基于过程变量-火焰面模型的湍流燃烧大涡模拟

Large-eddy simulation of turbulent combustion based on steady flamelet/progress variable approach

湍流燃烧常伴随着复杂的流动过程和燃烧现象.先进的燃烧模型与大涡模拟结合为模拟湍流燃烧提供了有利的工具.过程变量-火焰面模型是在火焰面模型的基础上发展起来的.由于引入了过程变量,过程变量-火焰面模型可以描述诸如局部熄火和再燃等复杂的燃烧现象.为了验证基于过程变量-火焰面模型的大涡模拟方法,近年来开展了一系列的数值模拟工作.在非预混火焰、部分预混火焰、抬升火焰、旋流火焰等火焰的模拟中,基于过程变量-火焰面模型的大涡模拟方法都得到了很好的验证.在此基础之上,基于过程变量-火焰面模型的大涡模拟也被用于燃气轮机燃烧室的模拟,并开始用于预测一些基本的燃烧现象.随着过程变量-火焰面模型的不断发展,基于过程变量-火焰面模型的大涡模拟方法将在湍流燃烧模拟中发挥更重要的作用.

Turbulent combustion is often accompanied by complex phenomena of flow and combustion. Combining with advanced combustion model, LES provides a powerful tool to simulate turbulent combustion. Based on flamelet model, with a progress variable introduced, the flamelet/progress variable approach is enabled to describe complex phenomena in turbulent combustion such as local extinction and re-ignition. Recently, in order to validate the LES based flamelet/progress variable （LES-FPV） approach, a series of numerical simulations were carried out. In the simulations of non-premixed fame, partially premixed flame, lifted flame and swirl flame, the approach showed good performance and was then used to simulate gas turbine combustor, and to predict some basic combustion phenomena. With continuous development, LES-FPV approach will play an increasingly important role in simulating turbulent combustion.