A two-dimensional numerical simulation on dynamic motion of detonation products generated by gas cloud explosion inside the multi-cabin

Abstract

[Objectives] In order to study on the dynamic motion of detonation products generated by gas cloud explosion inside the multi-cabin,[Methods] the fifth-order WENO finite difference scheme is adopted to solve the coupling of mass fraction transport equation and compressible Euler equation for the detonation products,and then a two-dimensional numerical simulation program for the gas cloud explosion in the multi-cabin is developed successfully. The reliability and correctness of this numerical simulation program is verified by virtue of the plane shock diffraction rectangular step test,after which the verified program is used to carry out the numerical simulation of the gas cloud explosion under different explosion conditions, so as to explore the influence of venting hole and afterburning energy on the dynamic motion process of the detonation products during the explosion inside the multi-cabin.[Results] The results show that increasing the size of the venting hole can accelerate the emission process of the detonation products; increasing the reaction rate constant can accelerate the expansion of the detonation products to the adjacent cabin.[Conclusions] This study can provide a reference and guidance for further exploring the expansion process of the detonation products generated by the complex multi-component combustion and the evaluation of the explosion fireball damage.

Keywords

• gas cloud explosion in multi-cabin
• blast wave
• fifth-order WENO scheme
• numerical simulation
• detonation products