非对称泄爆条件下甲烷爆炸双向传播特性的研究
基金项目:
国家自然科学基金（No.51974107）；河南省双一流创建培育项目（AQ20230777）；河南理工大学创新型科研团队项目（T2021-4）
Study on the Bidirectional Propagation Characteristics of Methane Explosion under Asymmetric Venting Condition
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摘要:为探究非对称泄爆条件下甲烷爆炸双向传播特性，利用自主搭建的小型爆炸试验系统，对不同点火位置和左端泄爆口面积下甲烷爆炸双侧火焰传播速度和爆炸超压进行了试验研究。结果表明：非对称传播情况下，距离泄爆口较近的右侧火焰的传播速度更快；左端泄爆口面积的减小会进一步促进右侧火焰传播，同时抑制左侧火焰传播，当泄爆口面积小于或等于90 mm×90 mm时，左侧火焰出现逆流现象；随着左端泄爆口面积的减小，点火源两侧压力、压力差和最大压力上升速率均增大，从而导致爆炸指数增大，提高了爆炸危险性。
Abstract:In order to explore the bidirectional propagation characteristics of methane explosion in the context of asymmetric venting, a study was conducted using a customized small explosion test system. This study focused on analyzing the flame propagation velocity and explosion overpressure of methane explosion under varying ignition positions and in relation to the left venting area. The results show that the flame propagation speed on the right side near the vent is faster under the condition of asymmetric propagation; the reduction of the left vent area will further promote the flame spread on the right side and restrain the flame spread on the left side; when the left vent area is less than or equal to 90 mm × 90 mm, the flame on the left side appears countercurrent; with the decrease of the area of the left vent, the pressure, differential pressure and maximum pressure rise rate on both sides of the ignition source all increase, which leads to the increase of the explosion index and explosion risk.
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