多喷嘴气—液两相喷射过程的试验  

Experimental on Multi Nozzle Steam-liquid Two-phase Ejecting Process

作　　者：马昕霞[1,2] 袁益超[1] 刘聿拯[1] 黄鸣[3] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海电力学院能源与环境工程学院,上海200090 [3]上海市质量监督检验技术研究院,上海200233

出　　处：《机械工程学报》2011年第22期147-152,共6页Journal of Mechanical Engineering

摘　　要：近年来国内外学者在气—液喷射技术方面开展了大量的工作,但这些研究采用的工作蒸汽主要是干饱和蒸汽和过热蒸汽,关于湿蒸汽的研究较少,然而在实际工业中,相当一部分低压蒸汽是具有一定干度的湿蒸汽。为此,设计以湿蒸汽为工作蒸汽试验台,采用一种多喷嘴结构的汽液喷射器作为试验元件,对气—液两相喷射过程进行试验研究,得到不同蒸汽干度下,喷射器内的压力变化及蒸汽压力和低温水温度对喷射器内气、液两相混合均匀程度的影响。结果表明,蒸汽干度未明显影响混合室内的压力分布规律;水喷嘴出口处压力和混合室圆柱段入口处压力均在某蒸汽压力时达到极小值,且该蒸汽压力值大于喷射器的最佳蒸汽压力;提高蒸汽压力或增大低温水温度有助于混合室内气、液两相流体混合均匀。During the past years,much work has been done to study the steam,liquid jet technology.However,the working steam in these work are mainly supersaturated steam and superheated steam,work on wet steam in steam-liquid jet technology has not been reported.In industrial application,wet steam with certain dryness is often used as low-pressure steam.Therefore,steam-liquid two-phase flow process is studied on a steam-liquid ejector with multi-nozzle structure by using wet steam as working steam.The pressure change in the ejector and the effect of steam pressure and cool water temperature on the evenness degree of steam and liquid phase mixture in the ejector are obtained.As can be seen from the results,steam dryness has little effect on the pressure distribution in the ejector.The pressure at the outlet of water nozzle and the inlet of cylindrical section of mixing chamber reaches the minimal value under a certain steam pressure,and the value of steam pressure is greater than the optimal steam pressure.Increasing steam pressure and cool water temperature are all helpful to the uniform mixing of steam and liquid phase in mixing chamber.

关 键 词：气—液两相流 多喷嘴喷射器 干度 低温水 

分 类 号：TK219[动力工程及工程热物理—动力机械及工程]