Heat Transfer Enhancement of Impinging Jet from Pulse Jet Combustor

Abstract:

The aims of this study are to investigate flow characteristics in pulse jet combustor and heat transfer characteristics of impinging jet from pulse jet combustor. The combustor is Helmholtz type which has single combustor chamber and single tailpipe. The inner diameter (D) of tailpipe was 47 mm and tailpipe length was about 16D. The effect of number of air inlets: single inlet, double inlets with 90^o apart, double inlets with 180^o apart and triple inlets with 90^o apart on flow and heat transfer characteristics were studied. A water cooled heat flux sensor was applied to measure heat transfer rate on the surface at stagnation point. The jet-to-plate distance was varied at L=1D, 2D, 4D, 6D and 8D. Two of pressure transducers were mounted on the wall of combustion chamber and on the wall of tailpipe at 4D from tailpipe outlet to measure pressure simultaneously. It is found that the variation of pressure near the tailpipe outlet is strongly depended on air inlet configurations. The pressure variations in pulse jet combustor could be preliminary related to the temperature and velocity of jet from tailpipe and heat transfer rate on jet impingement surface.

• Periodical: Advanced Materials Research (Volumes 931-932)
• Pages: 1228-1232
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.931-932.1228
• Online since: May 2014
• Authors: Pathomporn Narato, Kittinan Maliwan, Chayut Nuntadusit*
• Keywords: Air Inlet Configurations, Flow Characteristic, Heat Transfer Characteristic, Impinging Jet, Pulse Jet Combustion

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