A novel self-seeding method for particle image velocimetry measurements of subsonic and supersonic flows
A self-seeding particle method is proposed for particle image velocimetry measurements in closed cycles such as Organic Rankine Cycles. Condensed droplets of vapor are used as tracers in a closed cycle for both subsonic and supersonic regimes. A free jet of R245fa in the vapor phase is examined in a...
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| Veröffentlicht in: | Scientific reports 2020-07, Vol.10 (1), p.10834-10834, Article 10834 |
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| creator | Nematollahi, Omid Samsam-Khayani, Hadi Nili-Ahmadabadi, Mahdi Yoon, Sang Youl Kim, Kyung Chun |
| description | A self-seeding particle method is proposed for particle image velocimetry measurements in closed cycles such as Organic Rankine Cycles. Condensed droplets of vapor are used as tracers in a closed cycle for both subsonic and supersonic regimes. A free jet of R245fa in the vapor phase is examined in a case study with two different nozzle pressure ratios of 5.1 and 2.1 to evaluate the tracer particles in both supersonic and subsonic conditions. A simple turbulent jet in subsonic conditions and an under-expanded jet are observed in high supersonic conditions. The flow structures of the under-expanded jet are captured using the proposed method, and vivid images of the Mach disk and shock cells are obtained. A series of Schlieren photography experiments are performed to validate the proposed method. The results show that the method can be a good candidate for tracer particles in the closed cycles where condensation of the working fluid is possible. |
| doi_str_mv | 10.1038/s41598-020-67680-5 |
| format | Article |
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| subjects | 639/166/4073 639/166/988 Cameras Case studies Design Humanities and Social Sciences Lasers Mechanical engineering multidisciplinary Photography Science Science (multidisciplinary) Tracers Vapors |
| title | A novel self-seeding method for particle image velocimetry measurements of subsonic and supersonic flows |
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