"4.6.2 自吸过程 图4.4所示为模型一自吸泵自吸过程中，叶轮截" 的 英语 翻译
中文
4.6.2 自吸过程
图4.4所示为模型一自吸泵自吸过程中，叶轮截面关键时间点的气液两相分布云图。其中图4.4（a）到图4.4（c）为自吸前期启动阶段，图4.4（d）到图4.4（f）为自吸中期稳定阶段，图4.4（g）到图4.4（i）为自吸后期突变阶段，自吸时间t=16s后为自吸末期正常输水阶段，同时少量剩余气体缓慢排出。
结合自吸泵的初始阶段状态图4.3分析，未启动时，上半段红色区域，气体体积分数为1，下半段蓝色区域，气体体积分数为0，交界面与进水管最低处齐平，交界面气体体积分数介于0-1之间。自吸泵启动后，转速迅速从0增至1800r/min，在叶轮的旋转作用下，泵内储存的水迅速流向出口段，进水管中的气体也迅速进入叶轮，叶轮含气率逐渐增大，且气相从蜗壳小断面一侧的叶轮背面开始，由叶轮进口，沿着叶轮半径方向逐渐扩散，与此同时，泵内一部分储存水携带少许气液混合物先由出口段排出，如图4.4（a）和4.4（b）所示，另一部分水呈抛射状进入气液分离室，此抛射现象在图4.4（a）中最明显。
英语
4.6.2 Self-priming Process
Figure 4.4 shows the gas-liquid two-phase distribution cloud at the critical time point of impeller cross-section during the self-priming process of model-self-priming pump. Fig. 4.4 (a) to f I g. 4.4 (c) is the initial stage of self-priming, Fig. 4.4 (d) to Fig. 4.4 (f) is the stable stage of self-priming, Fig. 4.4 (g) to Fig. 4.4 (i) is the sudden change stage of self-priming, and after self-priming time t = 16 s, it is the normal water-conveying stage of self-priming, while a small amount of residual gas is discharged slowly.
According to the analysis of the initial stage state of the self-priming pump shown in Figure 4.3, when the pump is not started, the volume fraction of the gas in the red region of the first half is 1, the volume fraction of the gas in the blue region of the second half is 0, and the interface is level with the lowest part of the intake pipe, and the volume fraction of the gas in the interface is between 0 and 1. After the start-up of the self-priming pump, the speed increases rapidly from 0 to 1800 r/min. Under the rotating action of the impeller, the water stored in the pump flows rapidly to the outlet section, and the gas in the intake pipe enters the impeller rapidly. The air content of the impeller increases gradually, and the gas phase starts from the back of the impeller on the small section side of the volute, from the inlet of the impeller, along the radius of the impeller. At the same time, part of the stored water in the pump carries a little gas-liquid mixture out of the outlet section. As shown in figs. 4.4 (a) and 4.4 (b), the other part of the water enters the gas-liquid separation chamber in a projectile form. This projection phenomenon is most obvious in Fig. 4 (a).