Estimation of the specific heat capacity ratio of gasoline vapor based on the relationship between the maximum pressure rise rate and initial pressure of gas explosion

Abstract

Gasoline is volatile and can form a flammable gas mixture with air easily. Researches on the gas explosions still need to be developed so that more effective explosion prevention techniques and measures can be proposed. The maximum overpressure rise rate and deflagration index are two important parameters for measuring gas explosion damage power. The relationship between these two parameters and the initial pressure is controversial. Razus et al. insisted that it was a linear relationship, however, Faghih et al. declared that it was an exponential relationship. In this paper, the relationship between the maximum pressure rise rate (the deflagration index) and the initial pressure is deduced and discussed. The results show that the relationship is still linear. On this basis, the deduced relationship formula is used to estimate the specific heat capacity of gasoline vapor. Results show that the estimated value is reasonable and acceptable.