卧式离心泵性能预测的动态
性能预测的关键是对泵内各种损失的计算。卧式离心泵内的水利损失主要是叶轮和蜗壳内的损失。性能预测采用的方法可归纳为两种：
损失模型法。通过对各部分水力损失的物理本质及其影响因素的分析，寻求水力损失与结构参数的关系，对流场作一定的假设、简化，建立水力损失的计算模型。该方法的优点是可以全面考虑诸如二次流、进口回流、边界层分离、漩涡和尾迹等各种因素的影响，对实际的性能预测有很高的实用性和准确性。
数值方法，又称为数值试验或计算试验法。目前纯数值方法主要是基于计算流体力学对泵内流场进行数值模拟，得到泵内流场信息，进而计算出卧式离心泵的扬程、功率、效率和流量之间的关系，实现对卧式离心泵性能的预测(图\文www.wxjpby.com/)。
中译英：
Performance prediction is the key to pump a variety of loss calculation. Horizontal centrifugal pump water loss is the loss of impeller and volute. Performance prediction methods can be classified into two:
Loss model method. Based on the physical nature of each part hydraulic loss and analysis of its influence factors, seek hydraulic loss and the relationship between the structural parameters of flow field, make certain assumptions, a simplified, establishing the hydraulic loss calculation model. The advantage of this method is that can be considered in a comprehensive way such as two flow, inlet reverse flow, boundary layer separation, vortex and wake and the influence of various factors, the actual performance prediction is of high practicability and accuracy.
Numerical method, also known as the numerical experimental or computational experimental method. The pure numerical method is mainly based on the computational fluid dynamics numerical simulation of the flow field inside the pump, get the pump flow information, then to calculate the horizontal centrifugal pump head, power, efficiency and the relation between flow, realize the horizontal centrifugal pump performance prediction.
