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卧式離(lí)心泵性能預測的動态

性能預(yù)測的(de)關鍵是對泵内各(gè)種損失的計算。 卧式離心泵 内的(de)水利損(sǔn)失主要是葉輪和(hé)蝸殼内的損失。性能預測采用的方法可歸納爲兩種：
損失模型法。通過(guò)對各部分水力損失(shī)的物理本質及(jí)其影響因素的分析，尋求水力損失與結(jié)構參數的關系，對流場(chǎng)作(zuò)一定的假設、簡化，建立水力損失的計算模型。該方(fāng)法的優點是可以全面考慮諸(zhū)如二次流、進口回流、邊界層分離、漩渦和尾迹等各(gè)種因素的影響(xiǎng)，對實際的性能預測有(yǒu)很高的實用性和準确性。
數值方法，又稱爲數值試驗或(huò)計算試驗法。目前純數值方法主要是基于計算流體力學(xué)對泵(bèng)内流(liú)場進行數(shù)值模拟，得到泵内流(liú)場信息，進而計(jì)算出卧式離心泵的揚(yáng)程、功率、效率和流量之(zhī)間的關系(xì)，實現對 卧(wò)式離心泵 性能的預測(圖(tú)\文 xiaojikuaipao.top/ )。
中譯英：
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.