【摘要】 利用气液二相流一维波模型和段塞稳定性模型,对直径2.54 cm水平管内空气-水二相流出现段塞流时的各相临界表观速度和临界液层高度进行了理论预测。计算中发现,2种模型分别适用于不同的流速区域,在较低的气相流速下,一维波模型的预测结果比较理想,但是在较高的气速条件下不太适合,而利用段塞稳定性模型可以较好地获得高流速下分层流向段塞流的流型转变条件。因此,结合这2种模型对发生流型转变时的临界参数作了分析,并且应用于40 mm和50 mm水平管道的油气二相流实验。将理论计算的结果和实验测得的流型数据进行了对比,并且对影响流型的管径、流速等因素作了分析,结果表明计算得到的特征参数和实验数据比较吻合。更多还原

【Abstract】 A theoretical model was presented to predict transition from the stratified patterns to slug flow for gas-liquid flow in horizontal 2.54 cm pipe by using onedimensional wave model combined with slug stability model.The results of prediction were compared with the experimental data reported by previous literature.The comparison shows that these two models are applicable for different ranges of gas flow rates respectively.At low gas velocities,one-dimensional wave model works well,but is not suitable for high gas flow rates,while slug stability model can provide better prediction of the critical liquid heights and the critical superficial velocities for the transition to a slug flow.This combined model was applied to the experiment of oil-gas two-phase flow in horizontal 40 mm and 50 mm pipes.The characteristic parameters were calculated and correct curves of flow regime transition were obtained.The results show that this model gives a reasonable prediction over the whole range of flow rates,and better agreement is achieved between predicted and measured critical parameters.更多还原