Backdrafts are violent events that occur when oxygen is suddenly introduced to an oxygen-depleted compartment fire and are primarily driven by the presence of gravity currents. However, with human travel potentially expected beyond the confines of earth gravity, it is not clear how the magnitude of the gravity constant can contribute to the intensity of these events. This issue can be relevant when dealing with fires on space stations or on future bases on the Moon and Mars. In this study, we carry out backdraft simulations in a compartment under different reduced gravity conditions using the NIST Fire Dynamics Simulator (FDS) code. A combustion compartment, initially containing under-ventilated heated methane, is opened to the surroundings using a vertical opening slot. Through the bottom of the opening flows a gravity current of oxygen. When the current reaches the far wall of the combustion compartment, the mixture is ignited, and a violent backdraft event occurs. Measures of heat release, fire development, and pressure rise suggest that the effects of backdraft are highly nonlinear based on the gravity constant. Even small values of the gravity constant (as low as 0.01g) can trigger relatively strong backdrafts.

回风是暴力事件，是在氧气突然引入贫氧舱室火灾时发生的，主要是由于重力流的存在而引起的。但是，由于人们的出行可能超出地球重力的范围，因此尚不清楚重力常数的大小如何影响这些事件的强度。在处理空间站或月球和火星未来基地的火灾时，此问题可能很重要。在这项研究中，我们使用NIST火灾动力学模拟器（FDS）代码在不同的重力降低条件下在隔室中进行了回风模拟。最初包含通风不良的加热后的甲烷的燃烧室使用垂直开口槽向周围环境开放。氧气的重力流通过开口的底部。当电流到达燃烧室的远端壁时，混合物被点燃，并发生剧烈的逆流事件。放热，着火和压力上升的测量结果表明，基于重力常数，回风的影响是高度非线性的。甚至很小的重力常数值（低至0.01）g）可能会触发相对强势的回传。