华中科技大学学报（自然科学版）2024，Vol.52Issue(6)：71-79,9.DOI:10.13245/j.hust.240619
基于空化时空分布特征的调节阀空蚀风险预测
Prediction of cavitation erosion risk in regulating valve based on space-time distribution characteristics of cavitation
摘要
Abstract
Aiming at the problem of poor cavitation resistance and short service life in the regulating valve of the key equipment in coal liquefaction engineering,these images of cavitation flow field in a regulating valve were captured by a high-speed camera,the characteristic parameter void fraction λ was proposed for quantitative analysis of a gas-phase volume fraction,and the change rate of void fraction β was also employed as the cavitation erosion risk to predict the cavitation damage on the regulating valve accurately.Results show that there is a positive correlation between the void fraction and the gas volume fraction.With the increase of inlet pressure,the void fraction at the spool head,the throat and the expansion section increase,cavitation develops fully and extends to the expansion section and then collapses.The cavitation in the regulating valve presents a periodic trend as birth,development,shedding and collapse.Furthermore,if the change rate of void fraction β＜0,it represents the collapse of cavitation.Therefore,the change rate of void fraction could be used to judge whether there is a risk of cavitation erosion.With the increase of inlet pressure,the attached cavitation is fixed at the spool head,which is the main reason for the cavitation damage of the spool.While the free cavitation damage area gradually extends downstream with the increase of inlet pressure.The cavitation damage area at the top and bottom part of the flow channel is asymmetric,and the cavitation damage area in the bottom part is overall ahead of it at the top part.关键词
空化/调节阀/空隙率/空蚀破坏/风险预测Key words
cavitation/regulating valve/void fraction/cavitation erosion/risk prediction分类
机械制造引用本文复制引用
张雨佳,刘秀梅,李贝贝,刘申..基于空化时空分布特征的调节阀空蚀风险预测[J].华中科技大学学报（自然科学版）,2024,52(6):71-79,9.基金项目
国家自然科学基金资助项目(51875559) （51875559）
江苏省优势学科平台资助项目. （）
