摘要
针对配流系统中存在的空化现象,本文主要对转套式配流口和泵腔空化特性进行对比分析。采用Fluent对系统进行流体动力学仿真计算,并采用Singhal空化理论模型,在相同转速、相同入口压力和相同负载压力条件下,对配流口和泵腔的空化气体体积分布云图、平均气体体积分数曲线图以及速度矢量图进行对比分析。研究结果表明,配流口内平均气体体积分数整体小于泵腔,且最大体积分数出现时间较早、整个空化过程持续时间短;另外,在配流口和泵腔内会出现涡流,而且随着涡流加剧,空化现象也更严重,说明配流口作为两个不同压力场之间的连接部分,空化程度没有低压区域剧烈,其中一个原因是高压区会抑制空化现象,另外则是高压区和低压区连通后低压区内会产生剧烈涡流,导致低压区局部压力降低。该研究为后期系统结构优化提供了理论依据。
In the distribution system,cavitation has an important influence on the system’s working efficiency,working noise and working life.The pump chamber and the distribution port are the main places where the working medium of the rotary sleeve distribution system changes and the pressure changes frequently,so cavitation is easy to occur here.The purpose of this paper is to compare the difference between the cavitation characteristics of the distribution port and the pump chamber and explore the reasons.Fluent was used for fluid dynamics simulation calculation of the system,and Singhal cavitation theoretical model was adopted.The cavitation gas volume distribution cloud diagram,the average gas volume fraction curve and the velocity vector diagram were compared under the same speed,the same inlet pressure and the same load pressure.The results show that the average gas volume fraction in the distribution port is smaller than that in the pump chamber,and the maximum volume fraction appears earlier and the whole cavitation process lasts shorter.In addition,vortex will appear in the distribution port and pump chamber,and the cavitation phenomenon will be more serious as the vortex intensifies.The above description shows that the degree of cavitation in the distribution port as the connection between two different pressure fields is not as severe as in the low pressure region.One of the reasons is that the high pressure region will suppress the cavitation phenomenon.This research provides a theoretical basis for the optimization of the later system structure.
作者
孙泽豪
张洪信
赵清海
姜晓天
SUN Zehao;ZHANG Hongxin;ZHAO Qinghai;JIANG Xiaotian(Power Integration and Energy Storage System Engineering Technology Center of Qingdao University,Qingdao 266071,China)
出处
《青岛大学学报（工程技术版）》
CAS
2020年第2期91-96,共6页
Journal of Qingdao University(Engineering & Technology Edition)
基金
国家自然科学基金资助项目(51575286)。
