关键词: 叶尖泄漏涡, 端壁堵塞, 逆压梯度, 湍流掺混, 体式激光粒子测速, 压气机

Abstract: Rotor passage flow fields were measured by SPIV in a large-scale low speed axial compressor test facility. The measurements were conducted at the conditions of stages with different aerodynamic loading levels, different rotor tip gap sizes and different operating conditions. The variations of blockage inside the rotor passage were analyzed in quantitative method. The results showed that: in the tested conditions the distribution of blockage by the TLV has the characteristics of non-linear and non-monotonicity, which means the peak blockage occurs inside the rotor passage; the adverse pressure gradient is the most important physical mechanism for the growing of the blockage; at the environment of adverse pressure gradient the higher of initial mass flow rate in the blockage region，the faster of growth of blockage and the higher of initial total pressure deficit, the easier it is to cause stall; Intensive turbulent mixing occurs between the tip leakage flow and the mainstream, and the transport of kinetic energy between the mainstream and tip leakage flow by the viscosity and turbulent fluctuation in the turbulent mixing is the main mechanism for blockage decay.

Key words: tip leakage vortex, endwall blockage, pressure gradient, turbulent mixing, SPIV, compressor