On the Characteristics of Fires in Tunnels

Anders Lönnermark

On the Characteristics of Fires in Tunnels

Anders Lönnermark

Avdelningen för Brandteknik

Forskningsoutput: Avhandling › Doktorsavhandling (sammanläggning)

2205 Nedladdningar (Pure)

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Popular Abstract in Swedish
I avhandlingen presenteras viktiga fenomen i samband med bränder i tunnlar. Detta baseras både på experimentellt och teoretiskt arbete. Tyngdpunkten ligger på de brandförsök i fullskala som genomfördes 2003 i Runehamartunneln i Norge. Under dessa försök mättes brandeffektutvecklingen (HRR), temperaturer, gaskoncentrationer (O2, CO2, CO, HCN och H2O), gashastigheter, strålning och rök. Försöksuppställningen simulerade långtradarlaster och fyra försök genomfördes med olika blandningar av cellulosa och plast. Mängden bränsle i respektive försök varierade mellan 2850 kg och 11010 kg, vilket gav maximal effektutveckling mellan 66 MW och 202 MW.

Resultaten från försöken visade att vanligt (ej definierat som farligt) gods kan ge brandeffekter och temperaturer, som hittills ansetts förknippade endast med farligt gods (t.ex. tankbilsbrand). Detta innebär att de högsta brandeffekterna och temperaturerna låg betydligt högre än vad som anges i olika riktlinjer och standarder. Ett nära samband identifierades mellan energiinnehåll och maximal brandeffekt för personbilar och långtradare. Det har också visats i Runehamarförsöken att en långtradarbrand kan sprida sig långa avstånd nedströms i tunnels, i storleksordningen 100 m. Baserat på resultaten från brandförsöken och verkliga bränder måste man understryka betydelsen av insatser under de första fem till tio minuterna av en brand i en tunnel. Åtgärder och handlande hos personer i tunneln under denna tidsperiod kan vara avgörande för utgången av branden.

Under två av brandförsöken i Runehamartunneln observerades stora pulsationer i gasflödet inne i tunneln. Dessa pulsationer registrerades endast när brandeffekten var högre än ungefär 125 - 135 MW. Två olika perioder mättes upp hos pulsationerna, en kortare på 4 s och en längre på 18 s. Pulsationerna presenteras och förklaras med hjälp av två olika angreppssätt: en akustisk analys och en frekvensresponsanalys baserad på impedanser. Dessa analyser visade att systemets resonansfrekvenser låg nära de uppmätta frekvenserna. Flera faktorer som kan påverka pulsationerna har identifierats, men beräkningarna visar att oscillationsperioderna är egenskaper hos systemet.

Andra fenomen som diskuteras är rök som transporteras uppströms (s.k. backlayering), ventilationens effekt på effektutvecklingen, flamlängder och förhållandena i tunneln. Data från litteraturen har, när det ansetts relevant, jämförts med resultaten från Runehamarförsöken. I denna analys har även toxicitet och ventilationens effekt på gassammansättningen inkluderats. Speciell uppmärksamhet gavs åt CO/CO2-kvoten och hur denna beror på ventilationen och förbränningsförhållandena. I detta sammanhang har resultat från en detaljerad studie av emissioner från rumsbränder och dess beroende av ventilationsförhållandena använts och legat till grund för en diskussion om ventilationens inverkan på toxiciteten och förhållandena i tunneln under en brand.

Originalspråk	engelska
Kvalifikation	Doktor
Tilldelande institution	Avdelningen för Brandteknik
Handledare	Holmstedt, Göran, handledare
Tilldelningsdatum	2005 okt. 21
Förlag	Department of Fire Safety Engineering and Systems Safety, Lund University
ISBN (tryckt)	91-628-6637-0
Status	Published - 2005

Bibliografisk information

Defence details

Date: 2005-10-21
Time: 10:15
Place: Room V:A, V-building, John Eriksson väg 1, Lund Institute of Technology

External reviewer(s)

