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SBEP 2007

During meeting 5-6 February 2008 in Bergen partners agreed to fix the dates for submission results of simulations for the program SBEP 2007.

List of actions, reminders, agreements for exercises V10 - V15:

• V10
  • Status: Finalize
  • Lead: DNV
  • Partners submitted results or participating: DNV, NCSRD, UU, GexCon, UPM, HSL
  • List of actions, etc:
    • to exclude uncertainties in mass flow rate partners agreed to use ‘Discharge Coeff.’ equal to 0.9 (it corresponds to 40 g/s)
• V11
  • Status: Continue
  • Lead: GexCon
  • Deadline for submission of the new results: --
  • Partners submitted results or participating: NCSRD, GexCon, UPM
  • List of actions, etc (partners agreed that the priority task is to find key parameter(s) responsible for worst case)
    • make comparison Q8, Q9, σ-criteria, λ-criteria
    • make proposals for worst case ignition location and time
    • make proposals on other parameters influencing worst case as turbulence level, geometry configuration, etc
• V12
  • Status: Finalize
  • Lead: JRC
  • Deadline for submission of the new results: 1 Aug., Paper first draft 1 Sept, Paper final 15 Oct
  • Partners submitted results or participating: UU, FZK, GexCon, JRC, KI
  • List of actions, etc:
    • None
• V13
  • Status: Continue
  • Lead: KI(?), FZK(?)
  • Deadline for submission of the new results: --
  • Partners submitted results or participating: FZK, JRC, GexCon, KI
  • List of actions, etc:
    • None
• V14
  • Status: Continue
  • Lead: JRC
  • Deadline for submission of the new results: 1 Sept
  • Partners submitted results or participating: UU, FZK, JRC, WUT, GexCon
  • List of actions, etc:
    • WUT will perform tests to confirm value of Pmax in closed vessel (if possible)
    • WUT will provide help to digitize plots and to make 0-dimensional evaluations of pressure growth (code VEX)
    • UU will contact with Pasman to obtain missing or additional information: more tests, other concentrations, openings, sizes, ignition
• V15
  • Status: Continue
  • Lead: GexCon
  • Deadline for submission of the new results: Open
  • Partners submitted results or participating: JRC, GexCon
  • List of actions, etc:
    • FZK will provide with data from planned tests for flat layer (if possible)
    • partners agreed to try to perform parametric study on ignition location

SBEP(s) for years 2007 - 2008:

SBEP on hydrogen release and mixing

• V10 HSL jet tests ( data will be provided by HSL)
• V11 QRA-connected exercise (proposal prepared by GexCon)

SBEP on hydrogen fires or explosions

• V12 Tunnel (Groethe, et al.)
• V13 Detonation: both KI tests hyd5 and hyd9
• V14 Explosion with vent: INERIS (or Pasman et al)
• V15 QRA-connected exercise (proposal prepared by GexCon)

Information of availability

^* D81, UU revised data and WUT Hydrogen-air explosion data

^** Proposals for SBEP V11 and V15

^*** Experimental data and description for RUT-2200 facility

V12

from e-mail of Dmitriy Makarov and Franck Verbecke

Please find updated information on SBEP V12 (30% H2 explosion in 1/5 tunnel with/without obstacles) attached to this mail (V12 experimental data). Find attached also 2 published papers on the experiment in question:

1. Groethe M., Merilo E., Colton J. et al., “Large-scale Hydrogen deflagrations and detonations”, International Conference on Hydrogen Safety, Pisa, Italy, 8-10 September 2005. ISBN 88-8492-314-X

2. Sato Y., Merilo E., Groethe M. et al., “Homogeneous hydrogen deflagrations in a sub-scale vehicle tunnel”, 17th Annual Conference & Hydrogen Expo US, 12-17 March 2006, Long Beach, CA, USA.

The tunnel geometry (cross section, length, size of car's mock-up models) are clear from the papers. NHA conference paper reports that pressure transducers were installed on side of the tunnel surface.

There is contradictory information on the position of cars in case of obstructed tunnel explosion and the distance between mock-up cars in these papers. Last week Franck Verbecke contacted experimentalists and they confirmed that CARS ARE INSTALLED WITHIN HYDROGEN-AIR MIXTURE ONLY - 4 cars altogether (see Figure 3 in NHA paper), the rest of the tunnel is empty. The distance between cars is 1.6 of car's length (1520 mm). Air temperature for experiment without obstacles was +13.4C, with obstacles +9.1C.

Second of the attached papers has pressure dynamics for both experiments (with and without obstacles) at 1.0, 3.6, 10.6 and 30.4 m from the tunnel centre. Please find attached Excel table with digitized pressure dynamics.

Deadline for all cases 31.12.2007.

Meetings for the discussion of the results of simulations

First 2007 SBEP meeting: 11 Oct. 2007 combined with HyQRA meeting, after CC15 in Buxton
Second 2007 SBEP meeting: 27 -28 Nov 2007 in Madrid
Fthird 2007 SBEP meeting: 5 - 6 February 2008 in Bergen

Status of SBEP 2006

• V8 (Kotchourko) by now only participated: GexCon, JRC, FZK. ToDo:
  • request for more input
• V4 (Ledin) ToDo:
  • clarify H2 concentration measurements;
  • define time schedule during next meeting (Feb. 2008)
• V7 (Makarov) Time schedule for ToDo:
  • post-simulations 1 Feb. 2008;
  • paper draft 15 Feb;
  • paper final 1 March;
  • paper submission 15 March 2008