受限空间内乙炔/空气预混气体燃爆特性研究
基金项目:
国家自然科学基金面上项目（11972046）；安徽省自然科学基金优青项目（2108085Y02）；安徽省高校自然科学基金重大项目（KJ2020ZD30）；安徽理工大学研究生创新基金（2021CX2026）
Explosion Characteristics of Acetylene/Air Mixtures in Confined Space
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摘要:采用自制的方形爆炸设备，研究了受限乙炔-空气预混气体的火焰传播行为和爆炸超压等特征参数，并分析气体浓度和点火位置对乙炔火焰传播行为的影响。研究结果表明：乙炔/空气混合物的爆炸峰值超压和峰值压力上升速率随浓度的升高均先增大后减小，在14%乙炔浓度取得最大值，分别为1.7MPa和80.64MPa·s-1，密闭空间内乙炔爆炸正相冲量与浓度近似呈二次函数关系；在实验浓度范围内，乙炔/空气爆燃火焰传播速度在10%时最快，最大火焰传播速度可达11.77m·s-1；初始点火位置对乙炔的峰值超压和正相冲量的影响不明显，但对最大压力上升速率的影响较大。
Abstract:The characteristic parameters such as flame propagation behavior and explosion overpressure of confined acetylene-air premixed gas were studied by self-made square explosion equipment, and the effects of gas concentration and ignition position on the flame propagation behavior of acetylene were analyzed in detail. The results show that the peak overpressure and peak pressure rise rate of acetylene/air mixture first increase and then decrease with the increase of concentration of acetylene, the maximum values are 1.7MPa and 80.64MPa·s-1 at 14% concentration, respectively. The positive phase impulse of acetylene explosion in a confined space is approximately quadratically related to the concentration. Within the experimental concentration range, the propagation velocity of acetylene/air deflagration flame is the fastest at 10% concentration, and the average flame propagation velocity reaches the maximum of 11.77m·s-1. The ignition position has little influence on peak overpressure and positive impulse of acetylene, while has a great influence on peak pressure rise rate.
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