脱流 meaning in Chinese
breakaway
separation
stall
Examples
- First super - low specific - speed centrifugal pump has a long and narrow flow passage for its high head and low capacity , and the power absorbed by disc friction is too high , so the efficiency is very low ; secondly the diffusion of flow passage is so high , that the reserved flow often emerges at the inlet and outlet of impeller . therefore the h ~ q characteristic curve is often hump - shaped , and at the low - capacity operating condition the instability often occurs ; thirdly the centrifugal pump at high - capacity operating condition is easy to overload because the n ~ q curve appears a rising trend
首先由于它的扬程较高、流量较小，所以它的流道狭长，圆盘摩擦损失较大，效率相对较低；其次由于它的流道扩散较严重，易在叶片进口产生回流和在出口产生脱流，扬程流量特性曲线易出现驼峰，在小流量工况下易产生不稳定现象；第三，由于其功率流量曲线呈现上升趋势，在大流量区运行时电机易过载。 - With the phenomena of dropping flow , backflow and secondary flow effected by circulation and surface curvature , the centrifugal pump ' s inner flow is very complicated 3d flow . therefore , the centrifugal pump inner flow is one of the difficult problems both in testing research and numeric computation
离心泵叶轮的内部流动是很复杂的三维紊流流动，同时由于受旋转和叶片表面曲率的影响还拌有脱流、回流及二次流的现象，是流体工程中较难的试验研究和数值计算问题之一。