锅支架高度对燃气灶性能的影响规律

Effect law of pan bracket height to gas stove performance

基于组分传输与反应模型,建立了大气式燃气灶燃烧过程数值模型,其中湍流采用Realizable k-ε模型,辐射采用DO模型,燃烧采用涡耗散模型。对不同工况下燃气灶燃烧过程进行三维数值模拟计算,研究了不同锅支架高度对燃气灶性能的影响规律。结果表明:随着锅支架高度增加,外圈火焰的内焰温度升高、长度变化不大,外圈火焰的外焰温度变化不大、长度增加;内圈火焰的内焰温度下降、长度变短,内圈火焰的外焰温度与长度变化无差异;CO质量分数呈线性下降趋势。内外圈火孔皆存在时,热效率随锅支架高度增加先下降后上升,而后持续下降,最佳锅支架高度为19mm,其热效率为62.43%,CO质量分数为2.652×10-4;只存在外圈火孔时,热效率随锅支架高度增加持续下降,最佳锅支架高度为15mm,其热效率为63.43%,CO质量分数为2.856×10-4。

A numerical model of burning process in domestic gas stoves was established according to the component transport and reaction model,using Realizable k-εturbulence model,DO radiation model and Eddy Dissipation combustion model.The burning processes of gas stoves under different operating conditions were simulated to investigate the effects of pan bracket height on the gas stove performance.When the height of pan bracket is increased,for the fire from the outer holes,the inner flame temperature and the outer flame length increase,while the outer flame temperature and the inner flame length change little;for the fire from the inner holes,the temperature and length of the inner flame decrease,while the temperature and length of the outer flame change little;CO concentrations show a linear decline.When both the inner and outer fire holes exist,the thermal efficiency firstly decreases,then increases,and finally decreases with the increasing of the pan bracket height.The optimum pan bracket height is 19 mm with the thermal efficiency of 62.43% and the CO concentration of 0.026 52%.When only the outer fire holes exist,the thermal efficiency decreases continuously with the increasing of pan bracket height,the optimum pan bracket height is 15 mm with the thermal efficiency of 63.43% and the CO concentration of 0.028 56%.