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生产矿井都有多个自然风压存在,其中任何一个自然风压都不能表示全矿井的自然风压,而必须采用一个综合数值——矿井综合自然风压表示之。生产矿井的自然风压多用测定方法求得,对于只有一个自然风压的矿井,自然风压的测定方法有:①直接测定法,②停、开主扇测算法,③增设局部阻力测算法,④调节主扇压力测算法〔1〕〔2〕〔3〕,后三种方法称为间接测定法。间接测定法需要改变矿井的总风景,测定改变风量前后的有关数据,再用包括自然风压 H_(?)和矿井总风阻 Rm 两个未知数的联立方程求解得到矿井自然风压。例如,抽出式通风增阻测算法
There are several natural wind pressure in production mines. No natural wind pressure can represent the natural wind pressure of the whole mine. Instead, a comprehensive numerical value must be used - that is, natural gas pressure in mines. The natural wind pressure of the production mine is determined by the multi-purpose determination method. For the natural gas pressure pressure mine, the natural wind pressure measurement methods are as follows: ① direct measurement method, ② stop and open main fan measurement method, ③ additional local resistance measurement method, ④ adjust the main fan pressure measurement 〔1〕 〔2〕 〔3〕, the latter three methods called indirect determination. The indirect measurement method needs to change the general landscape of the mine, measure the data before and after the change of the air volume, and then obtain the natural wind pressure of the mine by solving simultaneous equations including the natural wind pressure H_ (?) And the total wind resistance Rm of the mine. For example, pull-out ventilation resistance measurement method