New model for measuring stratified gas-liquid flow by Chisholm-model-based V-cone flowmeter

doi:10.11949/j.issn.0438-1157.20180136

Abstract

Abstract:

Large errors are usually observed when Chisholm model is used in V-cone flowmeter to measure stratified gas-liquid flow rate. Three V-cone flowmeters with throttle ratios of 0.55, 0.65 and 0.75 were used to study stratified gas-liquid flow at gas volume fraction of more than 95%. The effects of gas and liquid flow rates, operating pressure and throttle ratio on correction factor C of the Chisholm model were analyzed and new model for measuring stratified gas-liquid flow was developed. Correction factor C was monotonically decreased with increase of Lockhart-Martinelli, X_LM, but was hardly affected by pressure and the gas densiometric Froude number. However, C was somehow affected by throttle ratio. The relationship between C and X_LM was obtained and new models for three V-cone flowmeters to measure stratified flow were developed. The relative standard error of the predicted gas flow rate was with ±3.0% for V-cone flowmeters with throttle ratios of 0.55 and 0.65 under confidence level of 94.6% and 88.6%, respectively, while that was with ±4.0% under 91.7% confidence level for V-cone flowmeter with throttle ratio of 0.75.

Key words: multiphase flow, two-phase flow, stratified gas-liquid flow, measurement, Chisholm model, V-cone flowmeter

摘要：

针对V锥流量计应用Chisholm模型测量气液分层流时误差较大的问题，采用节流比分别为0.55、0.65和0.75的三个V锥流量计，实验研究了高含气率（体积含气率>95%）气液分层流条件下，气、液相流量、压力以及节流比对Chisholm模型修正因子C的影响规律，并建立气液分层流测量模型。结果表明，修正因子C随Lockhart-Martinelli参数X_LM的增大而单调递减，但基本不受压力和气体密度Froude数的影响，而节流比变化则对C有一定影响；建立了C随X_LM变化的测量模型，获得了不同节流比的V锥流量计气液分层流测量新模型。对于节流比为0.55和0.65的V锥流量计，分别在94.6%和88.6%置信水平下，新模型预测的气相流量相对误差不超过±3.0%；节流比为0.75时，在91.7%置信水平下，预测的气相流量相对误差不超过±4.0%。

关键词: 多相流, 两相流, 气液分层流, 测量, Chisholm模型, V锥流量计

CLC Number:

TK313

HE Denghui, CHEN Senlin, BAI Bofeng. New model for measuring stratified gas-liquid flow by Chisholm-model-based V-cone flowmeter[J]. CIESC Journal, 2018, 69(8): 3428-3435.

贺登辉, 陈森林, 白博峰. 基于Chisholm模型的V锥流量计气液分层流测量新模型[J]. 化工学报, 2018, 69(8): 3428-3435.

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