旋流式模型泵内部三维湍流场的测量

为获得旋流泵内部三维湍流场的真实情况,设计制造了模型泵并构造了试验装置.运用激光多普勒测速仪（LDA）,对旋流泵最优工况下的无叶腔及叶轮内部速度场进行了测量,得到周向速度、轴向速度、径向速度及其对应的均方根脉动速度分布等.测量结果表明：旋流泵内流场是强制涡旋和自由涡旋的叠加,同时存在循环流与贯通流,与前人提出的流动模型相吻合;无叶腔与叶轮内周向速度分布差异较大;在叶轮进口处,液流已有预旋,流动撞击损失较大;该型泵内湍流脉动呈各向同性.所得结果不仅可用来验证数值计算结果的准确性,而且为旋流泵内部两相流场的深入研究打下基础.

Measurement on 3D turbulent flow field in vortex pump

In order to get the 3 D turbulent flow structures in vortex pump, a test ng was set up. a special model pump was also designed. Laser Doppler Anemometry （LDA） was used to measure the velocity in volute and impeller of the pump. Three velocity components magnitudes were obtained, so was the mean square root fluctuating value. The internal flow consists of forced vortex and free vortex. Velocity distributions in volute are different from those in impeller. The liquid has been pre-swirled at the inlet of impeller. Impact loss is considerable there. Turbulent fluctuating shows isotropic characteristics. The measured data can be used to validate the numerical simulation results.