惯性粒子分离器清除流道PIV测量与分析

采用粒子成像测速技术（PIV）对惯性粒子分离器弯曲通道模型进行内部流动测试，分析其清除流道流场的结构特点。试验发现，在清除流道进口的不同高度截面上均有回流涡的存在，在不同清除流比（SCR，14%~20%）、不同流量下回流涡结构不同。回流涡的存在是导致小粒径颗粒分离效率低的原因之一。试验结果表明：固体壁面对该回流涡存在很大影响，即越靠近壁面回流涡尺度越大；当SCR值越大时，回流涡占清除流道面积越小；而当进口流量增大时，回流涡尺度变化很小。内部流场以及回流涡尺度的主要影响因素为SCR。本文结果可以为数值模拟以及分离器结构改进提供依据。

PIV test and flow analysis of scavenge passage in inertial particle separator

The internal flow field of an inertial particle separator model is tested by the technology of particle image velocimetry (PIV), and the structure characteristics of the flow field is analyzed. According to the experimental results, an obvious separated flow can be found near the entrance of the scavenge flow path along different heights, and the behaves differently with different parameter scavenge core ratio (SCR,14% to 20%) and inlet flow rate. The existence of the separated flow is one of the reasons that result the low separation efficiency of the small size particles. Experimental results show that the solid wall has great influence on the scale of the separated flow, and the closer to the wall, the bigger the backflow vortex is. When the SCR increases, the scale of the separated flow gets smaller. With the increase of the inlet flow rate, there is little change of separated flow scale. It is shown that the internal fluid field and the separated flow scale are mainly determined by the SCR parameter. The results can provide reference for the numerical simulation and improvement of the separator structure.