Name: Beard, Alan N
Title: Dr
Affiliation: Heriot-Watt University, UK

---

<div class="article_info">A. Lönnermark. <span class="article_issue_date"></span>. <a href="javascript:downloadFile(545458)" class="article_link">Errata</a> (manuscript)</div>
<div class="article_info">A. Lönnermark and H. Ingason. <span class="article_issue_date">2005</span>. <span class="article_title">Gas Temperatures in Heavy Goods Vehicle Fires in Tunnels</span> <span class="journal_series_title">Fire Safety Journal</span>, <span class="journal_volume">vol 40</span> <span class="journal_pages">pp 506-527</span>.</div>
<div class="article_info">H. Ingason and A. Lönnermark. <span class="article_issue_date">2005</span>. <span class="article_title">Heat Release Rates from Heavy Goods Vehicle Trailer Fires in Tunnels</span> <span class="journal_series_title">Fire Safety Journal</span>, <span class="journal_volume">vol 40</span> <span class="journal_pages">pp 646-668</span>.</div>
<div class="article_info">P. Blomqvist and A. Lönnermark. <span class="article_issue_date">2001</span>. <span class="article_title">Characterization of the Combustion Products in Large-scale Fire Tests: Comparison of Three Experimental Configurations</span> <span class="journal_series_title">Fire and Materials</span>, <span class="journal_pages">pp 71-81</span>.</div>
<div class="article_info">A. Lönnermark and P. Blomqvist. <span class="article_issue_date">2005</span>. <span class="article_title">Emissions from an Automobile Fire</span> <span class="journal_series_title">Chemosphere</span>, (inpress)</div>
<div class="article_info">A. Lönnermark and H. Ingason. <span class="article_issue_date">2005</span>. <span class="article_title">Acoustic Considerations Regarding Pulsations during Large-Scale Fire Tests in a Tunnel</span> <span class="journal_series_title">Fire Safety Science - Proceedings of the Eighth International Symposium, Beijing, China, 18-23 September, 2005</span>, <span class="journal_distributor">Fire Safety Science - Proceedings of the Eighth International Symposium, Beijing, China, 18-23 September, 2005</span> (inpress)</div>
<div class="article_info">A. Lönnermark, B. Persson and H. Ingason. <span class="article_issue_date"></span>. <span class="article_title">Pulsations during Large-Scale Fire Tests in the Runehamar Tunnel</span> <span class="journal_series_title">Fire Safety Journal</span>, (submitted)</div>
<div class="article_info">A. Lönnermark and H. Ingason. <span class="article_issue_date">2005</span>. <span class="article_title">Fire Spread and Flame Length in Large- Scale Tunnel Fires</span> <span class="journal_series_title">Fire Technology</span>, (inpress)</div>

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@phdthesis{cab7c7b48099432c90d340f64d42bf52,

title = "On the Characteristics of Fires in Tunnels",

abstract = "Important phenomena related to tunnel fires are presented including both experimental and theoretical work. The main focus is on the large-scale fire tests performed in 2003, in the Runehamar tunnel in Norway. During these tests heat release rate (HRR), temperatures, gas concentrations (O2, CO2, CO, HCN, and H2O), velocities, radiation, and smoke were measured. Four tests with a set-up simulating HGV cargos were performed with fuel loads constituting of different mixtures of cellulose and plastic. The fuel load ranged from 2850 kg to 11010 kg giving maximum HRRs between 66 MW and 202 MW. The results showed that ordinary (non-hazardous) cargo can give HRRs and temperatures normally expected to be related only to hazardous goods (e.g. tanker fires). Thus, the highest HRR and gas temperature were far higher than that suggested by most tunnel design guidelines. A close correlation between the maximum HRR and energy content is presented for passenger cars and HGVs. It has also been shown in the Runehamar tests that the fire in an HGV can spread a long distance downstream in a tunnel, of the order of 100 m. Based on the test results and real incidents one must emphasize the importance of the incident operation during the first five to ten minutes of the fire. The actions of the people inside the tunnel and the rescue personnel during this time period can be crucial to the outcome. During two of the fire tests, large pulsations of the gas flow inside the tunnel were observed. These pulsations were registered only when the measured heat release rate was higher than 125 MW - 135 MW. Two different periods of pulsations were registered, short periods of approximately 4 s and longer periods of approximately 18 s. The pulsations are presented and explanations are given, using two different approaches: an acoustic approach and a frequency response analysis based on an impedance approach. The intrinsic resonances of the system proved to be close to the periods found in the experiments. Several factors can affect the pulsations, but the calculations show that the oscillation periods are properties of the system. Other issues discussed include backlayering and the effect of the ventilation on the HRR, flame length, and the conditions in the tunnel. Literature data are, where relevant, compared with the results from the Runehamar tests. In this analysis toxicity and the effect of the ventilation conditions on the gas composition in the tunnel are also included. Special attention was paid to the CO/CO2 ratio and its dependence on the ventilation and combustion conditions. In this context results from a detailed study of the emissions from an enclosure fire under varied ventilation conditions are used as the basis for a discussion of the impact of ventilation on the acute toxicity of the fire gases.",

