Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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The evaluation of performance and flow characteristics due to the length of throat and diffuser for ship's ejector

선박용 Ejector의 직관부와 디퓨저 길이 변화에 따른 성능비교 및 유동특성에 관한 연구

  • Lee, Young-Ho (Division of Mechanical and Energy Systems Engineering, Korea Maritime and Ocean University) ;
  • Kim, Mun-Oh (Department of Marine System Engineering, Korea Maritime and Ocean University) ;
  • Kim, Chang-Goo (Department of Mechanical and Energy Systems Engineering, Korea Maritime and Ocean University) ;
  • Kim, You-Taek (Division of Marine System Engineering, Korea Maritime and Ocean University)
  • Received : 2013.09.25
  • Accepted : 2013.12.27
  • Published : 2014.01.31
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Abstract

Ejector is a simple device which can transport a low-pressure secondary flow by using a high-pressure primary flow. The efficiency of the ejector system is relatively very low, compared to other fluid transport devices driven mainly by the forces acting on the normal direction. However, its major advantage is a simple structure with no moving parts, and it transports a large amount of fluid with a small driving energy. In this study, the performance of side-type liquid ejector commonly used in ships; is analyzed by using experimental and CFD methods under steady and incompressible flow condition by varying the length of the throat and diffuser, the flow pattern and suction phenomenon were studied in detail.

이젝터는 고압의 주유동을 통해 저압의 부유동을 이동시키는 단순한 장치이다. 이젝터의 효율은 주방향으로 작동하는 다른 이송 장치에 비해 매우 낮다. 그러나 구동장치가 없어 간단한 구조를 가지고 있으며, 낮은 구동에너지로 많은 양의 유체를 이송시킬 수 있는 장점을 가지고 있다. 본 연구에서는 선박에서 많이 사용되고 있는 side-type 액체용 이젝터에 작동유체의 유량을 변화시키면서 정상, 비압축성 유동에 대해 실험 및 CFD 분석을 통하여 직관부 및 디퓨저의 길이변화에 따른 이젝터의 유동 패턴과 흡입 현상을 분석하였다.

Keywords

References

  1. Y. H. Lee, Y. S. Shin, H. M. Jeong, and H. S. Chung, "A study on the ejector performance by outlet diffuser shape", Proceeding of the SAREK 2002 Winter Annual Conference, pp. 308-313, 2002.
  2. G. Fluegel, "Berechnung von strahlapparaten," VDI Forschungsheft 395 Ausgabe B Band 10, 1939.
  3. D. W. Sun and I. E. Eames, "Recent developments in the design theoreis and applications of ejectors a review", Journal of Institute Energy, vol. 68, pp. 665-676, 1995.
  4. J. H. Witte, "Efficiency and design of liquid- gas ejector", British Chemical Engineering, vol. 10, no. 9, pp. 602-607, 1965.
  5. M. N. Biswas and A. K. Mitra, "Momentum transfer in a horizontal multi-jet liquid-gas ejector", The Canadian Journal of Chemical Engineering, vol. 59, pp. 634-637, 1989.
  6. Y. P. Hong, D. H. Young, Y. M. Kim, and S. H. Youn, "A study on the performance characteristics of air driven gas ejector", Journal of the Korean Society of Marine Engineering, vol. 18, no.1, pp. 51-59, 1994 (in Korean).
  7. E. Rusly, Lu Aye, W. W. S. Charters, and A. Ooi, "CFD analysis of ejector in a combined ejector cooling system", International Journal of Refrigeration vol. 28, pp. 1092-1101, 2005. https://doi.org/10.1016/j.ijrefrig.2005.02.005
  8. ANSYS Inc., ANSYS CFX Documentation, Version 11, 2007.
  9. T. Esch, F. R. Menter, and W. Vieser, "Heat transfer predictions based on two-equation turbulence models", 6th ASME-JSME Thermal Engineering Joint Conference, 2003.
  10. F. R. Menter, "Two equations eddy-viscosity turbulence models for engineering applications", American Institute of Aeronautics and Astronautics Journal vol. 32, no. 8, pp. 1598-1605, 1994. https://doi.org/10.2514/3.12149

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  2. 회전 운동이 이젝터 성능에 미치는 영향에 관한 연구 vol.18, pp.4, 2017, https://doi.org/10.5762/kais.2017.18.4.544