基于分相流模型的棒束通道内两相流阻力特性研究

摘要

以空气和水为介质,对常温常压下3×3棒束通道中的两相流阻力特性进行研究,选取5种常见分相流模型对棒束通道中两相流摩擦压降进行预测,并基于Lee-Lee模型,以分相流模型中的参数C为核心参数,提出适用于棒束通道的经验关系式.结果表明:Chisholm模型预测分散度较大,但平均相对误差较小,可用于棒束通道内两相流摩擦压降的粗略估计;Mishima-Hibiki模型和Zhang-Mishima模型都基于小通道或者窄通道,在不同流型中误差也均在30％以上;Sun-Mishima模型的经验关系式涉及的影响因素较多,在棒束通道的适用性较差;修正后的模型预测值与实验值符合程度较高.%The flow resistance of air-water two-phase flow in a 3 × 3 rod bundle was experinentally investi gated at ambient temperature and pressure.Five normally used separated models were chosen to predict the frictional pressure drop in the rod bundle,after which,an empirical formula was proposed for calculating the parameter C in the Lee-Lee model.Results show that the prediction values of Chisholm model are greatly dispersed,but the average error is relatively small,which can be used to estimate the frictional pressure drop of two-phase flow in rod bundle channels.The prediction errors of Mishima-Hibiki and Zhang-Mishima model are all above 30％ for different flow patterns,because these models are set up for small or micro-channels.The Sun-Mishima model has poor adaptability to rod bundle channels,since too many influence factors are involved in its empirical formula.In addition,the prediction results of modified Lee-Lee model agree well with experimental data.