In order to investigate thermal response of explosive at fast cook-off environment,the fast cook-off tests for GHL explosive,subjected to external fire scenario,were carried out.The ignition time was measured.A thermal reaction model of GHL explosive was established.The external flame flow and decomposing heat of explosive were considered.The numerical simulation of cook-off test was conducted by computational fluid dynamics(CFD)software,FLUENT.Comparing the calculated results with the measured,external heat flow and kinetic parameters of GHL explosive were achieved.Ignition temperature,ignition position and temperature distribution in explosive were analyzed.The optimization of fuel pool size was also discussed by calculations.The measured results show that only burning reactions occurred during the tests.The ignition time and ignition temperature were 43 s and 583 K respectively.The ignition position lied in the underside of both ends of cylindrical explosive,which was placed horizontally.The modeled results indicate that the optimum fuel pool is 1 000 mm wide,which can ensure complete engulfment of explosive cylinder by external fire and save fuel oil.
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