性能預測的關(guān)鍵(jiàn)是對泵内各種損失的(de)計算。 卧式(shì)離心泵 内的水利(lì)損失主要是(shì)葉輪(lún)和蝸殼内的損失(shī)。性能預測采(cǎi)用的方法可歸納爲兩種：
損失模型法。通過對各部分水力損(sǔn)失的物理本質(zhì)及其影(yǐng)響因素的分析，尋求水力損(sǔn)失與結構參數的關系，對流(liú)場(chǎng)作一定的假設、簡化，建(jiàn)立水力損失的計(jì)算模型。該方法(fǎ)的優點是可以全面(miàn)考(kǎo)慮諸如二次流、進口回流、邊界層(céng)分離、漩渦和尾迹等各種(zhǒng)因素(sù)的影(yǐng)響，對實際的性能預測有很高的實用性和準(zhǔn)确性。
數值方法，又稱爲數值試驗或計算試驗法。目前純數值方法主要是基于計算(suàn)流體力(lì)學對泵内流場進行數值模拟，得到泵内(nèi)流場信息，進而計(jì)算出卧式離心泵的揚程、功率、效(xiào)率(lǜ)和流量之間的關(guān)系，實現對 卧式離(lí)心泵 性能的預測(圖\文 xiaojikuaipao.top/ )。
中譯(yì)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.