射流泵内部流动的实验研究

Experimental Study of Flows in a Jet Pump

实验研究射流泵内有限空间水射流与其周围低速水流间的紊动混合。在射流泵 11个轴向位置上布置了测压点 :1个在渐缩锥形喉管入口 ,6个在喉管 ,4个在扩散管。用U型管测量 11个测压点的壁面压强。用粒子图像速度场仪(PIV)对射流泵喉管入口和喉管内有限空间水射流进行测量。获得了 4种流量比情况下射流泵对称面流场的速度矢量和轴心速度分布。

For carrying out the experimental study of the turbulent mixing between water jets in a jet-pump confined space and its surrounding low-velocity water-flow streams, static pressure taps were arranged at 11 axial locations. The pressure taps assume the following layout: one tap at the inlet of a converging conical throat, 6 taps in the throat, and the remaining 4 in a diffuser pipe. Wall-surface static pressure was measured at 11 pressure measuring points by using a U-type tube. Measurements were taken of the water jets in a confined space at the jet pump throat inlet and inside the throat by using a particle image velocimetry device. As a result, the distribution of velocity vector and axial velocity on the symmetrical flow field was obtained under four flow-rate ratios. The measurement results may provide a reliable basis for the analysis of internal flows of jet pump.