Heat transfer characteristics of an impinging swirling inverse diffusion butane/air flame jet
| Autor: | Chun Shun Cheung, L.L. Dong, Chun Wah Leung |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Fluid Flow and Transfer Processes
Jet (fluid) Materials science Mechanical Engineering General Chemical Engineering Heat transfer enhancement Enhanced heat transfer Flame structure Diffusion flame Aerospace Engineering 02 engineering and technology Mechanics Combustion 01 natural sciences 010305 fluids & plasmas Adiabatic flame temperature 020401 chemical engineering Nuclear Energy and Engineering 0103 physical sciences Heat transfer 0204 chemical engineering |
| Zdroj: | Experimental Thermal and Fluid Science. 128:110438 |
| ISSN: | 0894-1777 |
| Popis: | This paper presents an experimental study to explore the feasibility of utilizing a swirling inverse diffusion flame (IDF) jet for impingement heating. The investigation concentrates on the impinging flame structure and impingement heat transfer. The effects of air swirling, the air jet Reynolds number, Rea, the global equivalence ratio, Φ, and the non-dimensional burner-to-plate distance, H/da, on the impinging flame shape and impingement heat transfer are investigated experimentally. The Experiments show that introduction of air swirling can either enhance or reduce the heat transfer rate depending on operating condition. Under-swirling produces no evident heat transfer enhancement due to insufficient air/fuel mixing, while over-swirling reduces heat transfer rate because of the dilution of the entrained cold ambient air. Heat transfer enhancement is achieved with the appropriate level of air swirling when the complete combustion occurs in the inner reaction zone around a stoichiometric condition. The investigation shows that the impinging inverse flame jet with an appropriate level of air swirling possesses the advantages of both premixed and diffusion flame jets with blue appearance, ultra-low NOx emission, high flame temperature, good self-stabilization capability, and enhanced heat transfer rate. Therefore, it is a desirable option for impingement heating applications. |
| Databáze: | OpenAIRE |
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