射流泵空化影响因素的数值分析  

Numerical Analysis on the Factors Affecting Cavitation within Jet Pumps

作　　者：龙新平[1,2] 程茜[1,2] 韩宁[1,2] 

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072 [2]流体机械与动力工程装备技术湖北省重点试验室,湖北武汉430072

出　　处：《应用基础与工程科学学报》2009年第3期461-469,共9页Journal of Basic Science and Engineering

基　　金：国家自然科学基金(50579060);流体机械与动力工程装备技术湖北省重点试验室开放基金

摘　　要：基于URANS方法,对射流泵内空化流动进行了数值模拟.采用喷嘴出口处的脉动压强及泵内平均汽相份额为指标分析了不同工作参数、结构参数和初始含气量对射流泵空化影响.结果表明,对同一射流泵,当初始含气量相同时,随着工作压力的升高或出口压力的降低,空化加剧;对同一射流泵在相同工作参数下,水体中初始含气量越高,空化越严重;对不同面积比的射流泵,当初始气含量和工作参数相同时,面积比越小,空化越严重.Based on URANS method, the cavitatating flow within jet pumps was simulated. By introducing the pressure fluctuation in the nozzle exit tip and the averaged vapor phase fraction in the pump as two indicators, the influence of different operating parameters, structure parameter and primary non-condensable gas mass fraction in water on the jet pump cavitation were analyzed. It is found that for a jet pump woking in a fixed suction pressure, the cavitation in the jet pump will become stronger with the increases of work pressure or the decreases of discharge pressure when the primary non-condensable gas fraction in water is fixed; for a jet pump woking in the same operating parameters, cavitation in the pump will become intensive with the increase of the primary non-condensable gas fraction in water; for jet pumps of different area ratio woking in the same operating parameters, the cavitations in the jet pump will become stronger with the decreases of area ratio when the primary non-condensable gas fraction in water is fixed.

关 键 词：射流泵 空化 脉动压强 FLUENT 

分 类 号：TH38[机械工程—机械制造及自动化]