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燃烧数值模拟有助于认识诸如点火、火焰传播、火焰不稳定、熄火、湍流与火焰相互作用等基础燃烧过程、揭示其中的燃烧机理,是开发新型替代燃料和高性能燃烧器的重要研究手段.然而,燃烧过程涉及的广泛时空尺度和复杂物理化学过程给其数值模拟带来了巨大挑战.为了实现燃烧过程的高效精确数值模拟,必须解决复杂化学反应机理导致刚性问题和数值求解方程过多的问题.本文介绍了复杂化学反应机理处理方法的研究进展、化学反应机理简化方法和自适应化学反应机理(针对复杂化学反应机理导致数值求解方程过多的问题)、几种常用的高效积分算法和降维/重构方法(针对复杂化学反应机理导致常微分方程组刚性问题).为了有效地模拟多尺度燃烧过程,接下来需要进一步发展和综合应用自适应网格技术、高效积分算法与自适应时间步长技术、化学反应机理简化与自适应化学反应机理技术、以及自适应物理/化学模型技术.
Combustion numerical simulation is helpful to understand the basic combustion processes such as ignition, flame propagation, flame instability, flameout, turbulence and flame interaction, reveal the combustion mechanism, and is an important research method to develop new alternative fuels and high performance combustors. However, the wide range of spatio-temporal scales and complex physicochemical processes involved in the combustion process pose a great challenge to the numerical simulation.In order to realize the highly accurate numerical simulation of the combustion process, it is necessary to solve the problem that the complex chemical reaction mechanism leads to the rigid problem and the numerical solution equation is too much Problem.This paper introduces the research progress of complex chemical reaction mechanism processing methods, chemical reaction mechanism simplification method and adaptive chemical reaction mechanism (for complex chemical reaction mechanism lead to numerical solution equation too many problems), several commonly used efficient integration algorithm and Dimension Reduction / Reconstruction Method (In view of the complex chemical reaction mechanism leads to the problem of ordinary differential equations stiffness.) In order to effectively simulate the multi-scale combustion process, the next need to further develop and apply adaptive grid technology, efficient integration algorithm and adaptive Time step technology, chemical reaction machine Simplify and adaptive chemical reaction mechanism technology, as well as adaptive physical / chemical model technology.