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Starting transient flows in a chevron ejector-diffuser system

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Abstract

The vacuum ejector-diffuser system has been widely used in many applications such as refrigeration systems, high altitude test facilities and fluid transportation devices. We simulated the starting transient flows of a supersonic vacuum ejector-diffuser system and its performance characteristics and analyzed by the numerical methods. Newly designed chevron lobes were installed at the inlet of the primary stream of the vacuum ejector-diffuser system for the purpose of its performance improvement. A CFD method based on transient scheme was applied to simulate the equilibrium flow behavior inside the secondary chamber. Primary numerical analysis results show that the performance of the vacuum ejector-diffuser system is considerably improved under chevron effects. Compared to the conventional ejector-diffuser system with a convergent nozzle, the updated system with a chevron nozzle leads to a lower equilibrium pressure inside the secondary chamber with less starting time. The flow characteristics obtained from the numerical results highlight the importance of the vortex generation effects of the chevron nozzle. The generation process of the longitudinal vortexes and its effects on the ejector-diffuser performance has been discussed in detail.

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Authors and Affiliations

  1. School of Mechanical Engineering, Andong National University, Andong, 760-749, Korea

    Fanshi Kong & Heuy Dong Kim

  2. Department of Mechanical Engineering, Saga University, Saga, Japan

    Toshiaki Setoguchi

  3. School of Mechanical Engineering, Pukyong National University, Pusan, Korea

    Jeong Soo Kim

Authors
  1. Fanshi Kong
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  2. Heuy Dong Kim
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  3. Toshiaki Setoguchi
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  4. Jeong Soo Kim
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Corresponding author

Correspondence to Heuy Dong Kim.

Additional information

This paper was presented at the AJCPP-2014, Jeju Grand Hotel, Jeju, Korea, March 5–8, 2014. Recommended by Guest Editor Heuy Dong Kim

Heuy Dong Kim received his B.S. and M.S. degrees in Mechanical Engineering from Kyungpook National University, Korea, in 1986 and 1988, respectively. He then received his Ph.D. from Kyushu University, Japan, in 1991. Dr. Kim is currently a Professor at the School of Mechanical Engineering, Andong National University, Korea. His research interests include high-speed trains, ramjet and scramjet, shock tube and technology, shock wave dynamics, explosions and blast waves, flow measurement, aerodynamic Noises, and Supersonic Wind Tunnels.

Fanshi Kong received his M.S. degrees in Mechanical Engineering from Zhejiang Sci & Tech University, China and Andong National University, Korea at 2013. He is a Ph.D. candidate in Andong National University, Korea. His research interests include supersonic ejector-diffuser system, aerodynamics, compressible gas dynamics and shock wave dynamics.

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Kong, F., Kim, H.D., Setoguchi, T. et al. Starting transient flows in a chevron ejector-diffuser system. J Mech Sci Technol 29, 887–892 (2015). https://doi.org/10.1007/s12206-015-0201-3

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  • DOI: https://doi.org/10.1007/s12206-015-0201-3

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