SET Proceedings 2978-4387 Caravel Press 10.65582/set.2008.273 2008.273 Study on the performance characteristics of the ejector along the driving nozzle exit position JiMyoungKuk mkji73@hotmail.com UtomoTony msktonysu@yahoo.co.id ParkGiTae JeongHyoMin hmjeong@gnu.ac.kr ChungHanShik hschung@gnu.ac.kr Gradduate school of department of Mechanical and Precision Engineering, Gyeongsang National University, Tongyoung, Korea Department of Mechanical and Precision Engineering, Gyeongsang National University · Institute of Marine Science, Tongyoung, Korea 24082008 7 1 978-1-995850-08-5 1951 1956 24 August 2008 © 2008 Copyright WSSET 2008

Most industrial processes use a significant amount of thermal energy, mostly by burning fossil fuels. Some part of the energy released in combustion is inevitably rejected to the surroundings as waste. This waste heat can be utilized in certain types of refrigeration system such a jet refrigeration cycle. The influence of the ejector system depends on a mixing by the shearing action between the primary flow and the secondary flow, the pressure loss by the shock wave at the ejector throat, the pressure recovery of a diffuser and etc. And the shape of the component elements for comprising influence is the important design parameters. Thus, in this study the condition that it can maintain the optimum operation state of the ejector system according to a change including the aspect ratio of the exit position of the driving nozzle and the length of the ejector throat length.

 diffuser ejector driving nozzle supersonic flow ejector throat 24 to 27 August 2008 7th International Conference on Sustainable Energy Technologies SET2008 7 Seoul, Korea Alperin, M., Wu, J.-J., 1983a. Thrust augmenting ejector, Part I. AIAA J. 21 (10), 1428–1436. J.H. Keenan, E.P. Neumann, A simple air ejector, ASME Journal of Applied Mechanics 64 (1942) 75–81. K. Chunnanond, S. Aphornratana, Ejectors: applications in refrigeration technology, Renewable and Sustainable Energy Reviews 8 (2004) 129–155. Da Wen Sun, Ian W. Eames and Satha Aphornratana, 1996, "Evaluation of a novel combined ejector-absorption refrigeration cycle - I: computer simulation", Int J. Refrig., Vol. 19, No. 3, pp. 172-180. Keenan, J. H., Neumann, E. P. and Lustwerk, F., 1950, "An Investigation of Ejector Design by Analysis and Experiment", Journal of Applied Mechanics, Vol. 17, No. 3, pp. 299-309. G. K. Alexis, 2004, "Estimation of ejector's main cross sections in steam-ejector refrigeration system", Applied Thermal Engineering, Vol. 24, pp. 2657-2663. German R. C., Bauer R. C. and Panesci J. H., 1966, "Methods for determining the performance of ejector-diffuser system", Journal of Spacecraft, Vol. 3, pp. 193-200. Matsuo K., Sasaguchi K., Tasaki K. and Mochizuki H., 1981, "Investigation of supersonic air ejectors-Part 1, Performance in the case of zero-secondary flow", Bull JSME Series B, Vol. 24, No. 198, pp. 2090-2097. FLUENT 6.3 User’s guide, FLUENT INC. Lebanon, NH, USA.