Method for theoretically predicting time history of afterburning reaction rate of internal explosion and determining energy release constant

Abstract

[Objectives] Since the afterburning effect on explosion in confined space involves complex multi-component chemical combustion process, describing the afterburning effect approximately with a simplified reaction rate model has certain rationality and engineering application value. However,it is still required to determine the means of predicting the time history of reaction rate in the model and determine an energy release constant. Therefore [Methods],a theoretical prediction method for the time history of afterburning reaction rate is proposed,and a chemical reaction kinetics method is used to determine the time of chemical reaction in internal explosion so as to determine the energy release constant.[Results] The results show that although there are certain differences between the theoretical prediction and the numerical calculation results in the early and later stages of explosion,the overall trend is in good agreement,and it is reasonable and reliable to approximately determine the final time of chemical reaction according to the chemical reaction kinetics analysis method.[Conclusions] The research results in this paper can provide certain reference and basis for the design of anti-explosion structure and assessment of damage.

Keywords

• explosion in confined space
• afterburning effect
• reaction rate model
• fifth-order WENO format
• chemical reaction kinetics
• energy release constant