Numerical investigation of heat transfer in film layer under supersonic condition of convergent-divergent transition
| Autor: | Honghu Ji, Ji-Quan Li, Quan Hong, Bo Zhang, Yun Bai |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Overall pressure ratio
Shock wave Leading edge Materials science shock wave Renewable Energy Sustainability and the Environment 020209 energy Astrophysics::High Energy Astrophysical Phenomena lcsh:Mechanical engineering and machinery film cooling convergent-divergent nozzle 02 engineering and technology Mechanics supersonic flow Adverse pressure gradient Heat transfer heat transfer 0202 electrical engineering electronic engineering information engineering Oblique shock Supersonic speed lcsh:TJ1-1570 Choked flow |
| Zdroj: | Thermal Science, Vol 24, Iss 3 Part B, Pp 2279-2288 (2020) |
| ISSN: | 0354-9836 |
| Popis: | The distribution of film cooling effectiveness in supersonic mainstream of circle-rectangular Convergent-Divergent transition has been numerically investigated under different pressure ratios. The shock wave exerted superior influence on film cooling. In supersonic main flow, extra compression waves formed in upstream of the film holes, resulted by the obstruction of the multiple cooling jets. This exerted extra pressure to the boundary-layer, induced adverse pressure gradient, and led to weakening of the film flow attachment ability and decreasing of local cooling effectiveness. Bow oblique shock wave occurred in front of holes, the two oblique bow shaped low pressure zones formed on both sides of the hole, and low cooling effectiveness zones appeared accordingly. The inefficient region at the leading edge of the hole destroyed the film developing between holes, decreased the cooling effectiveness accumulation in the rear part. The decrease of hole incline angle caused an increase of cooling effectiveness, which reduced reverse velocity gradient caused by shock wave in the boundary-layer and improved film attachment. The influence of main flow pressure ratio to film cooling was also investigated, and found with increasing of the ratio, the influence will became even significant. |
| Databáze: | OpenAIRE |
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