探究串联文丘里管空化特性

Research on Cavitation Characteristics of Series Venturi

为了研究串联文丘里管的空化特性,采用数值模拟方法,建立文丘里管空化模型与压力损失模型,基于入口压力和水温变化进行单级、多级串联文丘里管内空化效果演变过程的研究;以平均气含率为空化效果表征,得到文丘里管串联级数与空化特性的关系,得到出口锥角与文丘里管的匹配关系,得到单级和多级串联之间空化效果的演变规律。提出了以空化效应的介质(水)的性质——电导率为空化实验表征,验证串联文丘里管的空化特性。实验结果表明:实验压力下(<1 MPa)单级文丘里管水样的电导率大于串联管,随着空化时间的增加水样的电导率增加;电导率可以作为表征空化效果参数之一。为串联文丘里管空化与压力、温度的关系提供指导,为空化效果的实验表征提供新的方法。

In order to study the cavitation characteristics of series venturi,a cavitation model of venturi is established in this paper.Based on the change of inlet pressure and water temperature,the evolution process of cavitation effect in single-stage and multi-stage series venturi is studied.Taking the average gas holdup as the characterization of cavitation effect,the relationship between the series number of Venturi tubes and cavitation characteristics is obtained,the matching relationship between the exit cone angle and Venturi tube is obtained,and the evolution law of cavitation effect between single-stage and multi-stage series is obtained.In order to verify the cavitation characteristics of series Venturi tubes,the conductivity of cavitation medium(water)is used as the experimental characterization.The experimental results show that:under the experimental pressure(<1MPa),the conductivity of single-stage venturi water sample is greater than that of series tube,and the conductivity of water sample increases with the increase of cavitation time;the conductivity can be used as one of the parameters to characterize the cavitation effect.This paper provides guidance for the relationship between cavitation and pressure and temperature,and provides a new method for the experimental characterization of cavitation effect.