关键词: 爆轰波, 弯管, 基元反应模型, DCD格式

Abstract: The chemically reacting flow-field of a detonation wave in a bend is simulated by CFD method. The dispersion-controlled dissipative scheme (DCD) is adopted to solve two-dimensional Euler equations implemented with detailed chemical reaction kinetics of hydrogen-oxygen-argon mixture. The fractional step method is applied to treat the stiff problem arising from computation of chemical reaction flow. From the numerical results it is observed that as the curvature of the bend changes,different detonation phenomena occurred along the wall of the bended pipe.If detonation wave propagating through bend with little curvature,the affection of the expansion wave is then stronger to induce the decouple process of the reaction zone and the leading shock.Re-setup of detonation can be completed when the overdriven detonation from another wall reignites the gas mixture in the decoupled zone,and then high overpressure impacts on the bend wall.

Key words: detonation wave, bend, detailed chemically reacting model, DCD scheme