Study on combustion characteristics and analysis method optimization of methanol laminar burning under high pressure and high temperature initial conditions

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-05-09 DOI:10.1016/j.combustflame.2025.114215

Peng Wang , Yang Wang , Mingfei Lu , Wuqiang Long , Pengbo Dong , Wentao Zhao , Hua Tian , Ge Xiao , Jingchen Cui , Jianlin Cao

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引用次数: 0

Abstract

Low-carbon methanol fuel has garnered global interest, and accurately quantifying its laminar combustion characteristics under high-temperature and high-pressure conditions is critical for practical applications. This study investigates the synergistic impact of multiple key parameters on the calculating accuracy of non-stretching methanol flame propagation speed (S_L) and Markstein length (Lb) systematically, including extracting flame radius (EFR) method, time intervals (Ti), flame radius range (FRR:Ri1-Ri2), and extrapolation equations (EE). Schlieren experiments were conducted at 500 K and 0.75–1.25 MPa with CO₂ dilution rates (DR) of 20–30 %, examining three stability cases with Lewis number (Le) is < 1, ≈1, and > 1. Results showed that FRR optimization contributed 63.6 % to S_L accuracy under Le <1 conditions, with Ri2 accounted for 35 %. These findings indicate that FRR plays a dominant role in stabilizing flame propagation and minimizing edge effects during combustion. However, as Le increased, FRR’s influence decreased due to reduced flame-core interactions, while EFR and Ti became significant. Specifically, the R_elec method reduced S_L errors more effectively than that of R_area, because it mitigated distortions caused by ignition electrode effects. Optimal time interval (T_s) decreased from 0.75 ms at Le <1 to 0.25 ms at Le >1, reflecting the need for finer temporal resolution to capture rapid instabilities associated with intensified flame wrinkling and cellular formation. EE performance depended on FRR and EFR optimization heavily. These findings demonstrate that the interactions among Ti, FRR, and EE significantly influence the accuracy of S_L calculations, and the optimized Ti and FRR can mitigate errors in EE-based extrapolations effectively. By optimizing key parameters, S_L errors were reduced from as high as 13.4 % to as low as 0.9 %, particularly under unstable combustion conditions. The parameter optimization strategies proposed are expected to provide actionable insights for improving combustion diagnostics, enhancing combustion efficiency, reducing emissions, and advancing methanol engine design.

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高压高温初始条件下甲醇层流燃烧特性研究及分析方法优化

低碳甲醇燃料已引起全球关注，准确量化其在高温高压条件下的层流燃烧特性对实际应用至关重要。本研究系统地研究了提取火焰半径（EFR）方法、时间间隔（Ti）、火焰半径范围（FRR:Ri1-Ri2）和外推方程（EE）等多个关键参数对非拉伸甲醇火焰传播速度（SL）和Markstein长度（Lb）计算精度的协同影响。在500 K， 0.75 ~ 1.25 MPa， CO₂稀释率（DR）为20 ~ 30%的条件下进行纹影实验，考察了Lewis数（Le）为<的3种稳定性情况；1,≈1,>；1. 结果表明，在Le <；1条件下，FRR优化对SL精度的贡献为63.6%，而Ri2条件下FRR优化对SL精度的贡献为35%。这些结果表明，在燃烧过程中，FRR在稳定火焰传播和减少边缘效应方面起着主导作用。然而，随着Le的增加，FRR的影响减小，因为火焰-核心相互作用减少，而EFR和Ti变得显著。具体而言，R_elec方法比R_area方法更有效地降低了SL误差，因为它减轻了由点火电极效应引起的畸变。最佳时间间隔（Ts）从Le <；1时的0.75 ms下降到Le >；1时的0.25 ms，反映出需要更精细的时间分辨率来捕捉与火焰起皱和细胞形成加剧相关的快速不稳定性。EE性能在很大程度上取决于FRR和EFR的优化。这些结果表明，Ti、FRR和EE之间的相互作用显著影响了SL计算的准确性，优化后的Ti和FRR可以有效地减轻基于EE的外推的误差。通过优化关键参数，尤其在不稳定燃烧条件下，SL误差从高达13.4%降至0.9%。所提出的参数优化策略有望为改善燃烧诊断、提高燃烧效率、减少排放和推进甲醇发动机设计提供可操作的见解。

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

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.