keywords = "experiments, tunnel fire, heat release rate, temperature, fire spread, ventilation, backlayering, pulsations, thermoacoustic instability, equivalence ratio, emissions, gas concentrations, toxicity, Technological sciences, Teknik, Building construction, Byggnadsteknik, Road transport technology, V{\"a}gtransportteknik, Railway transport technology, J{\"a}rnv{\"a}gstransportteknik",

author = "Anders L{\"o}nnermark",

note = "Defence details Date: 2005-10-21 Time: 10:15 Place: Room V:A, V-building, John Eriksson v{\"a}g 1, Lund Institute of Technology External reviewer(s) Name: Beard, Alan N Title: Dr Affiliation: Heriot-Watt University, UK --- <div class={"}article\_info{"}>A. L{\"o}nnermark. <span class={"}article\_issue\_date{"}></span>. <a href={"}javascript:downloadFile(545458){"} class={"}article\_link{"}>Errata</a> (manuscript)</div> <div class={"}article\_info{"}>A. L{\"o}nnermark and H. Ingason. <span class={"}article\_issue\_date{"}>2005</span>. <span class={"}article\_title{"}>Gas Temperatures in Heavy Goods Vehicle Fires in Tunnels</span> <span class={"}journal\_series\_title{"}>Fire Safety Journal</span>, <span class={"}journal\_volume{"}>vol 40</span> <span class={"}journal\_pages{"}>pp 506-527</span>.</div> <div class={"}article\_info{"}>H. Ingason and A. L{\"o}nnermark. <span class={"}article\_issue\_date{"}>2005</span>. <span class={"}article\_title{"}>Heat Release Rates from Heavy Goods Vehicle Trailer Fires in Tunnels</span> <span class={"}journal\_series\_title{"}>Fire Safety Journal</span>, <span class={"}journal\_volume{"}>vol 40</span> <span class={"}journal\_pages{"}>pp 646-668</span>.</div> <div class={"}article\_info{"}>P. Blomqvist and A. L{\"o}nnermark. <span class={"}article\_issue\_date{"}>2001</span>. <span class={"}article\_title{"}>Characterization of the Combustion Products in Large-scale Fire Tests: Comparison of Three Experimental Configurations</span> <span class={"}journal\_series\_title{"}>Fire and Materials</span>, <span class={"}journal\_pages{"}>pp 71-81</span>.</div> <div class={"}article\_info{"}>A. L{\"o}nnermark and P. Blomqvist. <span class={"}article\_issue\_date{"}>2005</span>. <span class={"}article\_title{"}>Emissions from an Automobile Fire</span> <span class={"}journal\_series\_title{"}>Chemosphere</span>, (inpress)</div> <div class={"}article\_info{"}>A. L{\"o}nnermark and H. Ingason. <span class={"}article\_issue\_date{"}>2005</span>. <span class={"}article\_title{"}>Acoustic Considerations Regarding Pulsations during Large-Scale Fire Tests in a Tunnel</span> <span class={"}journal\_series\_title{"}>Fire Safety Science - Proceedings of the Eighth International Symposium, Beijing, China, 18-23 September, 2005</span>, <span class={"}journal\_distributor{"}>Fire Safety Science - Proceedings of the Eighth International Symposium, Beijing, China, 18-23 September, 2005</span> (inpress)</div> <div class={"}article\_info{"}>A. L{\"o}nnermark, B. Persson and H. Ingason. <span class={"}article\_issue\_date{"}></span>. <span class={"}article\_title{"}>Pulsations during Large-Scale Fire Tests in the Runehamar Tunnel</span> <span class={"}journal\_series\_title{"}>Fire Safety Journal</span>, (submitted)</div> <div class={"}article\_info{"}>A. L{\"o}nnermark and H. Ingason. <span class={"}article\_issue\_date{"}>2005</span>. <span class={"}article\_title{"}>Fire Spread and Flame Length in Large- Scale Tunnel Fires</span> <span class={"}journal\_series\_title{"}>Fire Technology</span>, (inpress)</div>",

