Cavitation damage in engine cooling water pump is the main factor that shortens the lifespan of the cooling system and gives rise to undesirable phenomena such as vibration and noise. In order to reveal the influence of key factors such as temperature and speed on the cavitation performance of engine cooling water pump, the cavitation performance of the engine cooling water pump under different rotating speeds and temperatures is obtained through the experimental study, and the cavitation flow pattern in the engine cooling water pump under different temperatures is captured using high-speed photography. The result shows that, as the temperature of the working medium changes from 25 °C to 70 °C, the head of the pump increases by 5.9% under the part-loading condition, the efficiency has an increase by 7.1% near the design condition and the shaft power keeps decrease by about 5.6%. Cavitation performance under different rotating speeds is found not to agree with the similar law. With the increase of temperature, the inlet pressure of cavitation initial increases and the cavitation performance deteriorates, the cavitation distribution region inside the impeller gradually expands and presents asymmetric distribution, indicating that thermodynamic effect has a positive effect on the occurrence of cavitation in the engine cooling water pump.

发动机冷却水泵中的气穴损坏是缩短冷却系统寿命并引起不良现象（如振动和噪音）的主要因素。为了揭示温度和速度等关键因素对发动机冷却水泵空化性能的影响，通过实验研究，得出了不同转速和温度下发动机冷却水泵的空化性能，并得出了空化流量。使用高速摄影拍摄不同温度下发动机冷却水泵中的图像。结果表明，当工作介质的温度从25°C变为70°C时，在部分负载条件下，泵的扬程增加了5.9％，效率提高了7。接近设计条件1％，轴功率保持降低约5.6％。发现在不同转速下的空化性能与类似定律不一致。随着温度的升高，汽蚀的初始入口压力增加，汽蚀性能下降，叶轮内部的汽蚀分布区域逐渐扩大并呈现不对称分布，表明热力学效应对发动机冷却中的汽蚀产生有积极的影响。水泵。