Abstract:Semi underground oil tank is often used to store gasoline, diesel oil and other flammable and explosive oil. Strong explosion pressure wave will produced during a very short period of time once meet fire, and causes serious damage and disastrous consequences. The study of oil and gas explosion loading is the basis for safety design of tank. In this paper, the characteristics of loading of gasoline-air mixture explosion in tank are experimentally studied, and the variation of the overpressure time history at different positions was obtained. The explosion pressure loading can be divided into four stages: the ignition incubation period, the accelerated mutation period, the weak oscillation period, the inertia fluctuation period, and the overpressure at the top of the tank is significantly larger than that of the wall and the bottom. The influence of initial oil gas concentration, initial ignition energy, initial temperature and other related parameters was investigated. The results shows that: the change of overpressure increased to the max and then decreased with extending concentration , and the most dangerous concentration is 1.71%. The lower the initial temperature and the greater the ignition energy, the greater the impact load value.
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