Hydrogren risk assessment in PWR nuclear power plants or in laboratories and factories following a hydrogen leak was the subject of many studies, mainly on the various phenomena controlling the hydrogen combustion. Limitations appear in the understanding of acceleration and deceleration of flame to assess the rise of pressure in the building.

The aim of this work is to establish an experimental database (i) on initial acceleration phase and (ii) on the modification of flame propagation speed under a controlled homogenous and isotropic turbulence. A correlation able to predict the flame speed as a function of parameters characteristics of combustion and turbulent flow field has been proposed. For this purpose a new spherical vessel has been built and validated to study flame propagation. In this vessel high radius flame can be observed under a controlled homogenous and isotropic turbulence.