Fundamental understanding of turbulent flame propagation in droplet-laden reactant mixture based on experimental and numerical investigations

基于实验和数值研究对含液滴反应混合物中湍流火焰传播的基本理解

• 批准号: EP/J021997/1
• 负责人: Nilanjan Chakraborty
• 金额: $ 34.1万
• 依托单位: Newcastle University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2012
• 资助国家: 英国
• 起止时间: 2012 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FJ021997%2F1
• 关键词: Fundamental; understanding; turbulent; flame; propagation

This project aims to investigate the statistical behaviour of turbulent flame propagation in a droplet-laden mixture using both experiments and Direct Numerical Simulations (DNS). The effects of turbulence intensity, integral length scale of turbulence, group number, volatility, droplet diameter, and equivalence ratio (both overall and gaseous phase) on turbu-lent flame propagation in droplet-laden mixtures will be analysed in detail by carrying out extensive parametric studies to obtain fundamental physical understanding of the influences of these parameters on the flame propagation statistics, burning rate and pollutant formation (e.g. NOx generation rate). Although addressed to a limited extent by experimental studies in the past, an extensive DNS based investigation of this problem, supported by, and directly compared with, experimentation is yet to be reported in the existing literature. In this project, the fundamental physical understanding from both DNS and experimental data will be used to develop models in the context of the flamelets and Conditional Moment Closure (CMC) based reaction rate closures. Fundamental understanding of flame propagation into droplet-laden mixtures and its modelling will provide a robust cost-effective Computational Fluid Dynamics (CFD) based design tool for reliable, energy-efficient and cleaner combustion devices involving droplet-laden mixtures (e.g. Direct Injection (DI) engines, Compression Ignition (CI) engines, Aero gas turbines etc.).

本项目旨在通过实验和直接数值模拟来研究湍流火焰在液滴混合物中传播的统计行为。通过开展广泛的参数研究，将详细分析湍流强度、湍流积分长度尺度、群数、挥发度、液滴直径和当量比(总体和气相)对湍流火焰传播的影响，以获得这些参数对火焰传播统计、燃烧速率和污染物形成(例如NOx生成率)的影响的基本物理理解。虽然过去的实验研究在一定程度上解决了这个问题，但在现有的文献中，还没有报道过在实验的支持下、并与实验进行直接比较的、基于域名系统的对该问题的广泛调查。在这个项目中，将使用来自DNS和实验数据的基本物理理解来开发基于火焰面和条件矩闭合(CMC)的反应速率闭合的模型。对火焰在液滴混合物中传播及其建模的基本了解将为涉及液滴混合物的可靠、节能和清洁的燃烧设备(如直接喷射(DI)发动机、压缩点火(CI)发动机、航空燃气轮机等)提供基于计算流体动力学(CFD)的可靠、高效和清洁的设计工具。

项目成果

Scalar dissipation rate transport conditional on flow topologies in different regimes of premixed turbulent combustion

预混湍流燃烧不同状态下流动拓扑条件下的标量耗散率传输

• DOI: 10.1016/j.proci.2018.06.092
• 发表时间: 2019
• 期刊: Proceedings of the Combustion Institute
• 影响因子: 3.4
• 作者: Chakraborty N

Effects of Turbulent Reynolds Number on Turbulent Scalar Flux Modeling in Premixed Flames Using Reynolds-Averaged Navier-Stokes Simulations

湍流雷诺数对使用雷诺平均纳维-斯托克斯模拟的预混火焰湍流标量通量建模的影响

• DOI: 10.1080/10407782.2014.955375
• 发表时间: 2015
• 期刊: Applications
• 作者: Chakraborty N

Statistics of reaction progress variable and mixture fraction gradients of a pulverised coal jet flame using Direct Numerical Simulation data

• DOI: 10.1016/j.proci.2018.06.223
• 发表时间: 2019
• 期刊: Proceedings of the Combustion Institute
• 影响因子: 3.4
• 作者: U. Ahmed;C. T. d’Auzay;Masaya Muto;N. Chakraborty;R. Kurose

On conditions for self-sustained combustion of pulverised coal particle-laden mixtures following localised forced ignition: A Direct Numerical Simulation analysis

• 发表时间: 2015
• 作者: T. Brosh;F. Marincola;D. Wacks;D. Patel;N. Chakraborty

Effects of Equivalence Ratio and Turbulent Velocity Fluctuation on Early Stages of Pulverized Coal Combustion Following Localized Ignition: A Direct Numerical Simulation Analysis

• DOI: 10.1021/ef501171n
• 发表时间: 2014-08
• 期刊: Energy & Fuels
• 影响因子: 5.3
• 作者: T. Brosh;N. Chakraborty