文丘里气泡发生器内气液两相流流型及压降实验研究  

Experimental Research on Pressure Drop and Flow Regime of Gas-liquid Two-phase Flow through Venturi Bubble Generator

作　　者：赵梁 张楚谦 黄江 赵阳[2] 张鹏 胡杰 ZHAO Liang;ZHANG Chuqian;HUANG Jiang;ZHAO Yang;ZHANG Peng;HU Jie(Sichuan Key Laboratory of Civil Aircraft Fire Science and Safety Engineering,College of Civil Aviation Safety Engineering,Civil Aviation Flight University of China,Guanghan 618307,China;Shenyang National Laboratory for Materials Science,Northeastern University Joint Division,Shenyang 110819,China;Chengdu Femto Measurement&Control Co.,Ltd.,Chengdu 610065,China;China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]中国民用航空飞行学院民机火灾科学与安全工程四川省重点实验室,民航安全工程学院,四川广汉618307 [2]沈阳材料科学国家研究中心东北大学联合研究分部,辽宁沈阳110819 [3]成都方拓测控有限公司,四川成都610065 [4]中国空气动力研究所与发展中心,四川绵阳621000

出　　处：《原子能科学技术》2023年第3期514-526,共13页Atomic Energy Science and Technology

基　　金：国家自然科学基金(51201009);中国民用航空飞行学院科研基金面上项目(J2020-108,J2021-106)。

摘　　要：针对一类文丘里气泡发生器内气液两相流动的流型及压降开展了实验研究。通过可视化实验观测区分了气泡发生器内3种基本流型,包括泡状流、弹状流和柱状流。实验发现,随着两相流从弹状流转变为柱状流,气泡发生器内压降迅速增大。通过对压力信号的时频分析,证明气泡发生器出口位置最有利于压力信号的在线监测。从压力信号中提取了与流型转变紧密相关的概率密度函数相对峰度和功率谱密度差异系数,并分别应用于弹状流-柱状流和泡状流-弹状流流型转变的识别。由于已有的压降模型无法准确预测文丘里气泡发生器的整体压降,为此本研究提出了新的压降预测方法。新关联式考虑了气泡发生器内部分单液相流过程以及流型转变对压降预测的影响,预测值与实验测量结果吻合较好,相对均方根偏差约为10.74%。Venturi-type bubble generator as well as its performance has been received wide attentions by engineers and researchers in recent decades.In this paper,experimental research was carried out to study flow regime and pressure drop of the gas-liquid(air-water)two-phase through a Venturi bubble generator.The bubble generator was designed with a rectangular cross section,and the gas was injected into the high speed water flow from the throat section of the Venturi.Interface distribution and dynamic processes of bubbles were observed with a high speed camera,and the static pressures of inlet,throat and outlet of the bubble generator were measured by pressure sensors.Such three basic regimes as bubbly,slug and column are preliminarily identified in the bubble generator by visual experimental observations.A significant increase of the pressure drop of the bubble generator is found in the experiment when the flow regime transformed from slug into column.In order to identify the flow regime of the bubble generator,time frequency of pressure signal was analyzed,and it is found that the outlet section of the bubble generator is confirmed as the most favorable position for pressure signal on-line monitoring.A relative kurtosis of probability density function and a coefficient of variation of power spectrum density strongly associated with flow regime transition were extracted from the pressure signals,and they were applied to identify slug-column and bubbly-slug transition,respectively.Since the traditional pressure drop models can’t precisely predict the whole pressure drop of the Venturi bubble generator,a new pressure drop prediction method is proposed.The effects of partial liquid single-phase flow and flow regime transition on the pressure drop prediction are considered in the new correlation by introduced two modified parameters,?′andθ′,respectively.Both of the two modified parameters were fitted from the current experimental results.Prediction results of the new correlation agree well with those of the experimen

关 键 词：气液两相流 文丘里式气泡发生器 压力信号 流型 压降 

分 类 号：TL334[核科学技术—核技术及应用] O359[理学—流体力学]