微重力条件下气／液两相流压降实验研究

利用俄罗斯IL-76失重飞机对微重力条件下方形截面管道内的水/气两相流压降进行了实验研究．利用本次微重力气／液两相流压降实验结果对一些目前常用的基于地面常重力实验结果的两相流压降预测模型(均相模型、Lockhart-Martinelli—Chisholm模型和Friedel模型)在微重力条件下的适用性进行了评估．比较发现，均相模型和Lockhart-Martinelli—Chisholm模型预测结果和实验数据差异很大；而Friedel模型的预测结果尽管也与实验数据有着明显的差别，但在这些模型中是误差最小的．因此，可以利用Friedel模型来对微重力气／液两相流压降进行初步预估，而新的、更精确的模型将依赖于更有物理意义的分析方法及不同重力条件下气／液两相流压降实验的结果．

Experimental Study on Pressure Drop of Two-phase Gas-liquid Flow at Microgravi ty Conditions

Experimental studies have been performed on the board of Russian IL 76 reduced gravity airplane for two phase air water pressure drops in a square cross section channel. Some widely used models, such as the homogenous, Lockhart Martinelli Chisholm and Friedel models, which are built on a foundation of a large empirical database developed with the aid of numerous meticulous experiments on Earth, are evaluated using the present experimental data. It is found that very large differences exist between the experimental data and the predictions of the homogenous model and the Lockhart Martinelli Chisholm model, while the Friedel model provides the best agreement with the experimental data among these models, although an obvious error still exists. Thus the Friedel model can be used to estimate preliminarily the two phase pressure drops at microgravity conditions. A more accurate model should be developed based on a more physical analysis and a large empirical database developed with the aid of numerous meticulous experiments at normal and reduced gravity conditions.