The gas water heater can only be ignited under a specific gas load,and the startup constant temperature time is long,so the user ex-perience is not very good.Based on Fluent software,detailed numerical simulation on flame tunnels combustion in a gas water heater was car-ried out by piecewise modeling method using Realizable k-ε turbulence model,Eddy-Dissipation Concept combustion model,DO radiation model and spark ignition model.It was found that there was large eddies inside the flame tunnel which leads to efficient mixture of gas and pri-mary air.However,there are obvious low temperature zones between flame tunnels,and the flame height is different.And the flame stability is poor,which affects the ignition success rate at arbitrary gas load.The structure optimization of the burner was further studied,and it was found that the stability time of the flame was reduced by 32%after using the both side ignition mode.With the installation of blunt bodies and side baffles,local backflow is generated in the combustor,which improves the combustion stability.The flame stability time is reduced by more than 16%compared with the original structure,and the flame height is more uniform.The research results provide reference for the tech-nical improvement of the burner of a gas water heater.
关键词
燃气热水器/火排燃烧特性/数值模拟/点火与传火/结构优化
Key words
gas water heater/combustion properties of flame tunnels/numerical simulation/ignition and transmission/structural optimization
维普
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