ENACCEF-I is constituted of 2 sections: the upper part is a 654 l vessel, named the dome, and it is connected to a vertical tube of approximately 65 l, referred to as the acceleration tube, in which different shapes of obstacles can be positioned. This facility is highly instrumented with 16 photomultipliers tubes for flame detection and 9 pressure sensors to measure the maximum pressure load. The dome and the acceleration tube are equipped with 3 optical windows each to allow laser diagnostics implementation. Spark ignition can be positioned at different height allowing the study of different flame propagation (upward and downward). Different type of sprays can be implemented in the facility. Homogeneous mixtures or gradient of concentration can be obtained.

Dimensions :

  • Acceleration tube: 3.2m long, 154mm of i.d.
  • Dome: 1.7m long, 738mm of i.d.

Pressure / Temperature

  • 45 bar / 25°C

This facility was commissioned in 2001 for various studies dealing with the characterization of combustion regimes of hydrogen-based mixtures in a closed, obstacle-clogged volume. Thus the propensity of the flame to accelerate strongly is analyzed for different conditions:

  • uniformly distributed mixtures or in the presence of a concentration gradient
  • inert gas impact
  • efficiency of the means of combustion mitigation: water sprinkling, inerting.


Related publications
– N. Chaumeix, H. Cheikhravat, A. Bentaib, A.Bleyer (2017). On the Applicability of the Sigma Criterion to Non-Homogeneous H2 Concentration Configurations, 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Sept. 3-8, 2017, Xi’an, Shaanxi, China
– R. Grosseuvres, N. Chaumeix, A. Bentaib (2017). Pressure Profiles Measurements in ENACCEF Facility for Fast Flame Propagation, 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Sept. 3-8, 2017, Xi’an, Shaanxi, China
– N. Chaumeix (2016), “Fundamental Studies Towards Better Assessment of Hydrogen Explosions” 8th International Seminar on Fire and Explosion Hazards (ISFEH), April 2016
– A. Bentaib, A. Bleyer, N. Meynet, N. Chaumeix, B. Schramm, M. Höhne, P. Kostka, M. Movahed, S. Worapittayaporn. Brähler, H. Seok-Kang, M. Povilaitis, I. Kljenak, P. Sathiah, (2014). “SARNET Hydrogen deflagration Benchmarks: Main outcomes and conclusions”, Annals of Nuclear Energy 74, 143-152,
– A. Bleyer, J. Taveau, N. Djebaïli-Chaumeix, C.E. Paillard, A. Bentaïb (2012). “Comparison between FLACS explosion simulations and experiments conducted in a PWR Steam Generator casemate scale down with hydrogen gradients”, Nuclear Engineering and Design, Volume 245 (0), pp. 189-196,