Influence of Mach Number of Main Flow on Film Cooling Characteristics under Supersonic Condition
| Autor: | Ji-Quan Li, Yuanxiang Chen, Wang Zhiguo, Ji Honghu, Bo Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Shock wave
Materials science shock wave Physics and Astronomy (miscellaneous) 020209 energy General Mathematics Astrophysics::High Energy Astrophysical Phenomena supersonic congestion Flow (psychology) Mixing (process engineering) film cooling 02 engineering and technology 01 natural sciences Physics::Fluid Dynamics symbols.namesake Condensed Matter::Materials Science Condensed Matter::Superconductivity 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Computer Science (miscellaneous) mixing Supersonic speed 010306 general physics Jet (fluid) lcsh:Mathematics supersonic main flow Aerodynamics Mechanics lcsh:QA1-939 stratified layer Mach number Chemistry (miscellaneous) Heat transfer symbols |
| Zdroj: | Symmetry, Vol 13, Iss 127, p 127 (2021) Symmetry Volume 13 Issue 1 |
| ISSN: | 2073-8994 |
| Popis: | The flow and heat transfer characteristics of a film jet inclined to different supersonic situations with a varying Mach number of the main flow were numerically investigated. In supersonic situations, complicated waves are generated by the obstacle of the film jet. In this work, extra pressure is exerted onto the film jet, causing better film attachment to the wall. The strengthening of attachment decreases mixing between the main flow and film jet, causing better film cooling. We observed multi-interfacial layered structures caused by the film jet under the complicated effect of shock waves. At the interfaces of the film jet and shock waves, additional pressure is exerted on the film towards the wall. The pressure increases as the Mach number of the main flow increases and contributes to the increased adhesion of the gas film, which causes the cooling enhancement under a supersonic condition. In the vicinity of the film hole exit, a local low pressure region is formed under the influence of the supersonic main flow. An aerodynamic convergent&ndash divergent state was formed in the film hole, devastating the state of supersonic congestion of the film hole and further enhancing the film cooling effect. |
| Databáze: | OpenAIRE |
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