Journal of Mechanical Science and Technology

  • 제16권9호
  • /
  • Pages.1121-1136
  • /
  • 2002
  • /
  • 1738-494X(pISSN)
  • /
  • 1976-3824(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지

Effect of Convex Wall Curvature on Three-Dimensional Behavior of Film Cooling Jet

  • Lee, Sang-Woo (School of Mechanical Engineering, Kumoh National University of Technology) ;
  • Lee, Joon-Sik (School of Mechanical & Aerospace Engineering, Seoul National University) ;
  • Keon Kuk (School of Mechanical & Aerospace Engineering, Seoul National University)
  • 발행 : 2002.09.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

The flow characteristics of film coolant issuing into turbulent boundary layer developing on a convex surface have been investigated by means of flow visualization and three-dimensional velocity measurement. The Schlieren optical system with a spark light source was adopted to visualize the jet trajectory injected at 35° and 90° inclination angles. A five-hole directional pressure probe was used to measure three-dimensional mean velocity components at the injection angle of 35°. Flow visualization shows that at the 90° injection, the jet flow is greatly changed near the jet exit due to strong interaction with the crossflow. On the other hand, the balance between radial pressure gradient and centrifugal force plays an important role to govern the jet flow at the 35° injection. The velocity measurement shows that at a velocity ratio of 0.5, the curvature stabilizes downstream flow, which results in weakening of the bound vortex structure. However, the injectant flow is separated from the convex wall gradually, and the bound vortex maintains its structure far downstream at a velocity ratio of 1.98 with two pairs of counter rotating vortices.

키워드

참고문헌

  1. Andreopoulos, J., 1985, 'On the Structure of Jets in a Crossflow,' J. Fluid Mechanics, Vol. 157, pp. 163-197 https://doi.org/10.1017/S0022112085002348
  2. Anerepoulos, J. and Rodi, W., 1984, 'Experimental Investigation of Jets in a Crossflow,' J. Fluid Mechanics, Vol. 138, pp. 93-127 https://doi.org/10.1017/S0022112084000057
  3. Kamotani, Y. and Greber, I., 1972, 'Experiment on a Turbulent Jet in a Cross Flow.' AIAA J., Vol. 10, pp. 1425-1429 https://doi.org/10.2514/3.50386
  4. Keffer, J. F. and Baines, W. D., 1963, 'The Round Turbulent Jet in a Cross-wind,' J. Fluid Mechanics, Vol. 15, pp. 481-496 https://doi.org/10.1017/S0022112063000409
  5. Ko, S. Y., Xu, J. Z., Yao, Y. O. and Tsou, F. K., 1984, 'Film Cooling Effectiveness and Turbulence Distribution of Discrete Holes on a Convex Surface,' Int. J. Heat Mass Transfer, Vol. 27, pp. 1551-1557 https://doi.org/10.1016/0017-9310(84)90267-9
  6. Lee, S. W., Lee, J. S. and Ro, S. T., 1994, 'Experiment Study on the Flow Characteristics of Streamwise Inclined Jets in Crossflow on Flat Plate,' ASME J. Turbomachinery, Vol. 116, pp. 97-105 https://doi.org/10.1115/1.2928283
  7. Meroney, R. N. and Bradshaw, P., 1975, 'Turbulent Boundary-Layer Growth over a Longitudinally Curved Surface,' AIAA J., Vol. 13, pp. 1448-1453 https://doi.org/10.2514/3.7014
  8. Morton, B. R., 1961, 'On a Momentum-mass Flux Diagram for Turbulent Jets, Plumes and Wakes,' J. Fluid Mechanics, Vol. 10, pp. 101-108 https://doi.org/10.1017/S0022112061000093
  9. Moussa, Z. M., Trischka, J. W. and Exkinazi, S., 1977, 'The Near-Field in the Mixing of a Round Jet with a Cross-stream,' J. Fluid Mechanics, Vol. 80, pp. 49-80 https://doi.org/10.1017/S0022112077001530