性能預測的關鍵是對泵(bèng)内各種損失的計算(suàn)。 卧式離心(xīn)泵 内的(de)水利損(sǔn)失主(zhǔ)要是(shì)葉輪(lún)和蝸殼内的損(sǔn)失。性能預測采(cǎi)用的方法(fǎ)可歸(guī)納爲兩種：
損(sǔn)失(shī)模型法。通(tōng)過對各部(bù)分(fèn)水力損失的物理本質及其(qí)影響因素(sù)的分析，尋(xún)求(qiú)水力損失與(yǔ)結構(gòu)參數(shù)的關(guān)系，對(duì)流場(chǎng)作一(yī)定的(de)假(jiǎ)設、簡化，建立(lì)水力(lì)損失的計(jì)算模型。該(gāi)方法(fǎ)的優點(diǎn)是可以(yǐ)全面考慮(lǜ)諸如(rú)二次流、進口回(huí)流、邊界層(céng)分離、漩渦和尾(wěi)迹等(děng)各種因素的影(yǐng)響，對(duì)實(shí)際的性(xìng)能預測有很高(gāo)的實用性和準(zhǔn)确性。
數值(zhí)方法(fǎ)，又稱爲(wèi)數值試(shì)驗或(huò)計算(suàn)試驗(yàn)法。目前純(chún)數值(zhí)方法主要(yào)是基于計算流體力(lì)學對泵内流場(chǎng)進行數值模拟(nǐ)，得(dé)到泵(bèng)内(nèi)流場信息(xī)，進而計算(suàn)出卧式離(lí)心泵(bèng)的揚程(chéng)、功率、效(xiào)率和流(liú)量之間(jiān)的(de)關系(xì)，實現對(duì) 卧式離心(xīn)泵 性能的(de)預測(圖\文(wén) xiaojikuaipao.top/ )。
中譯英(yīng)：
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.