介绍了一种多时间尺度模拟方法和动态自适应机理方法。在模拟过程中，根据当时的热化学状态动态获得即时简化机理，通过计算各个组分的特性时间，依据其特征时间将基元组分和反应划分为不同的计算组，各个组采用不同的时间步长进行计算。基于该方法，采用详细化学机理对癸烷及庚烷自燃着火过程进行模拟，并将模拟结果与全过程采用详细机理的隐式积分算法进行比较。结果证明该方法具有很高的精度，同时，该方法能大大提高计算的速度。该方法的应用将有助于实现燃烧问题的高效精确模拟。
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.
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