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为了扩大现有的临界热流密度(critical heat flux,CHF)流体模化技术的适用范围,提高其预测精度,以制冷剂R134a为介质,对近临界压力区的流动沸腾CHF进行流体模化研究。研究了压力对流动沸腾CHF的影响规律,结果表明,CHF随着压力的升高而降低。基于Ahmad补偿失真模型,在流速模化因子和入口条件模化因子的基础上,引入压力模化因子,对经典流体模化模型进行改进。将CHF查询表的模化结果与R134a流动沸腾CHF实验数据进行比较,结果吻合较好。改进的模化模型适用于近临界压力区,计算结果精度较高,计算也较简单。
In order to expand the application range of the existing critical heat flux (CHF) fluid modeling technology and improve its prediction accuracy, the flow modeling of CHF in the near-critical pressure region was carried out using refrigerant R134a as a medium. The effect of pressure on the flow boiling CHF was studied. The results show that the CHF decreases with the increase of pressure. Based on Ahmad compensation distortion model, the pressure modifier is introduced based on the flow modifier and inlet condition modifier to improve the classical fluid modeling. The results of the comparison between the results of CHF and the experimental data of R134a flow boiling CHF were in good agreement. The improved model is suitable for the near-critical pressure zone, the result of calculation is more accurate and the calculation is simpler.