在长35 m、截面积为200 mm×200 mm的封闭管道中，选取点火能量和瓦斯体积分数2个影响因素，采用正交试验法对瓦斯爆炸最大火焰传播速度、瓦斯爆炸压力峰值、压力上升速率进行研究，得出了在不同点火能量和不同瓦斯体积分数条件下的瓦斯−空气混合气体爆炸显著性影响规律。结果表明：在相同瓦斯体积分数情况下，火焰传播速度从点火位置开始，随着传播距离的增加而逐渐增大，在泄爆舱入口处达到最大值，点火能量越大，火焰传播速度越快；在相同点火能量情况下，最大火焰传播速度随瓦斯体积分数升高先上升后下降，瓦斯体积分数为9.5%时最大；从极差和显著性影响分析可知，瓦斯体积分数、点火能量和两者交互作用对最大火焰传播速度均有显著性影响，显著性影响由大到小为瓦斯体积分数>点火能量>两者交互作用；在相同瓦斯体积分数情况下，瓦斯爆炸压力峰值和压力上升速率均随点火能量的增加而升高，点火能量越大，压力峰值和压力上升速率越高；在相同点火能量情况下，压力峰值和压力上升速率随瓦斯体积分数的升高先升高后降低，瓦斯体积分数为9.5%时最大；在极差和显著性影响方面，瓦斯体积分数、点火能量均对压力峰值和压力上升速率有显著性影响，且点火能量>瓦斯体积分数，两者交互作用则对压力峰值和压力上升速率没有显著性影响。

The maximum flame propagation speed, the peak pressure and the pressure rise rate of gas explosion were studied under the influence of two factors of ignition energy and gas volume fraction, by using the orthogonal experimental method in a closed pipeline with a length of 35 m and a cross-sectional area of 200 mm×200 mm. The significant impact law of gas-air mixture explosion under different ignition energy and gas volume fraction conditions was obtained. The experimental results show that under the same gas volume fraction, the flame propagation speed of gas explosion gradually increases with the extension of propagation distance from the ignition position, reaching the maximum value near the outlet, and the larger the ignition energy is, the greater the flame propagation speed is; under the same ignition energy, the maximum flame propagation speed first increases and then decreases with the increase of gas volume fraction, reaching its maximum at a gas volume fraction of 9.5%; from the analysis of range and significance effects, gas volume fraction and ignition energy and their interaction have significant effects on the maximum flame propagation speed, and the significant effects are as follows: the gas volume fraction > the ignition energy > their interaction; under the same gas volume fraction, the peak pressure and the pressure rise rate of gas explosion both increase with the increase of ignition energy, the larger the ignition energy, the higher the peak pressure and the pressure rise rate; under the same ignition energy, the peak pressure and the pressure rise rate first increase and then decrease with the increase of gas volume fraction, with the maximum value at a gas volume fraction of 9.5%; in the aspects of range and significance effects, the gas volume fraction and the ignition energy have a significant impact on the peak pressure and the pressure rise rate, the significance effects are as follows: the ignition energy > the gas volume fraction, and the interaction between the two has no significant effect on the peak pressure and the pressure rise rate.