基于非线性空化的离心泵内部流动特性分析

发布时间：2018-04-22 12:38

本文选题：离心泵 + 非线性空化　；参考：《原子能科学技术》2016年07期

【摘要】：为研究离心泵发生空化时叶轮内部瞬态不稳定流动变化规律,本文应用ANSYS-CFX软件对离心泵内部发生空化时进行定常和非定常计算,采用泵内部不同流道的速度场、压力场、气体体积分数以及压力脉动情况的计算结果分析流道内部瞬态非线性的流动变化规律。研究结果表明:受动静干涉及蜗壳喉部面积等因素的影响,离心泵内部各流道空化的发展是非线性的,随着空化的发展,叶轮内部压力场、速度场和各流道气体体积分数的分布是不对称的。导致这种非线性空化现象的主要原因是蜗壳结构的不对称以及流道内中间流面到叶片背面所在流道区域的空化进程不同步;在空化不严重的情况下,不同流道的脉动呈现相同的规律,但严重空化情况下,压力脉动主频混乱,规律性减弱。
[Abstract]:In order to study the law of transient unstable flow in impeller when cavitation occurs in centrifugal pump, the steady and unsteady calculation of cavitation in centrifugal pump is carried out by using ANSYS-CFX software, and the velocity field and pressure field of different flow channels in the pump are adopted. The calculation results of gas volume fraction and pressure pulsation are used to analyze the transient and nonlinear flow in the flow channel. The results show that the cavitation development in the centrifugal pump is nonlinear due to the influence of static and dynamic interference and throat area of the volute. With the development of cavitation, the pressure field in the impeller is not linear. The distribution of velocity field and volume fraction of gas in each channel is asymmetric. The main causes of this nonlinear cavitation are the asymmetry of the volute structure and the process of cavitation from the middle flow surface in the channel to the flow channel area on the back of the blade. The pulsation of different channels shows the same law, but in the case of severe cavitation, the main frequency of pressure pulsation is chaotic and the regularity is weakened.
【作者单位】：江苏大学流体机械工程技术研究中心;
【基金】：国家自然科学基金资助项目(51379091) 国家杰出青年科学基金资助项目(51509112) 江苏省自然科学基金科技项目资助(BK20130516)
【分类号】：O35;TH311

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