Numerical simulation analysis on smoke spread of fire in deep vertical space with different aspect ratios
To study the influence of aspect ratio on smoke spread of fire in the deep vertical spaces,seven physical models of deep vertical space with different aspect ratios were established based on the prototype of a deep vertical garage.The smoke spread characteristics of fire in the deep vertical space with different aspect ratios were analyzed,and the variation laws of smoke velocity field and temperature in the deep vertical space were mastered.The results show that with the decrease of as-pect ratio,the average velocity of smoke spreading to the exit presents a decreasing trend,and the time of smoke filling deep vertical space is shortened gradually.The overall velocity field is relatively regular before 120 seconds,and the vertical veloci-ty of smoke presents a decreasing trend as the aspect ratio of deep vertical space decreases.There is a critical aspect ratio,which means that when the fire source is located at the bottom of deep vertical space,only hot smoke flows out at the exit,and the simulated critical aspect ratio is between 0.3 and 0.36.Under the same simulated critical,the temperature on the center line of deep vertical space decreases gradually with the increase of the height above the fire source.The temperature at the same height along the center line of deep vertical space increases with the decrease of aspect ratio of deep vertical space.The research results can provide scientific reference for fire protection design of deep vertical space.
deep vertical space fireaspect ratiosmoke spreadvelocity fieldnumerical simulation
NETL
NSTL
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