Modeling the Ignition of Large Diameter Rods and Pipes in Flowing Oxygen

摘要

The recent Industry-Sponsored Metals Combustion Test Program (96-1) involved promoted-ignition and burning of 316L stainless steel rods (1.27 cm diameter) and Sch. 80 and XXS pipe (11/4 in. nominal diameter) in both static and flowing oxygen. These tests demonstrated difficulties igniting large samples in flowing oxygen. This work examines and models the ignition of metals based on the Standard Test Method for Determining the Combustion Behavior of Metallic Materials in Oxygen-Enriched Atmospheres (ASTM G124) configuration test. Appropriate mass and energy conservation balances are developed and validated against the experimental results of Phase Ⅰ and Ⅱ tests. Parametric studies demonstrate the effects of system pressure and flow on ignition. These results are compared to current theories of ignition, and future work is suggested.