In order to enable students to master the relevant knowledge and rules of the influence of gas and wind pressure on the drift and branch airflow disturbance in the mine tunnel,an experimental device for the airflow disaster induced by gas and wind pressure for the undergraduate teaching is developed.A series of experiments about the airflow catastrophes induced by gas and wind pressure are designed,which vividly demonstrates the mechanism of such catastrophes, and trains students ' practical ability and scientific research ability.Before each experiment,the mixed gas of N2 and H e with volume ratio of 1 :1 is first filled into the middle branch to simulate the gas accumulation in the middle branch.Then,the experiments on the change of the wind direction,adjustment of the inclination angle of the mine tunnel and area of the mine tunnel,wind resistance between the middle branch and the left side branch and wind pressure of the fan are carried out respectively.The experiments show that the airflow catastrophes induced by gas and wind pressure is not only related to the wind resistance of main branches and side branches and the wind pressure of the main fan,but also closely related to the factors such as the length,height difference,etc., of the mine tunnel.%为了让学生掌握瓦斯风压对井巷分支风流紊乱影响的相关知识及规律,研制了瓦斯风压诱导风流灾变本科教学实验装置,设计了一系列瓦斯风压诱致井巷风流灾变实验,形象地展示瓦斯风压诱致井巷风流灾变机理,同时培养学生的动手能力和科研能力.每组实验前,先对中间分支充入N2与He体积比为1:1的混合气体,模拟中间分支瓦斯积聚;然后改变通风方向、调节巷道倾斜角度、巷道断面积、中间分支与左侧分支的风阻以及风机风压分别进行实验.实验表明,瓦斯风压诱导风流灾变不仅与主干分支、旁侧分支的风阻、主要通风机的风压相关,还与巷道的长度、高差等因素密切相关.
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