进口旋流周向位置对高压涡轮进口导叶气动特性的影响

为了揭示旋流周向位置对下游进口导叶(IGV)气动特性的影响机理,采用数值模拟方法计算并分析了进口旋流在多个不同周向位置处时旋流与通道内二次流的相互作用原理,进而重点分析了3个典型位置算例中的二次流动、涡系结构和熵增情况。研究表明:进口旋流与通道内固有二次流动之间的相互作用及黏性耗散是旋流所造成损失的主要原因；通道损失最大的工况不在旋流正对叶片头部时出现,而是在旋流靠近叶片头部近压力面一侧时产生；此外,旋流与通道涡相互作用,在进口旋流达到一定强度时会在叶片尾缘附近形成诱导涡。 

Effect of pitchwise position of inlet swirl on aerodynamic characteristics of high-pressure turbine IGV

In order to reveal the impact mechanism of pitchwise position of inlet swirl on the aerodynamic characteristics of downstream IGV(inlet guide vane), the interaction mechanism between upstream inlet swirl and secondary flow in the channel with swirl in different pitchwise positions was analyzed and simulated by computational fluid dynamics method. The details of secondary flow, vortex system structure and entropy increase were discussed respectively for three typical position cases. Results indicated that viscous dissipation and the interaction of swirl and secondary flow led to the majority of aerodynamics loss. The maximum passage loss appeared when the inlet swirl was located towards the pressure-side near the head of IGV, instead of the accurate IGV head. Moreover, the interaction of swirl and passage vortex could induce a shed vortex around the trailing-edge if the intensity of inlet swirl was up to a certain extent.