low specific-speed meaning in Chinese
低比速
Examples
- Super - low specific - speed centrifugal pump is a part of centrifugal pumps , which is widely used in aerospace and petrochemical industries
极低比转数离心泵（ ns < 30 ）是离心泵的一部分，其在宇航事业和石化工业等领域应用广泛。 - According to the distribution of pressure and velocity on the 5 types of impeller , it analyses and discribes the feature of internal flow in super - low specific - speed pump impeller
通过对五种叶轮内流动的模拟比较，描述了极低比转数叶轮内流动的特点。 - This thesis also describes the numerical simulation of three - dimensional turbulent flow in super - low specific - speed impeller , points out the turbulence model and numerical solution for it , and gives the writer ' s view of the grid - generation
论文的另一部分工作是数值模拟极低比转数泵叶轮内部流动，提出了适合的湍流模型和数值解法，并对网格的划分提出了自己的看法。 - In present thesis , the actual design theories and methods for super - low specific - speed pump are introduced first , including " the increased flowrate design method " , " the method of anti - hump on h ~ q characteristic curve " , " non - overload design method " , " the design method of complex impeller " and so on . according to these methods , 5 types of impeller have been designed
论文首先对极低比转数离心泵的现行设计理论和设计方法作了介绍，包括加大流量设计法、减小或消除扬程曲线驼峰的途径、无过载设计及复合叶轮设计法等，并按照这些方法设计了五种叶轮。 - 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。