細(xì)水霧及二氧化碳復(fù)合熄滅正庚烷池火的數(shù)值模擬
發(fā)布時(shí)間:2021-08-12 12:12
滅火一直是大規(guī);馂(zāi)和石油和天然氣行業(yè)十分感興趣的研究方向,本文的研究重點(diǎn)是在良好通風(fēng)的條件下,對大型正庚烷池火(D=14.2m)開展滅火模擬研究。近年來,用水作為溶劑與各種氣體以及各種活性劑混合產(chǎn)生了不同用途的泡沫滅火劑,如水成膜泡沫(AFFF)滅火劑。基于此,本文選擇細(xì)水霧與二氧化碳混合產(chǎn)生一種復(fù)合混合滅火劑,并對細(xì)水霧以及細(xì)水霧與二氧化碳混合滅火劑熄滅正庚烷油池火,分別開展了數(shù)值模擬研究。首先,我們進(jìn)行了網(wǎng)格大小的靈敏度分析,在燃料完全燃燒開始施加滅火劑進(jìn)行滅火。對于細(xì)水霧單獨(dú)滅火,為了尋求一種滅火效率更高的細(xì)水霧顆粒分布模型,我們針對兩種不同粒徑分布、大小和數(shù)量的細(xì)水霧滅火效果進(jìn)行了比較,發(fā)現(xiàn)當(dāng)細(xì)水霧粒徑較大時(shí),與Rosin-Rammler對數(shù)正態(tài)分布相比,Rosin-Rammler粒徑分布的細(xì)水霧滅火更有效。不僅如此,與較小粒徑(124.6μm)的細(xì)水霧相比,RR分布、較大粒徑(275 μm)的細(xì)水霧滅火在氣相能量平衡、熱釋放速率、溫度與輻射抑制方面更為高效。進(jìn)一步,將細(xì)水霧與二氧化碳進(jìn)行混合,與細(xì)水霧單獨(dú)采用的滅火效果進(jìn)行了對比分析。結(jié)果表明,混合滅火劑比細(xì)水霧有更好的滅火...
【文章來源】:中國科學(xué)技術(shù)大學(xué)安徽省 211工程院校 985工程院校
【文章頁數(shù)】:82 頁
【學(xué)位級別】:碩士
【文章目錄】:
摘要
ABSTRACT
Appendix
List of Abbreviations
Chapter 1 Introduction
1.1 Background
1.2 Research Objectives
1.3 Outline
Chapter 2 Computational Fluid Dynamics (CFD)
2.1 Fire Dynamics Simulator (FDS)
2.2 Particle distribution system
2.3 Mesh sensitivity
Chapter 3 Numerical Modeling of Pool Fire
3.1 Pool Fire
3.2 Classification of Pool Fire
3.3 Fire modelling
3.4 Fire suppressants
3.5 Initial conditions
3.6 Extinction Model
Chapter 4 Results and Discussion
4.1 Mesh Sensitivity Analysis
4.2 Fire quenching by water mist
4.3 Droplet per second (DPS)
4.4 Flame Extinction
4.5 Particle size and distribution
4.6 Fire quenching by Mixture
4.7 Fire suppression mechanism
4.7.1 Early Fire Suppression
4.7.2 Late Fire Suppression
4.8 Flow mechanism of Mixture
Chapter 5 Comparative analysis
5.1 Energy balance on gas phase
5.2 Radiative heat flux (RHF)
5.3 Thermal difference
5.4 Gas species
5.5 Computational cost
Chapter 6 Conclusions and prospect
6.1 Conclusions
6.2 Future work
List of References
Research Contributions
Articles
Conference Articles
Acknowledgement
本文編號:3338295
【文章來源】:中國科學(xué)技術(shù)大學(xué)安徽省 211工程院校 985工程院校
【文章頁數(shù)】:82 頁
【學(xué)位級別】:碩士
【文章目錄】:
摘要
ABSTRACT
Appendix
List of Abbreviations
Chapter 1 Introduction
1.1 Background
1.2 Research Objectives
1.3 Outline
Chapter 2 Computational Fluid Dynamics (CFD)
2.1 Fire Dynamics Simulator (FDS)
2.2 Particle distribution system
2.3 Mesh sensitivity
Chapter 3 Numerical Modeling of Pool Fire
3.1 Pool Fire
3.2 Classification of Pool Fire
3.3 Fire modelling
3.4 Fire suppressants
3.5 Initial conditions
3.6 Extinction Model
Chapter 4 Results and Discussion
4.1 Mesh Sensitivity Analysis
4.2 Fire quenching by water mist
4.3 Droplet per second (DPS)
4.4 Flame Extinction
4.5 Particle size and distribution
4.6 Fire quenching by Mixture
4.7 Fire suppression mechanism
4.7.1 Early Fire Suppression
4.7.2 Late Fire Suppression
4.8 Flow mechanism of Mixture
Chapter 5 Comparative analysis
5.1 Energy balance on gas phase
5.2 Radiative heat flux (RHF)
5.3 Thermal difference
5.4 Gas species
5.5 Computational cost
Chapter 6 Conclusions and prospect
6.1 Conclusions
6.2 Future work
List of References
Research Contributions
Articles
Conference Articles
Acknowledgement
本文編號:3338295
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