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化工进展  2015 

冷热圆管在封闭方腔内不同垂直位置的自然对流数值研究

DOI: 10.16085/j.issn.1000-6613.2015.06.015, PP. 1595-1601

Keywords: 自然对流,方腔,冷热圆管,垂直位置,数值模拟

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Abstract:

利用有限体积法对冷热圆管在封闭方腔内不同垂直位置的自然对流现象进行了数值研究。讨论了瑞利数Ra和冷热圆管间距δ对方腔内自然对流流动与换热的影响,其中瑞利数的变化范围为103~106,圆管间距变化范围为0.3~0.6。为了揭示冷热圆管间的相互作用和圆管与方腔间的相互作用对自然对流换热与流动的影响规律,比较分析了热圆管在上、冷圆管在下和热圆管在下、冷圆管在上两种情形下冷热圆管、方腔的自然对流换热能力的差异。研究表明瑞利数的改变,对方腔内温度场分布和涡流结构有显著影响;热圆管在下、冷圆管在上这种情形更有利于自然对流换热的进行;增加圆管间距δ,热圆管和方腔的换热能力增强,但冷圆管的换热能力却有所减弱。研究结果为核电站安全壳非能动余热排出系统的性能研究提供了理论依据。

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