矿井井筒提升容器活塞风效应分析及计算

矿井提升容器在井筒中占据了部分井筒空间,升降运动时,产生活塞作用效应,提升容器周围的流场和压力场均发生变化,产生动态局部阻力.根据流体力学理论,分析了罐笼在井筒内升降过程中空气的速度变化情况,采用相对坐标法推导了在井筒风速影响下罐笼顺风、逆风和相会时的活塞风速数学计算模型.研究结果表明,井筒提升容器活塞效应的影响因素主要有提升容器的外形尺寸、井筒内的机械通风风速和阻塞比等.研究结论为研究由于矿井井筒提升容器活塞作用效应产生动态局部阻力提供了理论依据.图2,参11.

Analysis and Calculation of the Effect of Piston-Wind by Hoisting Conveyance in Vertical Shaft

While in the progress of up-and-down movement, the hoisting conveyance which occupied part space of vertical shaft caused piston-effect, lead to the change of the flow filed and pressure field around the hoists, and generated frequently local resistance. According to the fluid mechanics, the change of velocity of airflow was analyzed, which in the progress of movement of cage, the formula was deduced for calculating the piston-wind by using relative coordinate method. The results indicated that there are many factors which impact the piston-effect, such as the physical dimension of the cage, velocity of mechanical ventilation in vertical shaft and blockage ratio. The results offer a basis for studying the dynamic local resistance .