Premixed flame impingement heat transfer with induced swirl |
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Authors: | DD Luo HS Zhen CW Leung CS Cheung |
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Affiliation: | 1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China;2. Alstom Power Ltd., Ashby-De-La-Zouch, UK;1. Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal 755025, Karnataka, India;2. Shri Guru Gobind Singji Institute of Engineering and Technology, Nanded 431606, Maharashtra, India;3. VDIT, Haliyal 581329, Karnataka, India;1. Department of Mechanical Engineering, FET, University of Botswana, Gaborone, Botswana;2. Department of Industrial Design & Technology, FET, University of Botswana, Gaborone, Botswana |
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Abstract: | Experiments were performed to study the heat transfer characteristics of a swirling premixed flame impinging vertically normal to a horizontal plate. The effects of Reynolds number (Re), equivalence ratio (Ф) and nozzle-to-plate distance (H) on the heat flux were examined. Comparisons were also made between the heat transfer behaviors of the swirling premixed flame (SPF) with a non-swirling premixed flame (PF) operating under the same conditions.Compared with the PF, the swirling flows in the SPF increase the entrainment of ambient air and induce a faster radial spreading rate of the flame jet. Therefore, the SPF provides a larger heating area and produces a more uniform radial heat flux distribution. For both the SPF and PF, the heat flux increases with Re due to the more complete combustion occurring at higher Re. For the SPF, the heat transfer increases with Ф, while it decreases with Ф for the PF because the stronger entrainment of ambient air in the SPF supports a more complete combustion. A smaller H is required for the maximum heat transfer to occur for the SPF. |
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