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一、引言两相湍流交混不论是对反应堆堆芯的稳态热工设计还是事故分析都是十分重要的。然而,由于两相湍流交混的机理非常复杂,以及实验的难度很大,至今尚缺乏能够精确计算子通道间两相湍流交混量的成熟的经验或半经验关系式。1972年,Beus根据别人的实验数据,导出了一个计算两相湍流交混的关系式,他把整个两相流动工况分为两区,在交混峰值之前是搅拌混合区,认为该区内的两相湍流交混主要是由于汽泡和汽团的搅拌作用所支配,峰值之后是环状流下的过渡混合区,在该区内,用双曲线来拟合实验数据,峰值出现在块状流向环状流过渡的转变点处。在他的模型当中,没有考虑间隙等参数对交混的影响,用双曲线来拟合环状流区域内的交混也是不够理想的。本文提供
I. INTRODUCTION Two-phase turbulent mixing is of great importance both for the steady-state thermal design of the reactor core and for accident analysis. However, due to the complex mechanism of the two-phase turbulent mixing and the difficulty of experiments, there is still no mature empirical or semi-empirical relationship that can accurately calculate the mixing amount of two-phase turbulence between subchannels. In 1972, Beus derived a set of equations for calculating the two-phase turbulence mixing based on experimental data from other people. He divided the two-phase flow into two zones. Before the peak of mixing, The two-phase turbulent mixing is dominated by the mixing action of the bubble and the steam mass, and the peak is followed by the transitional mixing zone of the annular flow where the hyperbolic curves are used to fit the experimental data and the peaks appear in the massive The transition to the annular flow transition point. In his model, the effect of parameters such as clearance on the mixing is neglected. It is also not ideal to use hyperbola to fit the mixing in the annular flow. This article provides