应用因次分析法推导出表征巷（隧）道火灾烟流滚退距离变化规律的通用无因次表达式，该表达式包含影响滚退距离的火源热释放速率、通风风速、巷道倾角和形状等因素。
A non-dimensional expression, which shows the general variation of the backflow distance of smoke and hot gases during a roadway or tunnel fire, was derived through dimensional analysis.
结果表明，弗鲁德数、无因次装料高度及通气速率对混合特性有明显的影响。
The results show that the effects of the Froude number, the dimensionless height of the particle bed and the inlet gas flow rate on mixing characteristics of the stirred bed reactor are significant.
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