Analytical Investigation of Expansion Waves in Two-phase Flows with Different Sound Speeds
Analytical Investigation of Expansion Waves in Two-phase Flows with Different Sound Speeds
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不同声速两相流中膨胀波的解析研究
DOI：
10.11368/tse.24.1
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
中川勝文
中科院分区：
文献类型：
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作者：
川村洋介;中川勝文
近年来，随着使用两相流喷射器的制冷空调系统和热泵系统的出现，与传统系统相比，循环效率已大大提高。在喷射器的混合段，亚音速单相气态制冷剂的吸入流从超音速两相制冷剂的驱动流的外侧流过。在这些流场中，可能会出现影响喷射器性能的冲击波和膨胀波;因此，在设计喷射器系统时必须考虑这些影响。在这项研究中，膨胀波产生的流场具有不同的声速解析研究通过改变动量和热弛豫时间。根据分析结果，我们成功地制作了在两相流和单相气流的流场中出现的膨胀波，即使单相气流是亚音速的。亚音速状态下膨胀波的存在是由于单相气流中相间的弛豫现象和拟收敛喷管效应造成的。研究结果为我们更好地理解喷射器混合段的流体流动现象提供了线索。
Recently, by the appearance of the refrigeration air conditioning system and heat pump system using the two-phase flow ejector, the efficiency of the cycle has been largely improved in comparison with the conventional system. In mixing section of the ejector, the suction flow of the subsonic single-phase gas refrigerant flows through the outside of the driving flow of the supersonic two-phase refrigerant. Within these flow fields, shock and expansion waves that affect the performance of the ejector can occur; therefore, such effects must be taken into account in the design of the ejector system. In this study, the expansion waves generated in flow fields with different speeds of sound are researched analytically by changing the momentum and thermal relaxation times. From analysis results, we successfully made expansion waves which occur in the flow field with two-phase flow and single phase gas flow, even though single-phase gas flows were subsonic. The reason, why expansion waves exist in subsonic state is due to the relaxation phenomena between the phases and the pseudo-like-convergent nozzle effect in the single-phase gas flow. The results of this study provide a clue that can help us better understand fluid flow phenomena in the mixing section of the ejector.