【摘要】 为了研究入口安装螺旋槽对诱导轮气蚀性能的影响,采用试验观测和仿真计算相结合的方法对诱导轮扬程和流道内气穴状态进行研究,分析了设计流量下安装螺旋槽前后诱导轮的气蚀性能和气穴分布,总结了流量变化对诱导轮气蚀性能的影响,对比了不同流量工况下叶尖和螺旋槽内存在的回流现象。结果表明:安装螺旋槽后,气穴位置发生了改变,气穴初生于螺旋槽后缘,并同时向螺旋槽前缘和叶片前后缘发展,诱导轮气蚀性能得到改善;一定范围内,随流量增大,螺旋槽对诱导轮气蚀性能的改善效果增强;螺旋槽流道内回流较强;随流量减小,叶尖和螺旋槽内回流作用增强,回流可以减轻流道堵塞,改善诱导轮气蚀性能。更多还原

【Abstract】 In order to study the performance of the inducer with helical grooves, the inducer head and cavitation status are obtained through numerical simulations and experiments. The cavitation performance and cavitation distribution of the inducer with helical grooves are analyzed at the design flow rate and the situation without grooves is also included. At different flow rates, we also investigate the cavitation performance of the inducer and the backflow which exists in both blade tips and helical grooves. The results demonstrate that after the installation of helical grooves, the cavitation location becomes different. The cavitation appears in the trailing edge of grooves and develops not only along grooves but also towards the leading and trailing edge of blades. The cavitation performance of the inducer has been improved. To a certain degree, the cavitation performance becomes better as the flow rate increases. There is strong backflow in helical groove channels. In blade tips and helical grooves, the backflow increases as the flow rate decreases and the strong backflow will improve the cavitation performance of the inducer by alleviating channel blocking.更多还原