회전하는 사각덕트 유로에서 벽면 유출홀에 따른 열전달 특성변화(Ⅰ) - 회전수 변화에 따른 영향 -

다국어 초록 (Multilingual Abstract)

The present study has been conducted to investigate convective heat/mass transfer in the cooling passage with bleed holes. The rotating square channel has 40.0 ㎜ hydraulic diameter and the bleed holes on the leading surface of the channel. The hole diameter of bleed hole is 4.5㎜ and its spacing is (p/d=4.9) about five times of hole diameter. Exit mass flow rate through bleed holes is 10% of the main mass flow rate and rotation number is changed form 0.0 to 0.4. A naphthalene sublimation technique is employed to determine the detailed local heat transfer coefficients using the heat and mass transfer analogy. The cooling performance is influenced by exit mass flow rate through bleed holes and Coriolis force of rotating channel for fixed Reynolds number. The heat transfer on the leading surface is decreased due to Coriolis force. However the total heat transfer is enhanced around holes on the leading surface because of trapping flow by bleeding.

목차 (Table of Contents)

• ABSTRACT
  
• 1. 서론
  
• 2. 실험장치 및 방법
  
• 3. 실험결과 및 고찰
  
• 4. 결론
  
• 참고문헌

참고문헌 (Reference)

1 "review of mass transfer measurement using naphthalene sublimation" 10 : 416-434, 1995

2 "Numerical prediction of heat transfer in a channel with ribs and bleed" 1997

3 "Internal cooling passage heat transfer near the entrance to a film cooling hole" asme paper (asme paper): 1992

4 "Heat/Mass transfer in rotating cooling passage of turbine blade" 46-54, 2000

5 "Heat transfer enhancement within a combinations of ribs with film cooling holes" 118 : 428-434, 1996

6 "Heat and mass transfer characteristics on rotating square duct with bleed holes" 1104-1109, 2004

7 "Experimental study of the effects of bleed holes on heat transfer and pressure drop in trapezoidal passges with tapered turbulators" 117 : 281-289, 1995

8 "Experimental heat transfer and bulk air temperature measurements for a multipass internal cooling model with ribs and bleed" 2000

9 "Effects of rib arrangements and rotating speed on heat transfer in a two- pass duct" 2003

10 "Detailed heat transfer distributions in two- pass smooth and turbulated square channels with bleed holes" 8 : 133-140, 1996

11 "Describing uncertainty in single-sample experiments" 75 : 3-8, 1953

12 "Computation of flow and heat transfer in a rectangular channel with ribs" 1995