水科学与水工程2010，Vol.3Issue(3)：321-330,10.DOI:10.3882/j.issn.1674-2370.2010.03.008
Orifice plate cavitation mechanism and its influencing factors
Orifice plate cavitation mechanism and its influencing factors
摘要
Abstract
The orifice plate energy dissipater is an economic and highly efficient dissipater.However,there is a risk of cavitaion around the orifice plate flow.In order to provide references for engineering practice,we examined the cavitation mechanism around the orifice plate and its influencing factors by utilizing mathematical analysis methods to analyze the flow conditions around the orifice plate in view of gas bubble dynamics.Through the research presented in this paper,the following can be observed:The critical radius and the critical pressure of the gas nucleus in orifice plate flow increase with its initial state parameter τ0;the development speed of bubbles stabilizes at a certain value after experiencing a peak value and a small valley value;and the orifice plate cavitation is closely related to the distribution of the gas nucleus in flow.For computing the orifice plate cavitation number,we ought to take into account the effects of pressure fluctuation.The development time of the gas nucleus from the initial radius to the critical radius is about10-7-10-5 s;therefore,the gas nucleus has sufficient time to develop into bubbles in the negative half-cycle of flow fluctuation.The orifice critical cavitation number is closely related to the orifice plate size,and especially closely related with the ratio of the orifice plate radius to the tunnel radius.The approximate formula for the critical cavitation number of the square orifice plate that only considers the main influencing factor was obtained by model experiments.关键词
orifice plate cavitation/gas nucleus/critical radius/critical pressure/pressure fluctuation/critical cavitation numberKey words
orifice plate cavitation/gas nucleus/critical radius/critical pressure/pressure fluctuation/critical cavitation number分类
建筑与水利引用本文复制引用
Wan-zheng AI,Tian-ming DING..Orifice plate cavitation mechanism and its influencing factors[J].水科学与水工程,2010,3(3):321-330,10.基金项目
This work was supported by the National Natural Science Foundation of China(Grant No.50879021). （Grant No.50879021）
