低品位能源多相流与传热北京市重点实验室(华北电力大学)
纸质出版:2025
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于博文, 徐进良. 超高参数CO2在水平管内流动传热数值模拟研究[J]. 中国电机工程学报, 2025,(14):5392-5402.
于博文, 徐进良. 超高参数CO2在水平管内流动传热数值模拟研究[J]. 中国电机工程学报, 2025,(14):5392-5402. DOI: 10.13334/j.0258-8013.pcsee.241265.
超临界CO
2
强制对流传热已得到广泛研究,但关于其规律和机理的认识仍不完全。该文对高参数超临界CO
2
在内径为8 mm的水平管内传热特性开展数值模拟研究。基于类沸腾理论解释水平管传热恶化机理,获取管内工质在不同截面的超临界三区分布,并讨论不同热流密度和压力对换热的影响规律。结果表明:提高入口温度可减小顶底传热温差并抑制传热恶化的发生;类气膜厚度局部增加导致导热热阻增加是管内发生传热恶化的原因;换热系数随热流密度的增加而减小,提高压力可显著增强管内换热并抑制传热恶化。最后,将模拟结果与经典单相湍流换热关联式和类两相换热关联式对比,发现在类两相区(two-phase-like
TPL)区模拟值与传统公式计算换热系数比(h/h
DB
)值偏离1,越远离TPL区h/h
DB
值越接近1,类两相换热关联式可较好的预测超临界类沸腾干度x在0~1之间的换热系数,模拟值与cheng公式计算换热系数h/h
c
偏差在±30%以内。研究结果对超临界CO
2
发电系统安全稳定的运行和换热器的设计以及实际工程应用中换热系数的预测具有一定意义。
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