| 英文摘要 |
As the global energy transition moves toward ''Net-Zero Emissions,'' high-energy-density storage systems and aerospace technologies are increasingly deployed in high-altitude and controlled-pressure environments. Low-pressure environments exert a significant, nonlinear modulation of combustion kinetics, challenging the foundations of traditional fire science, which is predicated on natural convection. This study provides a systematic reanalysis of experimental data on lithium-ion batteries, solid cellulosics, and liquid fuels to reveal fundamental shifts in heat and mass transfer mechanisms under pressure gradients. The results identify a dual competition between ''inhibition'' and ''promotion'' mechanisms: while reduced pressure lowers the oxygen partial pressure, inhibiting macroscopic heat release (e.g., an 18% peak temperature drop at 40 kPa), the decay of the natural convection coefficient triggers intense thermal accumulation and detection lags (with total reaction duration increasing by ~36%). For liquid fuels, pressure-induced boiling-point depression accelerates the transition from liquid-phase to gas-phase controlled flame spread. Furthermore, this study employs a System Dynamics (SD) framework to map microscopic physical shifts onto a coupled risk model of technical detection blind zones and regulatory lags. The findings demonstrate that neglecting enhanced radiative feedback during pressure transients poses critical failure risks to existing fire protection systems. This work establishes key theoretical criteria for refining fire safety standards and developing intelligent sensing technologies in extreme environments. |