Browse > Article
http://dx.doi.org/10.5916/jkosme.2008.32.8.1231

The Flow Characteristics with Variation of Nozzle-to-nozzle Angles on Unventilated Dual Jests  

Kim, Dong-Keon (부산대학교 기계기술연구원)
Kim, Moon-Kyoung (창원전문대학 기계설계과)
Yoon, Soon-Hyun (부산대학교 기계공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.32, no.8, 2008 , pp. 1231-1239 More about this Journal
Abstract
The characteristics of flow on unventilated dual jets was experimentally investigated. The two nozzles each with an aspect ratio of 20 were separated by 6 nozzle widths. Reynolds number based on nozzle width was set to 5,000 by nozzle exit velocity. All measurements were made over a range of nozzle-to-nozzle angles from $0^{\circ}$ to $25^{\circ}$. The particle image velocimetry and pressure transducer were employed to measure turbulent velocity components and mean static pressure, respectively. It was shown that a recirculation zone with sub-atmospheric static pressure was bounded by the inner shear layers of the individual jets and the nozzles plated. As nozzle-to-nozzle inclined angles were decreased, it was found that the spanwise turbulent intensity is greater than the streamwise turbulent intensity in the merging region. In the combined region, the velocity of dual jets agree well with that of single jet, but the turbulence intensity of dual jets not agree with that of single jet.
Keywords
Unventilated dual jets; Merging point; Combined point; Particle image velocimetry; Turbulence intensity;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Tanaka, E., "The interference of two-dimensional parallel jets (1st report, Experiments on dual jet)," Bull. JSME, Vol. 13, pp. 272-280, 1970   DOI
2 Tanaka, E., "The interference of two-dimensional parallel jets (2nd Report, Experiments on the combined flow of dual jets)," Bull. JSME, Vol. 17, pp. 920-927, 1974   DOI
3 Murai, K., Taga, M. and Akagawa, K., "An experimental study on confluence of tow-dimensional jets," Bull JSME, Vol. 19, pp. 956-964, 1976
4 Gortler, H., "Berechnung von Aufgaben der freien turbulenz auf grund eins neuen Naherungsansatzes," Z. Angew, Math Mech. Vol. 22, pp. 244-1942   DOI
5 Morel, T., "Comprehensive design of axisymmetic wind tunnel contraction," ASME Journal of Fluid engineering, Vol. 97, pp. 225-233, 1975   DOI
6 Anderson, E. A. and Spall, R. E., "Experimental and Numerical investigation of Two Dimensional Parallel Jets," Journal of Fluids Engineering, Vol. 123, pp. 401-406, 2001   DOI
7 Gutmark, E. and Wyananske, J., "The Planar Turbulent Jet," J. of Fluid Mech., Vol. 73, pp. 465-495, 1976   DOI   ScienceOn
8 Harpham, A. S. and Shambaugh, R. L., "Velocity and Temperature Field of Dual Rectangular Jets," Ind. Eng. Cham. Res. Vol. 36, pp. 3937-3943, 1997   DOI   ScienceOn
9 Wang, C. S., Lin, Y. F. and Sheu, M. J., "Measurement of turbulent inclined plane dual jets," Experiments in Fluids, Vol. 16, pp. 27-35, 1993   DOI