CIESC Journal ›› 2005, Vol. 56 ›› Issue (11): 2102-2107.
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ZHANG Hongjian;YUE Weiting;MA Longbo;ZHOU Hongliang
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张宏建;岳伟挺;马龙博;周洪亮
Abstract: The relationship between root-mean-square deviation of fluctuating differential pressure and void fraction of gas-liquid two-phase flow in Venturi tube was investigated.The effect of mass flow rate, pressure, differential pressure and density ratio on the relationship was taken into consideration.With void fraction increasing, the fluctuation of differential pressure signal became stronger firstly and weaker subsequently after it reached a maximum.The experiments were carried out for air-water and oil-air two-phase flow with 40 mm and 50 mm diameter pipes respectively, static pressure less than 0.4 MPa,oil flow rate ranging from 0.97 kg8226;s-1 to 1.81 kg8226;s-1, water flow rate ranging from 1.58 kg8226;s-1 to 2.54 kg8226;s-1.Based on the experimental data and theoretical analysis, a dimensionless correlation between differential pressure and void fraction was proposed. Furthermore,void fraction could be determined with the correlation.The results showed that the void fraction determination error of air-water flow was 10.9% and that of oil-air flow was 11.3%, respectively.
Key words: 气液两相流, 差压波动信号, 空隙率测量, 文丘里管
摘要: 为了研究气液两相流差压波动信号与空隙率之间的关系,建立了差压波动信号均方根与空隙率的关系式.针对油气两相流和气水两相流,在管径分别为40 mm和50 mm管道上进行实验,分析了文丘里管差压波动信号与空隙率、流量、压力以及流体密度等参数的关系,得到了差压波动信号与空隙率的量纲1关系式.此关系式不仅反应了差压波动信号与空隙率的关系,而且提供了一种间接测量空隙率的方法.该方法只需要测量文丘里管前的压力和前后的差压波动信号,计算出该差压信号的时均值、瞬时值就可以计算得到空隙率的值.实验结果表明在空隙率小于85%的范围内,油气两相流和气水两相流空隙率的测量误差分别为10.9%和11.3%.如果与利用空隙率和差压测量气液两相流流量的方法相结合,则仅利用一个文丘里管就可以实现两相流流量测量.
关键词: 气液两相流, 差压波动信号, 空隙率测量, 文丘里管
ZHANG Hongjian, YUE Weiting, MA Longbo, ZHOU Hongliang. Relationship between fluctuating differential pressure and void fraction of gas-liquid two-phase flow in Venturi tube[J]. CIESC Journal, 2005, 56(11): 2102-2107.
张宏建, 岳伟挺, 马龙博, 周洪亮. 文丘里管中气液两相流差压波动信号与空隙率关系 [J]. 化工学报, 2005, 56(11): 2102-2107.
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