气液两相流压降倍率实验研究
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摘要
设计了实验装置,基于文丘里管差压信号计算了气相压降倍率,分析了弗劳德数、Lockhart-Martinelli参数、流型对气相压降倍率的实验影响。利用流型和弗劳德数修正了Murdock模型,并与分相模型、均相模型、Murdock模型、James模型等进行了实验对比。由于考虑了流型对气相压降倍率的影响,建立的实验相关式精度较高,参数估计结果较好。实验研究表明,模型中斜率的修正系数随含气率的增大而逐渐增大,截距修正系数随含气率的增大而逐渐减小。在环状流型下,气相压降倍率的实验估计误差最小;在泡状流实验工况下,估计误差较小;在塞状流实验工况下,气相压降倍率的估计误差较大。建立的压降关系式可用于气液两相测试分析的实验教学和相关领域。
Experimental equipment is designed for the pressure drop multiplier analysis. Based on the differential pressure signal from a Venturi tube,the two-phase pressure drop multiplier was calculated. The experimental influences of Froude number,Lockhart-Martinelli parameter and flow pattern on the two-phase pressure drop multiplier were analyzed. Flow pattern and Froude number are considered as variables to modify the Murdock correlation. Compared with homogeneous flow model,separated flow model,Murdock model and James model,the correlation proposed in this paper provides a more accurate pressure drop multiplier value because the flow pattern as an important factor is considered. The experimental research showed that the modified slope increases versus the void fraction increasing and the modified intercept decreases versus the void fraction increasing. The experimental results also show that the proposed correlation estimates the multiplier more accurate for the annular flow than for the bubble flow,and the estimation error is larger for the slug flow. The established pressure drop correlation is simple,accurate and suitable for various flow patterns. It can be used in the experimental teaching,scientific research and related industrial fields.
Experimental equipment is designed for the pressure drop multiplier analysis. Based on the differential pressure signal from a Venturi tube,the two-phase pressure drop multiplier was calculated. The experimental influences of Froude number,Lockhart-Martinelli parameter and flow pattern on the two-phase pressure drop multiplier were analyzed. Flow pattern and Froude number are considered as variables to modify the Murdock correlation. Compared with homogeneous flow model,separated flow model,Murdock model and James model,the correlation proposed in this paper provides a more accurate pressure drop multiplier value because the flow pattern as an important factor is considered. The experimental research showed that the modified slope increases versus the void fraction increasing and the modified intercept decreases versus the void fraction increasing. The experimental results also show that the proposed correlation estimates the multiplier more accurate for the annular flow than for the bubble flow,and the estimation error is larger for the slug flow. The established pressure drop correlation is simple,accurate and suitable for various flow patterns. It can be used in the experimental teaching,scientific research and related industrial fields.
引文
[1]袁春飞,仇小杰.超燃冲压发动机研究现状及控制系统关键技术[J].航空发动机,2016,42(4):1-7.
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[8]Murdock J W.Two-phase flow measurement with orifice[J].Journal of Basic Engineering,1962,84(4):419-433.
[9]James R.Metering steam-water two-phase by sharp-edged orifices[J].Proceeding of the Institution of Mechanical Engineers,1956,180(23):549-566.
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[11]申国强,林宗虎.应用动态法进行气液两相流的双参数测量[J].计量学报,1993,14(2):140-145.
[12]Xu L J,Xu J,Dong F,et al.On fluctuation of the dynamic differential pressure signal of Venturi meter for wet gas metering[J].Flow Measurement and Instrumentation,2003,14(4-5):211-217.
[13]Konishi C A,Qu W L.Toward a generalized correlation for liquidvapor two-phase frictional pressure drop across staggered micro-pinfin arrays[J].International Communications in Heat and Mass Transfer,2016(75):253-261.
[14]Li D.Research of characteristics of gas-liquid two-phase pressure drop in microreactor[C]//MATEC Web of Conferences.EDP Sciences,2015:25.
[15]Gupta B,Nayak A K,Kandar T K,et al.Investigation of air-water two phase flow through a venture[J].Experimental Thermal and Fluid Science,2016(70):148-154.
[16]Hewitt G F.Measurement of two phase flow parameters[M].London:Academic Press,1978:60-75.
[2]吴立刚,安昊,刘健行,等.吸气式高超声速飞行器控制的最新研究进展[J].哈尔滨工业大学学报,2016,48(10):1-16.
[3]孔海利,郭宪民,李添龙,等.可调式引射器对两相流引射制冷循环系统性的影响[J].低温与超导,2014,42(3):48-52.
[4]张树文,张忻.气液两相流实验的改进[J].实验室研究与探索,2000(6):43-45.
[5]王微微,陈静静,孙峰超.基于科氏质量流量计的两相流计量方法研究[J].测井技术,2016,40(2):167-170.
[6]Jagan V,Satheesh A.Experimental studies on two phase flow patterns of air-water mixture in a pipe with different orientations[J].Flow Measurement and Instrumentation,2016,52:170-179.
[7]Roman A J,Kreitzer P J,Ervin J S,et al.Flow pattern identification of horizontal two-phase refrigerant flow using neural networks[J].International Communications in Heat and Mass Transfer,2016,71:254-264.
[8]Murdock J W.Two-phase flow measurement with orifice[J].Journal of Basic Engineering,1962,84(4):419-433.
[9]James R.Metering steam-water two-phase by sharp-edged orifices[J].Proceeding of the Institution of Mechanical Engineers,1956,180(23):549-566.
[10]Lin Z H.Two-phase flow measurements with sharp-edged orifice[J].International Journal of Multiphase Flow,1992,8(6):683-693.
[11]申国强,林宗虎.应用动态法进行气液两相流的双参数测量[J].计量学报,1993,14(2):140-145.
[12]Xu L J,Xu J,Dong F,et al.On fluctuation of the dynamic differential pressure signal of Venturi meter for wet gas metering[J].Flow Measurement and Instrumentation,2003,14(4-5):211-217.
[13]Konishi C A,Qu W L.Toward a generalized correlation for liquidvapor two-phase frictional pressure drop across staggered micro-pinfin arrays[J].International Communications in Heat and Mass Transfer,2016(75):253-261.
[14]Li D.Research of characteristics of gas-liquid two-phase pressure drop in microreactor[C]//MATEC Web of Conferences.EDP Sciences,2015:25.
[15]Gupta B,Nayak A K,Kandar T K,et al.Investigation of air-water two phase flow through a venture[J].Experimental Thermal and Fluid Science,2016(70):148-154.
[16]Hewitt G F.Measurement of two phase flow parameters[M].London:Academic Press,1978:60-75.