ENACCEF 2 facility is a vertical tube, 7.65 m high and 230 mm i.d., equipped with 27 optical ports to detect the flame passage along the tube and 12 large windows at specific locations along the tube to record the flame structure using high speed imaging techniques. These large windows allow the use of high speed particle image velocimetry to measure the velocity field ahead of the flame induced by the latter. Ten high frequency pressure sensors distributed along the tube allow the monitoring of the pressure build-up inside the facility and the characterization of the pressure loads. 27 shock detectors measure precisely the shock waves location and hence a trajectory can be derived. The ignition can be located at any position in the tube so that several flame propagation can be studied. A gradient of either composition or temperature can be easily created. Different sprays configurations can be implemented in the facility to study water spray effect on the combustion dynamics.
Operations at this facility began in 2016 for various research projects such as Flame acceleration, Deflagration-to-Detonation Transition, Water sprays effect, gradient of H2, sigma criterion, Combustion and Flame Dynamics.
– R. Grosseuvres, A. Bentaïb, N. Chaumeix (2019). Effect of Initial Temperature and Temperature Gradient on H2/Air Flame Propagation in Confined Area. 27 International Colloquium on the Dynamics of Explosions and Reactive Systems, July 28 –August 2, Beijing, China