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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
In order to understand the thermal-hydraulic characteristics of spiral working fluid and analyze the effect of centrifugal force in spiral flow, a two-dimensional mathematical model was developed based on the one-dimensional model by adding the transverse momentum conservation equation. In the conservation equation, the direct calculation of centrifugal force, flow pattern division, heat transfer and flow resistance structure does not require the use of De number (Re d / D) to modify the heat transfer and flow resistance calculation can be directly selected empirical relationship between straight pipe formula. Aiming at the programming of small spiral steam generator used in HTR-10 built by Tsinghua University Institute of Nuclear and New Energy Technology, the steady-state calculation is carried out. The calculation results are within 10% of the experimental results. The two-dimensional mathematical model can theoretically analyze the effect of centrifugal force and the non-axisymmetric distribution of thermal hydraulic parameters