Abstract
Vortex within film cooling hole has impacts on flow field downstream of the jet, but investigations on the relationship between two vortices which inside and outside of film hole are not very much. In this paper, numerical method is used to study the formation of vertex within film cooling hole and its influence on film cooling efficiency. Results show that when jet get into the film hole with a large deflection, a pair of vortex will generate within the film hole. This pair of vortex will cause energy loss and has an obvious impact on kidney vortex in the main flow. When the rotation of vortex within film hole is the same as kidney vortex in mainstream, intensity of the kidney vortex will increase and film cooling effectiveness will decrease. On the contrary, when the rotation of vortex is contrary with kidney vortex in the main flow, intensity of the kidney vortex will decrease and film cooling effectiveness will increase. Because of the optimization of vortex within film hole, film cooling effectiveness of two new kinds of configurations proposed in this paper is improved.
| Original language | English |
|---|---|
| Pages (from-to) | 2904-2911 |
| Number of pages | 8 |
| Journal | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics |
| Volume | 40 |
| Issue number | 12 |
| State | Published - 1 Dec 2019 |
Keywords
- Film cooling
- Numerical simulation
- Turbine blade
- Vortex within film hole