Abstract
The unsteady flowfield of the turbine blade film cooling was investigated numerically under different width of the unsteady wake, and the influence of the unsteady wake width on the blade film cooling effectiveness was discussed. Results show that the zone with low velocity forming by the unsteady wake decreases the depression of the cooling ejection, and much more coolant flow enters and mixes with the main flow, resulting in the reduction of film cooling effectiveness. The level of the reduction of film cooling effectiveness is higher with the increase of the unsteady wake width. The influence of the unsteady wake on the cooling effectiveness is larger on the pressure surface than that on the suction surface. The magnitude of the cooling effectiveness after the first cooling hole on the pressure surface can decrease about 15 percent of the original value, and the change of the cooling effectiveness is not obvious on the suction surface.
| Original language | English |
|---|---|
| Pages (from-to) | 97-102 |
| Number of pages | 6 |
| Journal | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering |
| Volume | 31 |
| Issue number | 29 |
| State | Published - 15 Oct 2011 |
Keywords
- Blade surface
- Film cooling effectiveness
- Turbine blade film cooling
- Unsteady
- Wake width