Assessment Of Fire Suppression Capabilities Of Water Mist -Fighting Compartment Fires with the Cutting Extinguisher- FIREFIGHT II Mid-term Meeting Wednesday 24 – Friday 26 November 2010 in Prague Pg. Dip. Msc. Fire Safety Engineering Academic year 2009/2010 Julien GSELL juliengsell@orange. fr
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Assessment Of Fire Suppression Capabilities Of Water Mist
Pg. Dip. Msc . Fire Safety Engineering Academic year 2009/2010. Assessment Of Fire Suppression Capabilities Of Water Mist. -Fighting Compartment Fires with the Cutting Extinguisher- FIREFIGHT II Mid-term Meeting Wednesday 24 – Friday 26 November 2010 in Prague. Julien GSELL - PowerPoint PPT Presentation
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Assessment Of Fire Suppression Capabilities Of Water Mist
-Fighting Compartment Fires with the Cutting Extinguisher-
FIREFIGHT II Mid-term MeetingWednesday 24 – Friday 26 November 2010 in Prague
Pg. Dip. Msc. Fire Safety EngineeringAcademic year 2009/2010
• 99 TC distributed over 8.8 m length,2.4 m width and 2.4 m height
• Control volume of 0.512 m3
– Radiometer– Pressure record
• 2 transducers– Video record
Temperature, pressure & heat flux
• Instrumentation– Bottle frame– Thermocouple meshing– Radiometer– Pressure record– Video record
Experimental framework
Video record
Methodology
• Scenarios– Location of the Cutting Extinguisher
• Front wall, mid-length, 1.65 m high– Studied parameter
• Experimental protocol– Exploit of the “Bottle frame”– Full scale burnings
Location of the Cutting Extinguisher
Methodology
• Scenarios– Location of the Cutting Extinguisher– Studied parameters
• Volumetric distribution of water• Influence of opening area, fuel surface, and
water flow rate• Experimental protocol
– Exploit of the “Bottle frame”– Full scale burnings
Studied parameters• Fire experiments
Designation of the scenario
Area of the openingsBurning SurfaceWater flow ratePossibles fire scenarios
Fire scenarios
Q = 56 L/min
Sf = 12.8 m2
Ac = 0.192 m2 1Ac = 0.192 m2 2Ao= 2.71 m2 3
Sr = 8.4 m2
Ac = 0.192 m2 4Ao= 2.71 m2 5
Qr = 28 L/min
Sf = 12.8 m2
Ac = 0.192 m2 6Ao= 2.71 m2 7
Sr = 8.4 m2
Ac = 0.192 m2 8
Ao= 2.71 m2 9
Methodology
• Scenarios– Location of the Cutting Extinguisher– Studied parameters
• Experimental protocol– Exploit of the “Bottle frame”– Full scale burnings
Exploit of the bottle frame
Methodology
• Scenarios– Location of the Cutting Extinguisher– Studied parameters
• Experimental protocol– Exploit of the “Bottle frame”– Full scale burnings
Full scale burnings
Results
• Water mist behaviour– Total flooding
• Water content: 44 g/m3
• Volumetric flow rate: 21.2 m3/s• Velocity: 7.13 m/s
– Spray pattern
Total flooding
Total flooding
Results
• Water mist behaviour– Total flooding– Spray pattern
• Inner core + outer ring• Initial diameter: 4.5 °• Break up point at 5.0 m• Widening following an angle of 9.0 °
– Application modes
Spray pattern
Results
• Water mist behaviour– Total flooding– Spray pattern– Application modes
• Spread droplets into the flames• Spread droplets in the smoke layer• Inerting by steam generation• Cool the burning fuel surface• Shield the fuel surfaces not yet involved
Results
• Fire suppression capabilities– Flame tackling time
• Fire extinguished every time• Below 15 seconds regardless to the scenarios• Major effect trough blowing and heat extraction
– Influence of parameters during gas cooling phase