矿井火灾巷道通风热阻力计算与实验研究

针对火灾时期矿井巷道通风热阻力计算问题，对风流温度-密度变化的通风巷道，推导出一种规范表达计算式。指出从广义的通风原理上，火灾时期的风流(热)阻力仍然包括摩擦阻力和局部阻力，同时还包括火燃烟气这一外来风源的附加阻力。新公式将通风阻力计算按巷道与流体“固-流双质”特性来表达，引入巷道几何风阻的概念，几何风阻是指巷道本身的阻力特性，与流体无关，它包括摩擦风阻和局部风阻两部分。从概念上，新公式对热阻力的本质有明确的辨析，在计算和分析上避免了容易出现的错误，由此推导出高温烟流通风阻力与火灾温度成正比。为了验证这一热流阻力效应，设计了一个实验管道装置，实验测定了热阻力随温度的变化，实验结果与理论推导结论相吻合。利用该实验装置还成功分离出了外源烟气流的附加阻力，实验结果表明，外源阻力完全是燃烧过程的物理映像，给出了有火灾外源气体参与热阻力贡献的实用算法。

Study of computation and experiment of ventilation heat resistance in roadway during mine fire

Aiming at the problem of the computation of ventilation heat resistance in a roadway during mine fire，to the ventilation roadways with airflow temperature and density variation，a normative computing formula was deduced.It was pointed out that according to generalized ventilation principle，the ventilation resistance during mine fire includes frictional resistance and local resistance，as well as an additional resistance caused by the external ventilation source，namely fire smoke.In the new formula，the computation of ventilation resistance is expressed from two media，namely fluid and roadway，and the conception of roadway geometry air resistance were introduced.Geometry air resistance is the resistance characteristic of roadway itself，and it has nothing to do with fluid.Geometry air resistance includes frictional resistance and local resistance too.Conceptually，the new formula has a clear discrimination to the essence of heat resistance，so the mistakes easily appear during computation and analysis will be avoided.The conclusion that the ventilation resistance of high temperature smoke flow is in direct proportion to fire temperature was drawn.To verify the heat flow resistance effect，an experimental pipeline facility was designed to determine the variation of heat resistance with temperature.The experimental results are identical to the conclusion drawn from theoretical derivation.The additional resistance of exogenous smoke flow was extracted successfully by using the experimental facility.Experimental results show that exogenous resistance is the physical image of combustion process.A practical method for computing the heat resistance with the participation of exogenous gas is provided.