混流式叶轮瞬态空化特性研究

发布时间：2018-07-07 14:10

本文选题：混流式叶轮 + 汽液两相　；参考：《中国农村水利水电》2016年07期

【摘要】：为研究混流式叶轮空化性能,基于空泡动力学理论和计算流体力学方法,对某混流泵进行设计工况下的汽液两相瞬态仿真计算。分析不同空化余量下叶轮内部空泡分布情况,探究空泡随时间的变化特点,捕捉空化初生、空化发展以及空泡溃灭的过程,寻求空泡含量的变化规律。结果表明,在叶轮叶片头部最先初生空化,随着空化的发展,空泡逐渐向叶片出口、叶片正背面、甚至叶轮流道扩散。若叶片空化达到一定的程度,则叶片背面空化区域远远大于正面,但体积组分大的空泡多集中于叶片正面靠近头部位置。叶轮内空泡含量随时间以近似指数的形式上升,其空化速度与空化余量成反比。当空化余量足够低时,空泡将迅速堵塞整个叶轮流道。
[Abstract]:In order to study the cavitation performance of a mixed flow impeller, based on the cavitation dynamics theory and computational fluid dynamics method, the vapor-liquid two-phase transient simulation of a mixed flow pump under design conditions was carried out. The distribution of cavitation in impeller under different cavitation residues is analyzed, and the variation characteristics of cavitation with time are explored, the process of cavitation initiation, cavitation development and cavitation collapse is captured, and the variation law of cavitation content is sought. The results show that the primary cavitation occurs first at the blade head of the impeller, and with the development of cavitation, the cavitation gradually diffuses to the blade outlet, the blade is positive and the back, and even the impeller passage is diffused. If the blade cavitation reaches a certain degree, the cavitation area on the back side of the blade is much larger than that on the front side, but the cavitation with large volume components is concentrated near the head position in the front of the blade. The cavitation velocity is inversely proportional to the cavitation allowance. When the cavitation margin is low enough, the cavitation will quickly block the entire impeller passage.
【作者单位】：西华大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(51379179) 西华大学研究生创新基金资助项目(ycjj2015047)
【分类号】：TH313

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