In order to investigate combined inhibition effect of vacuum chamber and inert gas on Liquefied petroleum gas (LPG) explosion, the explosion experiment was carried out on the self-built gas explosion experiment pipe (L/D = 47.5). The flame propagation and explosion pressure characteristics of LPG were investigated at different vacuum degrees and 10% CO₂ volume fraction (VF). The results showed that it is feasible to use a photosensitive solenoid valve to open the vacuum chamber. The Photoreceptor Solenoid Valve can open the vacuum chamber in time; Compared to add only 10% CO₂, after installing the vacuum chamber, the maximum pressure peaks were all delayed; The pressure drops rapidly and a short period of negative pressure appeared, and the negative pressure duration becomes shorter as the vacuum degree increases; At various vacuum degrees levels, the maximum pressure peak value occurs at 0.06 vacuum degrees, primarily due to the combined influence of residual fuel quantity, Helmholtz oscillation, and turbulence near the flame front. The $P_{\mathit{max}}$ in the pipe and the flame intensity at any position is lower than that when only adding 10% CO₂; high vacuum is more conducive to extinguish the flame and increase the thickness of the flame; the pumping effect of the vacuum chamber inhibits the rise of explosion pressure and flame propagation velocity. The combined explosion suppression is more effective on LPG explosions compared to add only 10% CO₂. When selecting vacuum degree, it is important to consider the impact of the opening time and different vacuum degree within the vacuum chamber on pressure formation and flame propagation.

为了研究真空室和惰性气体对液化石油气(LPG)爆炸的联合抑制效果，在自建的气体爆炸实验管(L/D=47.5)上进行了爆炸实验。_{研究了LPG在不同真空度和10%CO 2体积分数(VF)}下的火焰传播和爆炸压力特性。结果表明，采用光敏电磁阀打开真空室是可行的。感光电磁阀能及时打开真空室；与仅添加10%CO _2相比，安装真空室后，最大压力峰值均延迟；压力迅速下降并出现短时间的负压，且负压持续时间随着真空度的增加而变短；在不同真空度水平下，最大压力峰值出现在0.06真空度处，这主要是由于残余燃料量、亥姆霍兹振荡和火焰前锋附近湍流的综合影响。这${磷}_{\mathit{最大限度}}$管内任意位置火焰强度均低于仅添加10%CO _{2时的火焰强度}；高真空更有利于熄灭火焰，增加火焰厚度；真空室的抽气作用抑制了爆炸压力和火焰传播速度的上升。_{与仅添加10% CO 2}相比，组合抑爆对于LPG 爆炸更为有效。选择真空度时，重要的是要考虑真空室内的开启时间和不同真空度对压力形成和火焰传播的影响。