水平管气液段塞流流量瞬变特性模拟研究

以Taitel 和Barnea(1998,1999)提出的段塞流跟踪模型为基础,进一步考虑加速压降的影响,建立了新的瞬态段塞流跟踪模型,并采用面向对象技术编制了数值模拟软件,实现了数值跟踪。计算结果与King等的段塞流气体流量瞬变实验数据对比表明,瞬态跟踪模型较好地预测了气体流量上升造成的段塞流压力“过升”现象,以及长液塞的出现;当气体流量下降时出现的压力“过降”现象和短暂分层流现象也由模型准确预测,分析认为,由于段塞流压降远高于分层流型,因此大部分液塞消失而出现的短暂分层流导致了压力过降。

SIMULATION OF THE FLOWRATE TRANSIENTS CHARACTERISTICS OF GAS-LIQID SLUG FLOW IN HORIZONTAL PIPELINE

A new dynamic model for transient slug tracking was developed in which the acceleration pressure drop was considered. This model was implemented with OOP technique and then the front and tail of each slug and long bubble were tracked numerically. Compared to the experimental results of King et al., this model can correctly predict not only the phenomena of the pressure overshoot above the value of the new steady state and the formation of long slugs when the gas flowrate was increased, but also the phenomena of the pressure undershoot and a short period of stratified flow when the gas flowrate was decreased. From the simulation, it is found that the temporary stratified flow caused by the disappearing of most slugs leads to the pressure undershoot, because the pressure gradient in stratified flow is far less than that in slug flow.