year = "2005",

language = "English",

isbn = "91-628-6637-0",

publisher = "Department of Fire Safety Engineering and Systems Safety, Lund University",

type = "Doctoral Thesis (compilation)",

school = "Division of Fire Safety Engineering",

}

TY - THES

T1 - On the Characteristics of Fires in Tunnels

AU - Lönnermark, Anders

N1 - Defence details Date: 2005-10-21 Time: 10:15 Place: Room V:A, V-building, John Eriksson väg 1, Lund Institute of Technology External reviewer(s) Name: Beard, Alan N Title: Dr Affiliation: Heriot-Watt University, UK --- <div class="article_info">A. Lönnermark. <span class="article_issue_date"></span>. <a href="javascript:downloadFile(545458)" class="article_link">Errata</a> (manuscript)</div> <div class="article_info">A. Lönnermark and H. Ingason. <span class="article_issue_date">2005</span>. <span class="article_title">Gas Temperatures in Heavy Goods Vehicle Fires in Tunnels</span> <span class="journal_series_title">Fire Safety Journal</span>, <span class="journal_volume">vol 40</span> <span class="journal_pages">pp 506-527</span>.</div> <div class="article_info">H. Ingason and A. Lönnermark. <span class="article_issue_date">2005</span>. <span class="article_title">Heat Release Rates from Heavy Goods Vehicle Trailer Fires in Tunnels</span> <span class="journal_series_title">Fire Safety Journal</span>, <span class="journal_volume">vol 40</span> <span class="journal_pages">pp 646-668</span>.</div> <div class="article_info">P. Blomqvist and A. Lönnermark. <span class="article_issue_date">2001</span>. <span class="article_title">Characterization of the Combustion Products in Large-scale Fire Tests: Comparison of Three Experimental Configurations</span> <span class="journal_series_title">Fire and Materials</span>, <span class="journal_pages">pp 71-81</span>.</div> <div class="article_info">A. Lönnermark and P. Blomqvist. <span class="article_issue_date">2005</span>. <span class="article_title">Emissions from an Automobile Fire</span> <span class="journal_series_title">Chemosphere</span>, (inpress)</div> <div class="article_info">A. Lönnermark and H. Ingason. <span class="article_issue_date">2005</span>. <span class="article_title">Acoustic Considerations Regarding Pulsations during Large-Scale Fire Tests in a Tunnel</span> <span class="journal_series_title">Fire Safety Science - Proceedings of the Eighth International Symposium, Beijing, China, 18-23 September, 2005</span>, <span class="journal_distributor">Fire Safety Science - Proceedings of the Eighth International Symposium, Beijing, China, 18-23 September, 2005</span> (inpress)</div> <div class="article_info">A. Lönnermark, B. Persson and H. Ingason. <span class="article_issue_date"></span>. <span class="article_title">Pulsations during Large-Scale Fire Tests in the Runehamar Tunnel</span> <span class="journal_series_title">Fire Safety Journal</span>, (submitted)</div> <div class="article_info">A. Lönnermark and H. Ingason. <span class="article_issue_date">2005</span>. <span class="article_title">Fire Spread and Flame Length in Large- Scale Tunnel Fires</span> <span class="journal_series_title">Fire Technology</span>, (inpress)</div>

