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利用激光粒子图像测速技术对阀体后90°圆截面弯管的内部流场进行测量,获取了弯管流场在不同来流流速及观测截面上的高分辨率瞬态速度场数据。分析了图像相关计算所获得的瞬态及时均速度场,对流场进行本征正交分解,并进一步分析重构脉动场中的涡结构特性。结果表明:流体流经蝶阀在弯管中形成卡门涡街,涡结构信息包含在本征正交分解低阶模态中,脉动场的模态重构可以还原涡的流动特性。
The laser particle image velocimetry was used to measure the internal flow field of the elbow pipe with a 90 ° circular cross section. The transient high velocity field data of the elbow flow field at different flow velocities and observation cross sections were obtained. The transient and time-averaged velocity fields obtained by the image correlation calculation are analyzed, and the orthonormal decomposition of the flow field is performed. The vortex structure characteristics in the reconstructed pulsation field are further analyzed. The results show that the fluid flows through the butterfly valve to form Karman vortex street in the elbow. The information of the vortex structure is included in the low-order mode of the eigen-decomposition. The mode reconstruction of the pulsation field can restore the flow characteristics of the vortex flow.