贯流泵扩管内流场的三维LDV测量

摘要

贯流泵扩管对贯流泵装置性能的改善有一定作用,采用三维多普勒激光测速仪(LDV)对贯流泵扩管内流场进行流动测量,获得了扩管内各速度分量的分布规律,周向速度从进口到出口逐渐减小,靠近轮毂处和轮缘处周向流速逐渐减小；轴向速度呈“U”形分布,靠近壁面流速很小,中间区域的流速比较大,随着扩管的扩散,轴向速度有减小的趋势；径向速度的分布情况也是中间速度比较大,靠近壁面处流速减小.同时将测量结果与CFD计算结果进行了比较.结果表明:计算值与试验值的流速分布趋势基本一致,两者的周向速度和轴向速度比较接近,但是径向速度由于其本身的流速较小,所以从相对值来说计算值和试验值偏差比较大.%Diffuser can improve the performance of tubular pump to a certain extent. Three dimensional laser Doppler velocimetry (3D-LDV) technique was used to measure the flow field in guide vane of tubular pump, and the velocity distribution inside the diffuser was obtained. The circumferential velocity gradually decreased from inlet to outlet, the axial velocity distributed like U-shaped, the velocity close to the wall was low, and the velocity of middle area was relatively high, the radial velocity distribution velocity was also relatively high speed. The flow field between experimental and numerical results agreed well with each other- It showed that the distribution of circumferential velocity and axial velocity were similar, but the radial velocity deviation between the LDV results and the CFD ones was big.