基于弹状流和搅拌流的气力提升泵建模

Model for airlift pumps based on slug-churn flow

针对传统的理论模型适应范围较窄、精度不高的问题,提出基于弹状流和搅拌流的气力提升泵理论建模。针对弹状流和搅拌流工况,分别建立提升泵气液速度模型、相含率模型以及压降模型,采用临界气含率判别气力提升泵流动工况,结合气液连续性方程和动量方程,建立了气力提升泵的完整理论模型。研究结果表明:该模型能较好地适应提升泵内弹状流与搅拌流工况,在弹状流-搅拌流过渡区域出现较大的误差,最大误差为11%;与传统理论模型相比,基于弹状流和搅拌流的理论模型适应范围广,预测精度高。

A new theoretical model for airlift pumps based on slug and churn flow was proposed due to the problems of narrow application range and low accuracy of traditional theoretical models.Firstly,the phase velocities,the void fraction,and the pressure gradient for slug flow and churn flow were deduced,respectively.A critical void fraction was employed for judging the flow regime in airlift pumps.Then,a closed model for airlift pumps was developed based on the gas-liquid continuity and momentum equations.The results show that the new model can adapt to the slug flow and churn flow in airlift pumps and has a maximal error of 11%in the slug-churn transition flow.Compared with the traditional models,the new model has a wide range of gas flow rate and high prediction accuracy.