An experimental device of line fire under cross wind was built,and experimental simu-lation was conducted to study the hot gas temperature and radiant heat flux near the ground surface along the downstream direction.It is found that the gas temperature and the radiant heat flux decrease as the downstream distance increases.The horizontal length of the flame was suggested as the characteristic length for the dimensionless downstream distance and the dimensionless radiant heat flux.Data fitting shows that the gas temperature and the dimensionless radiant heat flux can well fit the dimensionless downstream distance.The radiative fraction,inversely calculated by the radiant heat fluxes at five measurement positions,shows a slight decrease as the cross-wind speed increases.Due to the coupled effect of wind momentum and flame buoyancy,the whole flame was divided into the momentum-and buoyancy-controlled regions with the flame drag length as the boundary,and then a revised model was developed to predict the thermal radiation from the line fire to the ground surface in the downstream direction.The model prediction agrees well with the experimental measurement.
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