自吸喷灌泵自吸过程的非定常流动数值计算与验证

发布时间：2018-01-13 14:05

  本文关键词：自吸喷灌泵自吸过程的非定常流动数值计算与验证　出处：《农业工程学报》2016年16期 　论文类型：期刊论文

  更多相关文章： 数值计算 泵 灌水 自吸 非定常

【摘要】：为了建立一种适合自吸喷灌泵在自吸过程中的气液两相流数值模拟方法,采用ANSYS CFX软件,进行仿真自吸喷灌泵自吸过程的数值计算,研究自吸过程中气液混合、气液分离及气液逸出现象,分析自吸过程中泵内部的速度、压力及含气率的变化规律,了解自吸过程的气液两相流特点。自吸泵的整个自吸过程分为3个阶段:自吸初期由叶轮旋转作用排水产生的吸气阶段(t≤0.5 s)、自吸中期由气水混合及气水分离作用产生排气功能的吸气阶段(0.5 st≤4 s)、自吸末期由进口段的水进入泵体内部产生排气功能的吸气阶段(t4 s)。自吸成功的关键就是叶轮的旋转迫使叶轮进口处少量的水混合着一部分气体沿着叶轮叶片压力面流动至叶轮出口处并进入正反导叶,然后沿着反导叶叶片压力面流出,表明在自吸过程中气水混合物总是沿着较高的压力面流动。通过采用摄影技术得到多级自吸喷灌泵在自吸初期及中期时泵出口段水柱高度的变化规律,发现试验结果与数值计算结果非常相近,不仅两者的变化规律基本相同,而且其结果相差不超过6%。
[Abstract]:In order to establish a numerical simulation method of gas-liquid two-phase flow suitable for self-sucking sprinkler pump, the self-suction process of self-priming sprinkler pump was simulated by ANSYS CFX software. The phenomena of gas-liquid mixing, gas-liquid separation and gas-liquid escape in the process of self-priming are studied, and the variation law of the velocity, pressure and gas content in the pump during the self-priming process is analyzed. The characteristics of gas-liquid two-phase flow in the self-priming process are understood. The whole self-priming process of the self-priming pump is divided into three stages: the inspiratory stage (t 鈮，

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