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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Characteristics of Combustion and Heat Transfer of Premixed Flat Flames with Heat Loss Stabilized in a Stagnation Flow
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Characteristics of Combustion and Heat Transfer of Premixed Flat Flames with Heat Loss Stabilized in a Stagnation Flow

机译：滞流下具有稳定热损失的预混扁平火焰的燃烧与传热特性

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The effects of the temperature of the stagnation surface (surface temperature), the Lewis number of the deficient reactant and preheating of the unburned gas on the characteristics of premixed flat flames with heat loss stabilized in the stagnation flow were numerically examined in order to utilize the heat from the flame effectively and to develop a new type of domestic burners and heaters. Then, the characteristics of convective heat transfer to the stagnation surface from the flame were discussed. (1) With an increase in the surface temperature T_w and in the preheat temperature of the unburned gas T_e, and with a decrease in the Lewis number Le, the flame temperature at the same value of the first Damkoehler number D_I is increased. (2) The heat flux utilized from the flame at the near limit of extinction is increased with an increase in T_e, and with a decrease in Le and T_w. (3) The characteristics of heat transfer to the stagnation surface in the case in which the premixed flat flame is stabilized in the stagnation flow are superior to those in the stagnation flow in which only the burned gas flows. (4) In order to increase the heat flux utilized from the premixed flat flame stabilized in stagnation flow, it is necessary to maintain higher flame temperature and to stabilize the flame near the stagnation surface. Therefore, preheating of the unburned gas and use of the premixed gas with Le < 1.0 are effectual in improving characteristics of heat transfer to the stagnation surface.
机译：数值研究了滞留表面温度（表面温度），反应物不足的路易斯数和未燃烧气体的预热对在滞流中稳定了热损失的预混平焰特性的影响，以便利用有效地从火焰中散发出热量，并开发出一种新型的家用燃烧器和加热器。然后，讨论了对流热从火焰传递到停滞表面的特性。 （1）随着表面温度T_w的增加和未燃烧气体T_e的预热温度的增加，以及路易斯数Le的减少，与第一达姆科勒数D_I相同的值的火焰温度增加。 （2）随着T_e的增加，以及随着Le和T_w的降低，在熄灭近极限处来自火焰的热通量增加。 （3）在滞流中使预混扁平火焰稳定的情况下，向滞留面的传热特性优于仅燃烧气体流动的滞流中的传热特性。 （4）为了增加在停滞流中稳定的预混扁平火焰利用的热通量，有必要保持较高的火焰温度并使停滞表面附近的火焰稳定。因此，未燃烧气体的预热和Le ＜1.0的预混合气体的使用在改善向停滞表面的热传递特性方面是有效的。

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