摘要
针对某大型耙吸挖泥船高压冲水泵在轻载吃水、大流量冲舱工况下必需汽蚀余量过高问题,通过对叶轮进行改型优化,在保持原水力性能的条件下降低临界汽蚀余量,实现汽蚀性能优化。采用CFD技术对优化前后的高压冲水泵外特性及汽蚀性能进行数值模拟,对比优化前后大流量冲舱工况的关键性能参数,并分析优化前后的空化流场。结果表明,通过叶轮吸口尺寸放大及叶片改型优化,4种施工工况的水力性能满足设计要求,大流量冲舱工况下的临界汽蚀余量由10.47 m下降至6.03 m,有效提高了高压冲水泵的汽蚀性能。
For the problem that the required net positive suction head(N_r) of a high-pressure flushing pump in a large trailing suction hopper dredger is too high under the light-load and large flow rate conditions,the impeller is optimized to reduce the critical N_(r) while maintaining the original hydraulic performance.In this study,numerical simulations of the cavitating flow in the high-pressure flush pump before and after optimization are carried out by CFD technology,and the key performance parameters as well as the cavitation flow field are compared for the large flow rate conditions.The results show that the critical net positive suction head point is reduced from 10.47 m to 6.03 m under the large flow rate flushing condition by enlarging the suction diameter and modifying the blade while the hydraulic performance in the four conditions is maintained to meet the desigh requirement,which means the cavitation performance of the high-pressure flushing pump has been effectively improved.
作者
刘遇谱
唐鹏飞
曹蕾
庄海飞
胡京招
LIU Yupu;TANG Pengfei;CAO Lei;ZHUANG Haifei;HU Jingzhao(CCCC National Engineering Research Center of Dredging Technology and Equipment Co.,Ltd.,Shanghai 200082,China)
出处
《水运工程》
2025年第2期218-224,共7页
Port & Waterway Engineering
关键词
耙吸挖泥船
汽蚀性能
优化设计
叶片改型
trailing suction hopper dredger(TSHD)
cavitation performance
optimization design
blade modification
作者简介
刘遇谱(1997-),男,硕士,助理工程师,研究方向为疏浚泥泵的设计与研发。
