辐射传热对微重力环境下预混火焰传播特性的影响  

EFFECTS OF RADIATIVE L0SSES ON PREMIXED FLAME PROPAGATION CHARACTERISTICS AT MICROGRWITY

作　　者：孔文俊[1] 韦明罡[1] 张孝谦[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100080

出　　处：《工程热物理学报》1998年第6期772-775,共4页Journal of Engineering Thermophysics

基　　金：国家921微重力燃烧资助

摘　　要：The effects of radiative losses on premixed laminar methane/air flame propagation char-acteristics were simulated in this paper with the detailed chemistry and transport propertiesby using the simplified radiative model which derived by assuming that the flames of interestare opticalIy thin and adopting the grey-medium approximation. Case studied include leanlaminar methane/air flame speed and flame standoff distance relative to the burner surface.The model predictions are compared with experimental data, and agreement is generallyvery good. The results have shown that radiative heat 1oss from the combustion productsare probably the dominant process leading to flame extinction at microgravity. It is importantat the fundamefltal flammability limits. Meanwhile, the flame standoff distance calculationsare also presented in this paper. To include the radiative heat loss, the fiame clearly standoff from the burner surface. This longer flame stand off imp1ies a weaker heat feedback fromthe fiame which is the same as the behavior of the candle flame at microgravity.The effects of radiative losses on premixed laminar methane/air flame propagation char-acteristics were simulated in this paper with the detailed chemistry and transport propertiesby using the simplified radiative model which derived by assuming that the flames of interestare opticalIy thin and adopting the grey-medium approximation. Case studied include leanlaminar methane/air flame speed and flame standoff distance relative to the burner surface.The model predictions are compared with experimental data, and agreement is generallyvery good. The results have shown that radiative heat 1oss from the combustion productsare probably the dominant process leading to flame extinction at microgravity. It is importantat the fundamefltal flammability limits. Meanwhile, the flame standoff distance calculationsare also presented in this paper. To include the radiative heat loss, the fiame clearly standoff from the burner surface. This longer flame stand off imp1ies a weaker heat feedback fromthe fiame which is the same as the behavior of the candle flame at microgravity.

关 键 词：热辐射 预混 层流 火焰结构 数值模拟 

分 类 号：O643.2[理学—物理化学]