中文摘要：

本文通过理论分析和数值模拟系统地研究了辐射热损失对球形火焰传播速度的影响。研究结果表明辐射热损失的影响分为直接影响和间接影响;直接影响指辐射热损失会降低火焰温度,从而降低火焰传播速度;间接影响指辐射热损失导致的冷却会引起逆向火焰传播的流动,从而降低火焰传播速度。对近可燃极限预混气体,直接影响起主导作用;对高辐射强度预混气体,间接影响起主导作用。本文研究的结果对球形火焰法测量火焰传播速度有着重要的指导意义。

英文摘要：

The effects of radiative heat loss on the propagating speed of spherical flames are systematically studied by theoretical analysis and numerical simulation.It is found that there are two different effects of radiative heat loss：（1） the direct effect by which the flame temperature and thus the flame propagating speed are reduced due to the radiative heat loss;and（2） the indirect effect by which the flame propagating speed is reduced by the incoming flow toward the flame front which is caused by the radiation cooling.For mixtures near their flammability limits,the direct effect dominates;while for mixtures with high radiative intensity,the indirect effect dominates.The results presented in this study are important for experiments in which the laminar flame speed is measured by outwardly propagating spherical flames.