弱约束条件下当量比对氢气爆燃特性的影响
基金项目:
国家自然科学基金面上项目（No.11972046；No.12272001）；安徽省自然科学基金优青项目（No.2108085Y02）。
Effect of Equivalent Ratio on the Deflagration Characteristics of Hydrogen in the Weak Constraint Condition
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摘要:为研究弱约束条件下氢气/空气预混气体的燃爆特性，以乳胶气球为反应容器开展了氢气爆炸实验，结合Chemkin模拟和改进的比色测温技术，研究了当量比对氢气/空气预混气体火焰传播形态、温度场分布、火焰速度及爆炸压力等特征参数的影响。实验结果表明：任一当量比下的OH自由基摩尔分数在达到最大值后会显著降低，这导致火焰传播时亮度先增强后减弱；随着火焰的传播，火球形成了中心温度低、边缘温度高的温度场分布结构；氢气/空气预混气体的爆炸火焰传播速度呈振荡分布；峰值超压和冲击波强度随当量比的增加呈先增大后减小的趋势，当量比为1.00时爆炸超压和冲击波强度达到最大值。
Abstract:To study the combustion and explosion characteristics of hydrogen/air premixed gas under weak constraint condition, hydrogen explosion experiments were carried out with latex balloons as the reaction vessels. The flame propagation pattern, temperature field distribution, flame velocity and explosion pressure with different equivalent ratios were studied by combining the Chemkin simulation and an improved two-colour pyrometer. The experimental results show that the OH radical mole fraction at any equivalent ratio decreases significantly after reaching the maximum value, which lead to the first enhancement and then attenuation of flame brightness during the flame propagation. With the propagation of flame, the fireball formes a temperature distribution structure with low temperature at the center and high temperature at the edge. The flame propagation velocity of hydrogen/air premixed gas is oscillating distributed. The peakpressure and shock wave strength first increase and then decrease with the increasing of equivalent ratio, and reach their maximum values as the equivalent ratio of 1.00.
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