Experimental and numerical study on the effect of diluents on laminar burning velocities of near-limit hydrogen flames at normal and reduced pressures

IF 7.5 1区 工程技术 Q2 ENERGY & FUELS
Fuel Pub Date : 2025-10-08 DOI:10.1016/j.fuel.2025.137031
Senlin Lyu, Yunyang Liu, Erjiang Hu, Geyuan Yin, Zuohua Huang
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引用次数: 0

Abstract

In this study, the effects of diluents (CO2, N2, AR and HE) and pressures on laminar burning velocity (LBV) of near-limit H2/Air/diluent flames were investigated experimentally and computationally. The LBVs of H2/Air at CO2 and N2 dilution at varying equivalence ratios (ϕ) and dilution ratios (up to 52 % by volume) under normal and reduced pressures were measured using a constant volume vessel. Several H2 kinetic models (FFCM-1, NUIG 2013, Davis model, Sun model, Dryer model and Li model) were compared and validated against experimental data. The fictitious dilution gas method was applied to investigate the chemical, physical, and global effects of the four diluents. Corresponding kinetic analysis was conducted to gain deep insight of the combustion process of near-limit H2 flames. The results show that the measured minimum LBV for H2/Air/diluent flames is yield below 2 cm/s and the models prediction results are significantly lower than measured values. Inhibition effect on LBV is CO2 > N2 > AR > HE. CO2 exists the strongest chemical effect to suppress LBV. HE exists the weakest inhibition effect, benefiting from its highest thermal diffusivity, as well as its low specific heat capacity. A reversal of sensitivity was observed at 40 % CO2 dilution with ϕ = 0.8. The sensitivity of the reaction H + O2 + M = HO2 + M increases with increasing dilution ratio, and the diluent as the third body of the system, M, controls the rate of the reaction. The difference in rate of this reaction may be responsible for the discrepancy between model predictions and experimental values.
常压和减压下稀释剂对近极限氢火焰层流燃烧速度影响的实验和数值研究
本文研究了稀释剂(CO2、N2、AR和HE)和压力对近极限H2/Air/稀释剂火焰层流燃烧速度(LBV)的影响。H2/Air在CO2和N2稀释下,在不同的等效比(ϕ)和稀释比(高达52%体积)下,在正常和减压下使用定容容器测量LBVs。比较了几种H2动力学模型(FFCM-1、NUIG 2013、Davis模型、Sun模型、Dryer模型和Li模型),并与实验数据进行了验证。虚构的稀释气体方法被应用于研究化学,物理和四种稀释剂的整体效应。为了深入了解近极限H2火焰的燃烧过程,进行了相应的动力学分析。结果表明,H2/Air/稀释剂火焰的最小LBV值小于2 cm/s,模型预测结果明显低于实测值。对LBV的抑制作用为CO2 >; N2 > AR >; HE。CO2对LBV的抑制作用最强。HE的抑制作用最弱,这得益于其最大的热扩散系数和较低的比热容。在40%的CO2稀释下,观察到灵敏度的反转,其中φ = 0.8。反应H + O2 + M = HO2 + M的敏感性随稀释比的增大而增大,稀释剂作为体系的第三体M控制反应速率。这种反应速率的差异可能是造成模型预测与实验值之间差异的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Fuel
Fuel 工程技术-工程:化工
CiteScore
12.80
自引率
20.30%
发文量
3506
审稿时长
64 days
期刊介绍: The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.
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