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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。
Particle flow imaging (PIV) was used to test the internal flow of the curved channel model of inertial particle separator, and the structural characteristics of its flow field were analyzed. The results show that there are return vortices at different height cross sections at the inlet of purge runner, and the structure of return vortex is different under different flow rates (SCR, 14% -20%). The presence of reflux vortex is one of the reasons leading to the low efficiency of particle separation of small size particles. The experimental results show that the solid wall has great influence on the return vortex, that is, the larger the SCR value, the larger the SCR value is, the smaller the return vortex account for the purge flow channel area. When the inlet flow rate increases, The return vortex scale changes very little. The main influencing factor of internal flow field and backwave scale is SCR. The results of this paper can provide the basis for numerical simulation and improvement of separator structure.