论文部分内容阅读
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。
A multi-time scale simulation method and a dynamic adaptive mechanism method are introduced. In the process of simulation, according to the thermal state at that time, the dynamic mechanism of instant reduction was obtained. By calculating the characteristic time of each component, the elementary components and reactions were divided into different calculation groups according to their characteristic time, and each group took different time Step size calculation. Based on this method, the detailed chemical mechanism was used to simulate the ignition process of decane and heptane spontaneous combustion, and the simulation results were compared with the implicit integration algorithm using detailed mechanism in the whole process. The results show that the method has a high accuracy, at the same time, this method can greatly improve the calculation speed. The application of this method will help to achieve efficient and accurate simulation of combustion problems.