基于双进度变量的非预混火焰NO生成大涡模拟研究
Large Eddy Simulation of NO Formation in Non-Premixed Flames Based on Dual-Scale Flamelet/Progress Variable Model
万佳伟 1魏正昀 1蒋旭东 1郭军军 2柳朝晖1
作者信息
- 1. 华中科技大学能源与动力工程学院煤燃烧国家重点实验室,武汉 430074
- 2. 华中科技大学能源与动力工程学院煤燃烧国家重点实验室,武汉 430074;Clean Combustion Research Center,King Abdullah University of Science and Technology,Thuwal 23955,Saudi Arabia
- 折叠
摘要
本文基于火焰面/进度变量(FPV)模型框架,提出了一种双进度变量NO输运修正模型.将该模型与大涡模拟相结合,对Sandia非预混甲烷射流火焰开展了数值模拟.结果表明,该模型对于NO浓度的预测精度相比于文献中结果显著提升.进一步详细分析了具有火焰不稳定性的Sandia火焰F的NO生成特性,当雷诺数从22400升高至44800时,火焰F相比于火焰D,中心轴线处的NO峰值下降约28％.模拟结果成功捕捉到了雷诺数升高导致的强局部熄火现象,以及该条件下火焰温度降低,NO生成受到抑制的趋势.
Abstract
Based on the flamelet/progress variable(FPV)model,a dual-scale flamelet/progress variable model with transported NO correction is proposed.On the basis of the proposed model,the large eddy simulation of Sandia non-premixed methane jet flames is conducted.The results show that the proposed model significantly improves the prediction accuracy of NO.Moreover,the large eddy simulations of sandia flame F with local extinction are conducted to explore the NO formation characteristics in the condition of flame instability.The comparisons show that with the Reynolds number increasing from 22400 to 44800,flame F shows about 28％decrease in peak NO magnitude at the central axis compared to flame D.The proposed model successfully captures the local extinction caused by the increase of Reynolds number and the suppressed trend on the NO formation.
关键词
火焰不稳定性/大涡模拟/火焰面/进度变量模型/NO生成Key words
flame instability/large eddy simulation/flamelet/progress variable model/NO forma-tion引用本文复制引用
基金项目
国家自然科学基金项目(51906075)
国家重点研发计划(2019YFE0100100)
出版年
2024
NETL
NSTL
维普
万方数据