edge of the blade appears during a rotation period due to the asymmetric structure of the volute. The high energy ratio modes associated with the condensation in the tip clearance are mainly: the averaged flow mode, and three modes(0.5BPF,1.0BPF, 1.5BPF) associated with the blade passing frequency(BPF). The low static pressure strip LP1 causes local perturbation of these four modes, and the location of the mode perturbation zone corresponds to the condensation region. Thus, the effect of the low static pressure strip LP1 on the condensation in the tip clearance is revealed from the flow field.更多还原