A combined experimental and numerical investigation of premixed flame-wall interaction in turbulent boundary layers

湍流边界层中预混火焰壁相互作用的实验与数值联合研究

• 批准号: EP/V003534/1
• 负责人: Nilanjan Chakraborty
• 金额: $ 98.99万
• 依托单位: Newcastle University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FV003534%2F1
• 关键词: combined; experimental; numerical; investigation; premixed

The presence of walls alters the thermo-chemical and fluid-dynamical processes associated with turbulent premixed flames. The increasing demands for light-weight combustors make flame-wall interactions (FWI) inevitable, which influence the cooling load, thermal efficiency and pollutant emission in these applications. However, this aspect has not yet been sufficiently analysed in the existing turbulent reacting flow literature because of the challenge this poses for both experimental and numerical investigations in terms of spatial and temporal resolutions among others. Therefore, a thorough physical understanding of the FWI mechanism is necessary to develop and design more energy-efficient and environmentally-friendly combustion devices. In this project, recent advances of both high-performance computing and experimental techniques will be utilised to analyse and model premixed FWI in turbulent boundary layers (TBLs). The proposed analysis will consider different FWI configurations (based on the orientation of the mean flame normal with respect to the wall) in turbulent channel flows and unconfined boundary layers (BLs) using state-of-the-art experiments and high-fidelity Direct Numerical Simulations for different wall boundary conditions. Experiments will utilize a suite of advanced laser diagnostics, providing new simultaneous measurement capabilities. DNS will simulate the turbulent flow without any recourse to physical approximations. The fundamental physical insights obtained from DNS and experimental data will be used to develop a novel hybrid RANS/LES approach for device-scale simulation of FWI, building on expertise in the context of Flame Surface Density (FSD) and Scalar Dissipation Rate (SDR) closures for Reynolds Averaged Navier Stokes (RANS) and Large Eddy Simulations (LES). The newly-developed models will be implemented to carry out hybrid RANS/LES of experimental configurations for the purpose of model validation. The project will offer robust and cost-effective Computational Fluid Dynamics (CFD) design tools for fuel-efficient and low-emission combustion devices (e.g. gas turbines, micro-combustors and automotive engines).

壁的存在改变了与湍流预混火焰相关的热化学和流体动力学过程。随着对燃烧室轻量化要求的提高，火焰-壁面相互作用（FWI）不可避免地影响到燃烧室的冷负荷、热效率和污染物排放。然而，这方面还没有得到充分的分析，在现有的湍流反应流文献，因为这对实验和数值研究的空间和时间分辨率等方面的挑战。因此，有必要对FWI机理进行深入的物理理解，以开发和设计更节能和环保的燃烧装置。在这个项目中，高性能计算和实验技术的最新进展将被用来分析和模拟湍流边界层（TBL）中的预混FWI。拟议的分析将考虑不同的FWI配置（基于平均火焰法线相对于壁的方向）在湍流通道流和无约束边界层（BL）使用国家的最先进的实验和高保真直接数值模拟不同的壁边界条件。实验将利用一套先进的激光诊断技术，提供新的同步测量能力。DNS将模拟湍流，而无需任何物理近似。从DNS和实验数据中获得的基本物理见解将用于开发一种新的混合RANS/LES方法，用于FWI的设备规模模拟，建立在火焰表面密度（FSD）和标量耗散率（SDR）封闭雷诺平均纳维尔斯托克斯（RANS）和大涡模拟（LES）的背景下的专业知识。新开发的模型将实施进行混合RANS/LES的实验配置的模型验证的目的。该项目将提供强大且具有成本效益的计算流体动力学（CFD）设计工具，用于燃油效率和低排放燃烧设备（例如燃气轮机，微型燃烧室和汽车发动机）。

项目成果

Premixed Flame-Wall Interaction and Heat Transfer Characteristics in Turbulent Boundary Layers: Insights based on Direct Numerical Simulations

湍流边界层中的预混合火焰壁相互作用和传热特性：基于直接数值模拟的见解

• 发表时间: 2022
• 作者: Chakraborty, N

Flame self-interaction during turbulent boundary layer flashback of hydrogen-rich premixed combustion

富氢预混燃烧湍流边界层回火过程中火焰自相互作用

• DOI: 10.1103/physrevfluids.8.023202
• 发表时间: 2023
• 期刊: Physical Review Fluids
• 影响因子: 2.7
• 作者: Ahmed U

Influence of Flow Configuration and Thermal Wall Boundary Conditions on Turbulence During Premixed Flame-Wall Interaction within Low Reynolds Number Boundary Layers

低雷诺数边界层内预混火焰壁相互作用过程中流动形态和热壁边界条件对湍流的影响

• DOI: 10.1007/s10494-023-00437-y
• 发表时间: 2023
• 期刊: Flow, Turbulence and Combustion
• 作者: Ahmed U

Influence of flow configuration and wall boundary conditions on turbulence during premixed flame-wall interaction within boundary layers

边界层内预混火焰-壁面相互作用过程中流动形态和壁面边界条件对湍流的影响

• 发表时间: 2022
• 作者: Ahmed U

Assessment of Bray Moss Libby formulation for premixed flame-wall interaction within turbulent boundary layers: Influence of flow configuration

• DOI: 10.1016/j.combustflame.2021.111575
• 发表时间: 2021-07-17
• 期刊: COMBUSTION AND FLAME
• 影响因子: 4.4
• 作者: Ahmed, Umair;Chakraborty, Nilanjan;Klein, Markus
• 通讯作者: Klein, Markus