Experimental study on the pressure fluctuation caused by two-phase flow shock wave at the nozzle outlet
Recently, the refrigeration air conditioner and heat pump system using the two-phase flow ejector is beginning to appear, as the efficiency of the ejector cycle is improved largely in comparison with the conventional system. Shock and expansion waves can occur in the internal flow fields of the ejec...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2017-07-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/83/851/83_17-00192/_pdf/-char/en |
| _version_ | 1797989028841127936 |
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| author | Haruyuki NISHIJIMA Kazuyoshi SADAMURA Yosuke KAWAMURA Masafumi NAKAGAWA |
| author_facet | Haruyuki NISHIJIMA Kazuyoshi SADAMURA Yosuke KAWAMURA Masafumi NAKAGAWA |
| author_sort | Haruyuki NISHIJIMA |
| collection | DOAJ |
| description | Recently, the refrigeration air conditioner and heat pump system using the two-phase flow ejector is beginning to appear, as the efficiency of the ejector cycle is improved largely in comparison with the conventional system. Shock and expansion waves can occur in the internal flow fields of the ejector, and the effect of the pressure fluctuation by those waves must be considered on the designs of the ejector. In this study, the pressure fluctuation of the shock wave appeared at the outlet of the two-phase flow nozzle are measured in the HFO1234yf refrigeration cycle. It was clarified by experiment that the amplification frequency components of pressure fluctuations are increased with the strength of the shock waves and the attenuation frequency components are increased with increase of liquid void fraction of downstream shock waves. |
| first_indexed | 2024-04-11T08:12:34Z |
| format | Article |
| id | doaj.art-77278517919244abacf7537b2ff27ec3 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T08:12:34Z |
| publishDate | 2017-07-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-77278517919244abacf7537b2ff27ec32022-12-22T04:35:16ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612017-07-018385117-0019217-0019210.1299/transjsme.17-00192transjsmeExperimental study on the pressure fluctuation caused by two-phase flow shock wave at the nozzle outletHaruyuki NISHIJIMA0Kazuyoshi SADAMURA1Yosuke KAWAMURA2Masafumi NAKAGAWA3Department of Mechanical Engineering, Graduate school, Toyohashi University of TechnologyDepartment of Mechanical Engineering, Graduate school, Toyohashi University of TechnologyDepartment of Mechanical Engineering, Toyohashi University of TechnologyDepartment of Mechanical Engineering, Toyohashi University of TechnologyRecently, the refrigeration air conditioner and heat pump system using the two-phase flow ejector is beginning to appear, as the efficiency of the ejector cycle is improved largely in comparison with the conventional system. Shock and expansion waves can occur in the internal flow fields of the ejector, and the effect of the pressure fluctuation by those waves must be considered on the designs of the ejector. In this study, the pressure fluctuation of the shock wave appeared at the outlet of the two-phase flow nozzle are measured in the HFO1234yf refrigeration cycle. It was clarified by experiment that the amplification frequency components of pressure fluctuations are increased with the strength of the shock waves and the attenuation frequency components are increased with increase of liquid void fraction of downstream shock waves.https://www.jstage.jst.go.jp/article/transjsme/83/851/83_17-00192/_pdf/-char/enmultiphase flowsupersonic flowshock wavesejectorpressure fluctuationhfo1234yf |
| spellingShingle | Haruyuki NISHIJIMA Kazuyoshi SADAMURA Yosuke KAWAMURA Masafumi NAKAGAWA Experimental study on the pressure fluctuation caused by two-phase flow shock wave at the nozzle outlet Nihon Kikai Gakkai ronbunshu multiphase flow supersonic flow shock waves ejector pressure fluctuation hfo1234yf |
| title | Experimental study on the pressure fluctuation caused by two-phase flow shock wave at the nozzle outlet |
| title_full | Experimental study on the pressure fluctuation caused by two-phase flow shock wave at the nozzle outlet |
| title_fullStr | Experimental study on the pressure fluctuation caused by two-phase flow shock wave at the nozzle outlet |
| title_full_unstemmed | Experimental study on the pressure fluctuation caused by two-phase flow shock wave at the nozzle outlet |
| title_short | Experimental study on the pressure fluctuation caused by two-phase flow shock wave at the nozzle outlet |
| title_sort | experimental study on the pressure fluctuation caused by two phase flow shock wave at the nozzle outlet |
| topic | multiphase flow supersonic flow shock waves ejector pressure fluctuation hfo1234yf |
| url | https://www.jstage.jst.go.jp/article/transjsme/83/851/83_17-00192/_pdf/-char/en |
| work_keys_str_mv | AT haruyukinishijima experimentalstudyonthepressurefluctuationcausedbytwophaseflowshockwaveatthenozzleoutlet AT kazuyoshisadamura experimentalstudyonthepressurefluctuationcausedbytwophaseflowshockwaveatthenozzleoutlet AT yosukekawamura experimentalstudyonthepressurefluctuationcausedbytwophaseflowshockwaveatthenozzleoutlet AT masafuminakagawa experimentalstudyonthepressurefluctuationcausedbytwophaseflowshockwaveatthenozzleoutlet |