螺旋管蒸汽发生器热工流体力学二维模型

为了解螺旋管中流动工质的热工水力特性 ,分析螺旋流动中离心力的作用 ,在一维模型的基础上 ,添加了横向动量守恒方程 ,发展为二维数学模型。在守恒方程中直接计算离心力项 ,流型划分、传热和流动阻力结构关系式中不需采用 De数 (Re d/ D)进行修正 ,传热和流动阻力计算可直接选用直管的经验关系式。针对清华大学核能与新能源技术研究院建造的 HTR- 10中所采用的小螺旋管式蒸汽发生器编制程序 ,进行稳态计算 ,计算结果与实验结果误差在 10 %以内。二维数学模型可以从理论上分析离心力的作用及热工水力参数分布的非轴对称性

2-D model for thermal-hydraulic analysis of helical-tube generators

The thermal-hydraulic of the flow in helical-tube steam generators was analyzed using a one-dimensional model. An essentially two-dimensional model was given with a radial momentum conservation equation. The centrifugal force and the non-axially symmetric thermal-hydraulic effects are modelled theoretically in the two-dimensional model. Since the centrifugal force is calculated directly in the conservation equations, the De number (Red/D) is not used to calculate the heat transfer or pressure drop. Empirical formula for the heat transfer and pressure drop in straight tube can then be used directly for helical tube in the two-dimensional model. Use of this model to analyze the HTR-10 steam generator has calculational errors of less than 10%.