CAJ | 학술논문

在低速大尺寸压气机实验台上,利用体视图像粒子测速(SPIV)技术测量了设计状态和近失速状态转子尖部的三维复杂流动,对典型二次流流动结构的特性及其产生、发展和演化机制做了研究.实验测量覆盖整个转子通道,从测量得到的各阶物理量中可以识别出叶尖泄漏涡、角区旋涡、通道涡和进口导叶尾迹等多种二次流流动结构.通过分析各种二次流流动结构造成的流动堵塞和损失发现:在设计状态,叶尖泄漏涡是流动堵塞和损失的主要来源,在转子出口处造成的流动堵塞约为总流量的0.35%;在近失速状态,角区旋涡对流动堵塞和损失的分布起了决定性作用,造成的流动堵塞可以达到总流量的8.5%.最后,借鉴二次流理论对角区旋涡的产生、发展和演化机制做了理论分析,结果表明角区旋涡的发展过程主要由流向速度的展向分布规律决定.
재저속대척촌압기궤실험태상,이용체시도상입자측속(SPIV)기술측량료설계상태화근실속상태전자첨부적삼유복잡류동,대전형이차류류동결구적특성급기산생、발전화연화궤제주료연구.실험측량복개정개전자통도,종측량득도적각계물리량중가이식별출협첨설루와、각구선와、통도와화진구도협미적등다충이차류류동결구.통과분석각충이차류류동결구조성적류동도새화손실발현:재설계상태,협첨설루와시류동도새화손실적주요래원,재전자출구처조성적류동도새약위총류량적0.35%;재근실속상태,각구선와대류동도새화손실적분포기료결정성작용,조성적류동도새가이체도총류량적8.5%.최후,차감이차류이론대각구선와적산생、발전화연화궤제주료이론분석,결과표명각구선와적발전과정주요유류향속도적전향분포규률결정.
The flow fields near the rotor tip region of an axial compressor are measured by stereoscopic particle image velocimetry (SPIV) on a large-scale low-speed axial compressor test facility under both the design and near-stall conditions, and the flow mechanisms of some typical secondary flow structures are studied. According to the measured results, many secondary flow structures can be identified, such as the tip leakage vortex, corner vortex, passage vortex and inlet guide vane wake. Among these complicated flows, the tip leakage vortex and corner vortex are the two key flow structures contributing to large flow blockages and losses. In the design condition, the evolution of tip leakage vortex determines the flow blockage and causes a blockage of about 0.35% of the total massflow at the outlet of the rotor passage. In the near-stall condition, the corner vortex causes the most significant flow blockage and makes a maximum blockage of about 8.5% of the total massflow inside the rotor passage. Finally, theoretical analysis is made to clarify the evolution mechanism of the corner vortex. The results show that the evolution of the corner vortex is mainly determined by the spanwise distribution of the streamwise velocity in the rotor passage.