高压工况下管内垂直向上流动沸腾CHF机理模型研究

针对高压工况下偏离泡核沸腾（DNB）型临界热流密度（CHF）的特点，重新构建了Weisman & Pei模型的本构关系式；针对高压工况下干涸（Dry-out）型CHF，比较分析了Kataoka、Celata以及Hewitt?3个沉积率和夹带率计算关系式的结果。基于以上两类改进的CHF模型，建立了一个适用于高压工况的、结合DNB型和Dry-out型沸腾临界机理的CHF模型。采用高压工况下管内垂直向上流动沸腾CHF实验数据对建立的CHF机理模型进行了验证，分析了热工参数和几何参数的趋势效应。 

Study on?CHF Mechanistic?Model in Upflow Boiling Vertical Round Tube under High Pressure

According to the characteristics of DNB type CHF under high pressure, the constitutive correlations?of Weisman & Pei model are?proposed. The prediction results of three entrainment and deposition correlations of Kataoka, Celata and Hewitt corresponding to the Dry-out type CHF are analyzed. Based on the two improved models above, a comprehensive CHF?mechanistic model under high pressure condition combined the DNB and Dry-out type boiling crisis is?established. The verification based on the experiment database of upflow boiling in vertical round tube and the parametric trends analysis of CHF with thermal-hydraulic and geometric parameters are carried out.