圆管内中低含汽率下临界热流密度的数值预测研究

Theoretical Prediction of Critical Heat Flux Low Intermediate Quality in round Tube

采用汽泡边界层的形成和长大、造成近壁区汽泡雍塞， 从而阻碍汽泡层和主流区的湍流交换的机理， 建立了圆管中低含汽率临界热流密度（ＣＨＦ） 的预测理论模型。经过与Ｔｈｏｍｐｓｏｎ 和ＭａｃＢｅｔｈ的ＣＨＦ 数据库比较， 表明在圆管内中低含汽率工况下， 预测结果和实验数据符合得较好， 本文所提出的模型可用于圆管内中低含汽率工况下ＣＨＦ 值的预测。

A theoretical model is proposed to predict CHF in round tube under the condition of low or intermediate quality, the mechanism adopted is formation and growth of bubble layer resulting in limitation of turbulent enthalpy interchange between the bubbly layer and core regions Agreement is obtained between predictions and experimental data for water flowing in uniformly heated tubes from CHF table compiled by Thompson and MacBeth