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化工学报  2012 

压缩/喷射制冷循环中两相喷射器性能

DOI: 10.3969/j.issn.0438-1157.2012.10.013, PP. 3094-3100

Keywords: 压缩/喷射,两相喷射器,壅塞,凝结激波,混合压力

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Abstract:

考虑引射流体的壅塞现象和混合室内的凝结激波现象,对混合室采用恒面积混合模型,应用质量守恒、动量守恒和能量守恒对两相喷射器建立了热力学模型。以R141b为工质,研究了在不同混合压力条件下喷射器内的压力变化趋势,分析了混合压力对系统性能、喷射器喷射系数和出口压力的影响,探讨了喷射器最优引射室压降、系统最优性能系数及相应的性能提高率随冷凝温度和蒸发温度的变化情况。结果表明:在本文计算工况范围内,两相喷射器混合室内无凝结激波的发生;对混合室采用恒面积混合模型相比等压混合模型更合理;恰当选择混合压力对优化系统的性能非常重要,其最佳值略低于引射流体压力,而远高于引射流体的临界压力,且其对应于喷射器取得最高的喷射系数。

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