文丘里管内NaOH溶液的空化现象及其诱发的压力脉动特征分析  

Cavitation phenomenon and cavitation-induced pressure fluctuations in NaOH solutions passing through Venturi pipe

作　　者：李明义[1] 朱洋[1] 张文斌 余政 康灿[1] LI Mingyi;ZHU Yang;ZHANG Wenbin;YU Zheng;KANG Can(School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;No.704 Institute of China State Shipbuilding Corporation Limited,Shanghai 200031,China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013 [2]中国船舶集团有限公司第704研究所,上海200031

出　　处：《江苏大学学报（自然科学版）》2023年第1期104-111,共8页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51676087)。

摘　　要：借助文丘里管空化可视化实验台,采用高速相机捕捉空化区的瞬态几何形态,借助高频压力脉动测试系统获取流场中的压力脉动特征.以清水和质量分数为0.5%和1.0%的NaOH溶液为液体介质,并考虑介质体积流量对空化现象的影响,对空化区的形态、压力脉动功率谱密度及均方根能量值进行综合分析.研究结果表明:NaOH溶液中空化强度比清水高,且NaOH溶液质量分数的增加会导致空化加剧;清水中空化区尾部存在空化泡回流特征;空化现象的发生激发NaOH溶液中的高频压力脉动,而压力脉动功率谱密度与空化强度不存在正相关关系;清水和NaOH溶液中的压力脉动均方根能量峰值出现的位置均随介质体积流量的增加而向下游推移,1.0%NaOH溶液中的均方根能量值最大.With the cavitation visualization experiment rig involving Venturi pipe segment, the instantaneous cavity profiles were captured using high-speed camera, and the pressure fluctuations in the flow field were recorded using high-frequency pressure fluctuation measurement system. Pure water and NaOH solutions with mass fractions of 0.5% and 1.0% were selected as liquid mediums. The effect of volumetric flow rate of the liquid medium on the cavitation was investigated. The comprehensive analyses of cavity morphology, power spectra density and root mean square(RMS) energy of pressure fluctuation were implemented. The results show that the cavitation intensities in the two NaOH solutions are relatively higher than that in pure water, and the increasing of NaOH mass fraction can promote the severity of cavitation. In pure water, backflow of cavitation bubbles at the downstream end of cavity zone is remarkable. The cavitation can stimulate high-frequency fluctuations in the NaOH solutions, while the power spectra density is not positively related to the cavitation intensity. The position of the maximum RMS energy of pressure fluctuation shifts downstream with the increasing of flow rate, and the highest RMS energy of pressure fluctuation is obtained in 1.0%NaOH solution.

关 键 词：NAOH溶液 空化现象 质量分数 压力脉动 功率谱密度 均方根能量 

分 类 号：TB126[理学—工程力学]