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卧(wò)式離(lí)心泵性能(néng)預測的動态(tài)

性能預(yù)測的關鍵(jiàn)是對(duì)泵内(nèi)各(gè)種損失(shī)的計算。 卧式離(lí)心泵 内(nèi)的(de)水利(lì)損失(shī)主要是葉輪和蝸殼内的(de)損失(shī)。性(xìng)能(néng)預測(cè)采用(yòng)的方(fāng)法可(kě)歸納爲兩種：
損(sǔn)失模型(xíng)法。通過對各(gè)部分(fèn)水力(lì)損失的物理本(běn)質及其(qí)影(yǐng)響(xiǎng)因素的分析，尋求(qiú)水力損失(shī)與結(jié)構參數的(de)關系(xì)，對流場作一定的假(jiǎ)設(shè)、簡(jiǎn)化，建(jiàn)立水力損失的計算模型。該方(fāng)法的優(yōu)點是可以全(quán)面考慮諸(zhū)如二次流、進口(kǒu)回流、邊界層分(fèn)離、漩渦(wō)和尾迹等各(gè)種(zhǒng)因素的(de)影響，對實際的(de)性能預測有很高的(de)實用(yòng)性和(hé)準确(què)性。
數值方(fāng)法，又(yòu)稱(chēng)爲數值試驗或計算試(shì)驗法。目前純數(shù)值方法(fǎ)主要是基于(yú)計(jì)算流體力學對(duì)泵内流(liú)場進行數值模(mó)拟，得到泵(bèng)内流(liú)場信息，進(jìn)而計算出卧(wò)式離心(xīn)泵的揚(yáng)程、功率(lǜ)、效率(lǜ)和流量之(zhī)間的關系，實現(xiàn)對 卧(wò)式離心泵(bèng) 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.