The Critical Heat Flux (CHF) prediction under high pressure condition, even close to the vicinity of the critical pressure of water, is an important issue. Although there are many empirical CHF correlations, most of them have covered the pressure under 15MPa. In this study, based on the CHF experiment database of upflow boiling in vertical round tube from 15MPa to the vicinity of the critical pressure of water, the Katto, Bowring, Hall-Mudawar, Alekseev correlations, and Groeneveld LUT-2006 are comparatively studied. With an error analysis of the predicted CHF to the experiment database, the prediction capability and the applicability of these correlations are evaluated and the parametric trends of CHF varying with pressure from 15MPa to critical pressure are proposed. Simultaneously, according to the characteristics of Departure from Nucleate Boiling (DNB) type CHF under high pressure condition, 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 (DO) type CHF are analyzed. Based on the two improved models above, a comprehensive CHF mechanistic model under high pressure condition combining the DNB and DO type CHF is established. The verification based on the experiment database of upflow boiling in vertical round tube and the parametric trends analysis of CHF varying with thermal-hydraulic and geometric parameters are carried out. Findings of this study have a positive effect on further development of CHF prediction method for universal CHF mechanism, especially under high pressure region.

中文翻译：

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高压上流沸腾立式圆管临界热流研究

高压条件下（甚至接近水的临界压力附近）的临界热通量（CHF）预测是一个重要问题。尽管有许多经验上的CHF相关性，但大多数都涵盖了15MPa以下的压力。在这项研究中，基于竖向圆管从15MPa到水的临界压力附近上流沸腾的CHF实验数据库，对Katto，Bowring，Hall-Mudawar，Alekseev相关性和Groeneveld LUT-2006进行了比较研究。通过对实验CHF的误差分析到实验数据库，评估了这些相关性的预测能力和适用性，并提出了CHF随压力从15MPa到临界压力变化的参数趋势。同时，根据高压条件下核沸腾离（DNB）型CHF的特征，提出了Weisman＆Pei模型的本构关系。分析了干tao（DO）型CHF对应的Kataoka，Celata和Hewitt三种夹带和沉积相关性的预测结果。在以上两个改进模型的基础上，建立了将DNB和DO型CHF相结合的高压条件下的综合CHF机理模型。基于立式圆管上流沸腾实验数据库进行了验证，并对CHF随热工和几何参数变化的参数趋势进行了分析。这项研究的发现对进一步开发通用CHF机制的CHF预测方法有积极的影响，