【摘要】 为研究浓度梯度的变化对甲烷-空气预混气燃爆特性的影响。在方形爆炸实验管道中布置压力、温度传感器,开展不同甲烷浓度梯度下甲烷-空气预混气体爆炸试验。研究结果表明:浓度梯度的增大使管道内甲烷-空气预混气的火焰平均速度和最大爆炸压力均呈现先升高后降低的趋势,当浓度梯度为1.0%时二者均达到最大值;爆炸压力上升速率亦随浓度梯度增大先升高后降低,浓度梯度为1.5%时最大;达到最大爆炸压力的时间随浓度梯度的增加呈现往复变化趋势;甲烷-空气混合气的爆炸温度随浓度梯度的上升呈现先上升后下降的趋势。更多还原

【Abstract】 In order to study the influence of concentration gradient on combustion and explosion characteristics of methane-air premixed gas, pressure and temperature sensors were arranged in a square explosion experimental pipeline to perform explosion experiments of methane-air premixed gas under different methane concentration gradients. The results showed that with increase in concentration gradient, the average flame velocity and the maximum explosion pressure of methane-air premixed gas in the pipeline increase firstly and then decrease, and both reach the maximum when the concentration gradient is 1.0%; the rising rate of explosion pressure increases firstly and then decreases with increase in concentration gradient, and reaches the maximum when the concentration gradient is 1.5%; with increase in concentration gradient, the time to reach the maximum explosion pressure presents a reciprocating trend; with increase in concentration gradient, the explosion temperature of methane-air mixture firstly increases and then decreases.更多还原