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在装有对开式泄爆板的透明爆燃腔体内,用试验方法研究了甲烷/空气预混气体爆燃过程中的爆燃压力、火焰传播速度及泄爆板转动规律。结果表明:在对开式泄爆条件下,与无障碍物的工况相比,随障碍物数量增多或当量比从0.7增大到1.0,火焰传播速度、爆燃过程中的最大压力和泄爆板开启速度越来越大;当量比越接近1.0,泄爆过程中压力峰值产生的时间越提前;由于对开式泄爆板的瞬态泄压作用,压力曲线波峰附近出现“凹陷”现象。此外,在对开式泄爆容器的设计过程中,应尽可能减少容器中障碍物的数量,以降低爆燃过程中的压力峰值。
In a transparent detonation chamber with an open vent plate, the deflagration pressure, the flame propagation velocity and the law of rotation of the vent plate were studied by the experimental method in the detonation process of methane / air premixed gas. The results show that under the condition of split venting, compared with the condition without obstacle, as the number of obstacles increases or the equivalent ratio increases from 0.7 to 1.0, the propagation velocity of flame, the maximum pressure during deflagration and the venting Plate opening speed is more and more big; when the ratio is closer to 1.0, the pressure peak value during the venting process comes earlier; due to the transient pressure relief effect on the open vent plate, the “depression” phenomenon. In addition, in the design of split vent containers, the number of obstructions in the container should be reduced as much as possible to reduce the peak pressure during deflagration.