Multi time scale modelling and dynamic adaptive chemistry mechanism of combustion process

作者：Gou Xiao Long^*; Gui Ying; Wang Wei

来源：Journal of Engineering Thermophysics, 2012, 33(12): 2207-2210.

• Adaptive Chemistry
• Characteristic time
• Combustion characteristics
• Combustion pro-cess
• Computation speed
• Detailed chemical kinetic
• Different time steps
• Implicit ODE
• Multi-time scale
• N-decane
• n-Heptanes
• Time-scales

In the present study, a multi time scale (MTS) method and dynamic adaptive chemistry (DAC) mechanism are developed. The characteristic time of each species is gotten on each output time scale, and the characteristic time is used to divide species into different groups which are calculated with different time steps. The method is applied to ignition of n-decane/air and n-heptane/air and compared with the implicit ODE solver by using detailed chemical kinetic mechanisms. The results show that the scheme can accurately reproduce the combustion characteristics. In addition, the computation speed for MTS can be greatly enhanced. As such, MTS can be used in the combustion process modelling effectively and accurately.

• 出版日期2012