PY - 2005

Y1 - 2005

N2 - Important phenomena related to tunnel fires are presented including both experimental and theoretical work. The main focus is on the large-scale fire tests performed in 2003, in the Runehamar tunnel in Norway. During these tests heat release rate (HRR), temperatures, gas concentrations (O2, CO2, CO, HCN, and H2O), velocities, radiation, and smoke were measured. Four tests with a set-up simulating HGV cargos were performed with fuel loads constituting of different mixtures of cellulose and plastic. The fuel load ranged from 2850 kg to 11010 kg giving maximum HRRs between 66 MW and 202 MW. The results showed that ordinary (non-hazardous) cargo can give HRRs and temperatures normally expected to be related only to hazardous goods (e.g. tanker fires). Thus, the highest HRR and gas temperature were far higher than that suggested by most tunnel design guidelines. A close correlation between the maximum HRR and energy content is presented for passenger cars and HGVs. It has also been shown in the Runehamar tests that the fire in an HGV can spread a long distance downstream in a tunnel, of the order of 100 m. Based on the test results and real incidents one must emphasize the importance of the incident operation during the first five to ten minutes of the fire. The actions of the people inside the tunnel and the rescue personnel during this time period can be crucial to the outcome. During two of the fire tests, large pulsations of the gas flow inside the tunnel were observed. These pulsations were registered only when the measured heat release rate was higher than 125 MW - 135 MW. Two different periods of pulsations were registered, short periods of approximately 4 s and longer periods of approximately 18 s. The pulsations are presented and explanations are given, using two different approaches: an acoustic approach and a frequency response analysis based on an impedance approach. The intrinsic resonances of the system proved to be close to the periods found in the experiments. Several factors can affect the pulsations, but the calculations show that the oscillation periods are properties of the system. Other issues discussed include backlayering and the effect of the ventilation on the HRR, flame length, and the conditions in the tunnel. Literature data are, where relevant, compared with the results from the Runehamar tests. In this analysis toxicity and the effect of the ventilation conditions on the gas composition in the tunnel are also included. Special attention was paid to the CO/CO2 ratio and its dependence on the ventilation and combustion conditions. In this context results from a detailed study of the emissions from an enclosure fire under varied ventilation conditions are used as the basis for a discussion of the impact of ventilation on the acute toxicity of the fire gases.

AB - Important phenomena related to tunnel fires are presented including both experimental and theoretical work. The main focus is on the large-scale fire tests performed in 2003, in the Runehamar tunnel in Norway. During these tests heat release rate (HRR), temperatures, gas concentrations (O2, CO2, CO, HCN, and H2O), velocities, radiation, and smoke were measured. Four tests with a set-up simulating HGV cargos were performed with fuel loads constituting of different mixtures of cellulose and plastic. The fuel load ranged from 2850 kg to 11010 kg giving maximum HRRs between 66 MW and 202 MW. The results showed that ordinary (non-hazardous) cargo can give HRRs and temperatures normally expected to be related only to hazardous goods (e.g. tanker fires). Thus, the highest HRR and gas temperature were far higher than that suggested by most tunnel design guidelines. A close correlation between the maximum HRR and energy content is presented for passenger cars and HGVs. It has also been shown in the Runehamar tests that the fire in an HGV can spread a long distance downstream in a tunnel, of the order of 100 m. Based on the test results and real incidents one must emphasize the importance of the incident operation during the first five to ten minutes of the fire. The actions of the people inside the tunnel and the rescue personnel during this time period can be crucial to the outcome. During two of the fire tests, large pulsations of the gas flow inside the tunnel were observed. These pulsations were registered only when the measured heat release rate was higher than 125 MW - 135 MW. Two different periods of pulsations were registered, short periods of approximately 4 s and longer periods of approximately 18 s. The pulsations are presented and explanations are given, using two different approaches: an acoustic approach and a frequency response analysis based on an impedance approach. The intrinsic resonances of the system proved to be close to the periods found in the experiments. Several factors can affect the pulsations, but the calculations show that the oscillation periods are properties of the system. Other issues discussed include backlayering and the effect of the ventilation on the HRR, flame length, and the conditions in the tunnel. Literature data are, where relevant, compared with the results from the Runehamar tests. In this analysis toxicity and the effect of the ventilation conditions on the gas composition in the tunnel are also included. Special attention was paid to the CO/CO2 ratio and its dependence on the ventilation and combustion conditions. In this context results from a detailed study of the emissions from an enclosure fire under varied ventilation conditions are used as the basis for a discussion of the impact of ventilation on the acute toxicity of the fire gases.

KW - experiments

KW - tunnel fire

KW - heat release rate

KW - temperature

KW - fire spread

KW - ventilation

KW - backlayering

KW - pulsations

KW - thermoacoustic instability

KW - equivalence ratio

KW - emissions

KW - gas concentrations

KW - toxicity

KW - Technological sciences

KW - Teknik

KW - Building construction

KW - Byggnadsteknik

KW - Road transport technology

KW - Vägtransportteknik

KW - Railway transport technology

KW - Järnvägstransportteknik

M3 - Doctoral Thesis (compilation)

SN - 91-628-6637-0

PB - Department of Fire Safety Engineering and Systems Safety, Lund University

ER -

On the Characteristics of Fires in Tunnels

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