发动机爆震室气相化学反应机理及爆轰波性质的数值研究

doi:10.12066/j.issn.1007-2861.2216

Abstract

Abstract:

The strong nonlinear coupling of gas dynamics and chemical reactions exists in the structure of detonation wave. Based on sensitivity analysis, a 20-step element reaction model and 9-step reaction model are utilized with Euler equations. Roe scheme is used to solve the convective term and second order upwind format is used for interpolation. A numerical study on the detonation of H₂/O₂ in a pulse detonation engine is conducted. Calculated detonation parameters agree with CJ theory and experimental data, which show that the physical models with chemical reactions used in this study are correct. In addition, the detonation cellular structure is numerically analyzed. The 20-step reaction model can describe the collision and evolution of the triple point more accurately than the 9-step reaction model. It can also better explain the decoupling between reaction zone and incident shock wave as well as strong coupling with Mach stem. Therefore, the effects of inert-gas (Ar) dilution and the initial pressure of the gas phase on detonation in a detonation chamber are discussed based on the 20-step reaction model.

Key words: element reaction, sensitivity analysis, detonation cellular structure, triple point collision

CLC Number:

O381

RAO Feixiong, DING Jue, WENG Peifen, LI Xiaowei. Numerical study on gasous chemical reaction mechanism and detonation wave in the detonation chamber of engine[J]. Journal of Shanghai University（Natural Science Edition）, 2020, 26(4): 606-616.

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Numerical study on gasous chemical reaction mechanism and detonation wave in the detonation chamber of engine

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