前缘弯掠(扭)斜流转子叶尖脱落涡的PIV研究

应用PIV技术测量了一开式前缘弯掠(扭)斜流转子的叶尖脱落涡的结构及其发展演化趋势，测量结果表明，叶尖脱落涡产生于叶片顶部区域，沿着一条与转子旋转方向相反的斜线向下游发展．叶尖脱落涡的强度随叶轮转速的提高而增强，随背压的提高而减弱，当背压增加到一定程度时，叶尖脱落涡消失．实验结果为前缘弯掠(扭)斜流转子在大型中央空调室外机上的应用和优化设计及其降噪提供重要的内流实验数据．

PIV experimental research of the tip shedding vortex flow of the leading edge skewed-swept diagonal flow rotors

The stall condition at the lower flow rate and the stall margin of diagonal flow rotors could be improved with the help of a leading edge skewed-swept diagonal flow rotors. The structure and the evolvement process of the tip edge shedding vortex of an open skewed-swept diagonal flow rotor by using PIV technology were measured. The results showed that the shedding vortex emerged near the tip edge of the blade, and extended to the downstream of the rotor in a slant line opposite to the rotor rotation direction. The intensity of the tip shedding vortex was boosted up with the increase of the rotation speed and decreased with the increase of the background pressure. The tip shedding vortex disappeared when the background pressure was increased to a certain degree. The experimental results provided the important data of internal flow for the optimization, the noise reduction and application of the leading edge skewed-swept diagonal flow rotors on the outdoor unit of the centralized air conditioners.