doi:10.3850/978-981-08-7724-8_07-02

ABSTRACT

The main objective of this work is to study the effect of storage pressure on the spontaneous ignition of hydrogen at a sudden release from a high pressure vessel, and its transient combustion. The paper describes the modelling and large eddy simulation (LES) of the spontaneous ignition dynamics emerging from a tube into a semi-confined space. The comparison between 147 and 700 bar storage pressures is given in terms of flow velocity, temperature and hydrogen and hydroxyl mole fractions. It is demonstrated that, while for the lower pressure the combusting cocoon is broken, for the higher pressure it remains intact. The difference in process dynamics is attributed to the wider high temperature area by the time the mixture reaches the end of the tube.

Keywords: Hydrogen, High-pressure release, Spontaneous ignition, Large-eddy simulation, Transient combustion.

© 2011 CPD Unit, University of Leeds