Browse > Article
http://dx.doi.org/10.5139/JKSAS.2007.35.8.706

A Study on Jet Characteristic using a Coanda Effect in a Constant Expansion Rate Nozzle  

Lee, Dong-Won (경북대학교 대학원 기계공학과)
Lee, Sak (두산 인프라 코어)
Kim, Byung-Ji (가톨릭상지대학 자동차.모터스포츠과)
Kwon, Soon-Bum (경북대학교 기계공학부)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.35, no.8, 2007 , pp. 706-713 More about this Journal
Abstract
The jet structure issuing from a conventional convergent nozzle of variable expansion rate is compared with the result from the nozzle of a constant expansion rate using a normal type annular slit. In experiments, to investigate the jet characteristics between the two cases of jet, the mean velocity of nozzle exit is fixed to be 90m/s, the pressures along the jet axis and radial directions are measured by a scanning valve system moving with 3-axis auto-traverse unit, and the velocity distribution obtained by calculation from the measured static and total pressures is compared. Also to obtain the highly stable and convergence jets, it is turned out that the flow through a nozzle of constant expansion rate using the Coanda effect with an annular slit is the most preferable than that case through variable expansion rate nozzle. Furthermore, it is found that the pressure drop along the nozzle for the constant expansion rate nozzle is small relatively against to the case of variable expansion rate nozzle.
Keywords
Coanda Effect; Constant Expansion Rate; Conver-gent Nozzle; Annular Slit; Subsonic Flow;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Park, J. J. and Lee, S. H., 'A Numerical Study on a Circulation Control Foil using Coanda Effect', SNAK J., Vol. 37, No.2, 2000, pp. 70-76
2 Matsuo, S., Lee, K H, ada, S., Setoguchi, T. and Kim, H D., 'Effect of Annular Slit Geometry on Characteristics of Spiral Jet', J. of Thermal Science, Vol. 12, No.3, 2003, pp. 225-230   DOI
3 Kamei, O. and Setoguchi, T., A Study on the Spiral Flow by a Coanda Nozzle, Master's Thesis, Saga University, Japan, 2005
4 Moore, M. J. and Sieverding, C. H., Two-Phase Steam Flow Separators, Hemisphere London, 1976, pp. 134-135
5 Munson, B. R, Young, D. F. and Okishi, T. H., Fundamentals of Fluid Mechanics, 4th Edition, Wiley, New-York, 2002, pp. 120-121
6 Horii, K., Ohsumi, K., Matsma,e Y., Cheng, X. M., Taei, M. Yasukawa, E. and Hashimoto, B., 'A Coanda Spiral Device Passing Optical Cords with Mechanical Connectors Attached Through a Pipeline', ASME Gas-Solid Flow, FED-Vol. 121, 1991, pp. 65-70
7 Horii, K., Matsumae, Y., Cheng, X. M., Takei, M., Yasukawa, E. and Hashimoto, B., 'Focusing Pheno-menon and Stability of Spiral-Flow Jet', Trans. Jpn. Soc. Aeronautical and Space Science, Vol. 33, No. 102, 1991, pp. 141-153
8 Chang, P. K. Control of Flow Separation, Mcgraw-Hill, 1976, pp. 363-364