Study on characterization of flame propagation of spontaneous ignition caused by high-pressure hydrogen leakage

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2024-11-05 DOI:10.1016/j.csite.2024.105415

Gan Cui , Yixuan Li , Qiaosheng Zhang , Juerui Yin , Di Wu , Xiao Xing , Jianguo Liu

{"title":"Study on characterization of flame propagation of spontaneous ignition caused by high-pressure hydrogen leakage","authors":"Gan Cui , Yixuan Li , Qiaosheng Zhang , Juerui Yin , Di Wu , Xiao Xing , Jianguo Liu","doi":"10.1016/j.csite.2024.105415","DOIUrl":null,"url":null,"abstract":"<div><div>As an ideal energy source, hydrogen is highly susceptible to spontaneous ignition once leaked, which is an urgent issue that needs to be addressed. Based on the shock tube model, this paper investigates flame propagation under various pressures, tube lengths, and diameters by employing the LES approach and a detailed hydrogen/air combustion mechanism. The results indicate that within the tube, the ignition kernels gradually evolve into tulip flames when specific conditions are satisfied. As pressure and tube length increase, the likelihood of forming a complete flame rises significantly; with the increase of tube diameter, the flame front is flatter and the flame intensity is more uniformly distributed. Furthermore, this paper develops a model to predict the formation of a complete flame: <span><math><mrow><msub><mi>P</mi><mi>b</mi></msub><mo>/</mo><msub><mi>P</mi><mi>a</mi></msub><mo>=</mo><mn>570.64</mn><msup><mrow><mo>(</mo><mrow><mi>L</mi><mo>/</mo><mi>D</mi></mrow><mo>)</mo></mrow><mrow><mo>−</mo><mn>0.6</mn></mrow></msup></mrow></math></span>. Outside the tube, once the intact flame passes out of the tube and evolves into a jet flame, structures such as flame envelopes and jet vortices will appear. Higher release pressures make it more difficult for the flame to propagate steadily, whereas increasing tube length and diameter promotes combustion and sustains the flame outside the tube.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"64 ","pages":"Article 105415"},"PeriodicalIF":6.4000,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Case Studies in Thermal Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214157X24014461","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"THERMODYNAMICS","Score":null,"Total":0}

引用次数: 0

Abstract

As an ideal energy source, hydrogen is highly susceptible to spontaneous ignition once leaked, which is an urgent issue that needs to be addressed. Based on the shock tube model, this paper investigates flame propagation under various pressures, tube lengths, and diameters by employing the LES approach and a detailed hydrogen/air combustion mechanism. The results indicate that within the tube, the ignition kernels gradually evolve into tulip flames when specific conditions are satisfied. As pressure and tube length increase, the likelihood of forming a complete flame rises significantly; with the increase of tube diameter, the flame front is flatter and the flame intensity is more uniformly distributed. Furthermore, this paper develops a model to predict the formation of a complete flame:

P_{b} / P_{a} = 570.64 {(L / D)}^{- 0.6}

. Outside the tube, once the intact flame passes out of the tube and evolves into a jet flame, structures such as flame envelopes and jet vortices will appear. Higher release pressures make it more difficult for the flame to propagate steadily, whereas increasing tube length and diameter promotes combustion and sustains the flame outside the tube.

查看原文本刊更多论文

高压氢泄漏导致自燃的火焰传播特性研究

作为一种理想的能源，氢一旦泄漏极易自燃，这是一个亟待解决的问题。本文以冲击管模型为基础，采用 LES 方法和详细的氢气/空气燃烧机理，研究了不同压力、管子长度和直径下的火焰传播。结果表明，在满足特定条件的情况下，管内的点火核会逐渐演变成郁金香火焰。随着压力和管道长度的增加，形成完整火焰的可能性显著提高；随着管道直径的增加，火焰前沿更加平坦，火焰强度分布更加均匀。此外，本文还建立了一个预测完全火焰形成的模型：Pb/Pa=570.64(L/D)−0.6.在管外，完整火焰一旦冲出管外并演变成喷射火焰，就会出现火焰包络和喷射涡流等结构。较高的释放压力会使火焰更难稳定传播，而增加管道长度和直径则会促进燃烧并使火焰在管外持续燃烧。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.