蒸汽射流直接接触凝结的界面及声压特性  

Study on Interface and Sound Pressure Characteristics of Direct Contact Condensation of a Steam Jet

作　　者：徐强[1] 洪奥越 李翔宇 蒋帅之 郭烈锦[1] XU Qiang;HONG Aoyue;LI Xiangyu;JIANG Shuaizhi;GUO Liejin(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《西安交通大学学报》2024年第9期30-37,共8页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(52076175)。

摘　　要：蒸汽射流在液体中的直接接触凝结引发的剧烈界面振荡及声压振荡,可能导致工业管道系统振动甚至失效,采用高速摄像机与高频水听器,捕捉了射流的界面演化行为及其诱导的声压。研究了3种典型凝结流型下射流界面的径向、轴向振荡与声压振荡特性,并阐明声压振荡产生机理。研究发现:声压波动的概率密度函数在间歇流型下呈左偏单峰分布,在界面振荡流型下呈双峰分布,而在稳定流型下呈对称单峰分布;随蒸汽质量流速升高,无量纲径向、轴向界面振荡强度及声压振荡强度整体呈下降趋势,表现出极强的相关性。建立了基于声压参数的射流喷射长度预测模型,预测值与实验值的误差在±1%内。概率密度及相关性分析结果表明,蒸汽射流凝结的声压振荡是由其界面振荡引起的。Direct contact condensation of a steam jet in flowing water in the pipe will cause intense interface oscillations and sound pressure oscillations.In this paper,a high-speed camera and a high-frequency hydrophone is used to capture the evolution of the jet interface and the induced sound pressure.The radial and axial oscillations and sound pressure oscillations of the jet interface under three typical condensation regimes is studied.Probability density function of sound pressure fluctuation shows a left-skewed unimodal distribution under the Chugging regime,a bimodal distribution under the Oscil-Ⅰcondensation regime,and a symmetrical unimodal distribution under the Stable regime.The intensities of the interface oscillation and sound pressure oscillation decrease as the steam mass flux increases,indicating a strong correlation.A jet penetration length prediction model based on the sound pressure parameter is established,and the error between the predicted value and the experimental value is within±1%.Probability density and correlation analysis provide quantitative confirmation that the sound pressure oscillation of steam jet condensation is caused by its interface oscillations.

关 键 词：蒸汽射流 直接接触凝结 界面振荡 射流喷射长度 

分 类 号：O359[理学—流体力学]