Modeling pressure loads during a premixed hydrogen combustion in the presence of water spray

Abstract

This paper describes the development of a simplified model for pressure evolution inside a closed volume during a combustion process in presence of a water spray. The model is based on empirical correlations available in the literature. These ingredients allow us to estimate the values for the main factors influencing the pressure evolution. The results of this model are used as a guideline for adjusting the parameters of a three-dimensional hydrodynamic code based on CREBCOM combustion model, developed and validated for large-scale hydrogen combustion. The methodology is successfully assessed by comparing the computed results with the experimental data of Carlson et al. [1].

Modeling of particle cloud dispersion in compressible gas flows with shock waves

“…Substituting Eqs. ( 6) and ( 16) into (18) and according to the definition of Δt and τp, one can deduce…”

“…In this case, the shock-spray interaction can change dramatically the dispersion of droplets, leading to the change in the mitigation capacity of the spray system. [17][18][19] On the contrary, the particle cloud can also affect the propagation of the shock wave. 20 Basically, as a result of the high velocity of the shocked gas, the shock-droplet interaction can generate complex coupled phenomena such as droplet deformation, atomization, collision, coalescence, and evaporation.…”

A new formulation of a spray dispersion model for particle/droplet-laden flows subjected to shock waves

“…The role of atomization processes is thus to increase the transfer surface (Yeom & Chang 2012) and to intensify the heat (evaporation) as well as the mass transfer. These transfer processes largely affect the thermal equilibrium conditions of the post-shock gas (Kersey, Loth & Lankford 2010) and may change the topology of the cloud dispersion, leading to shock-wave mitigation and/or a flame extinction in the case of reacting flows (Thomas 2000;Gai et al 2019).…”

“…These transfer processes largely affect the thermal equilibrium conditions of the post-shock gas (Kersey, Loth & Lankford 2010) and may change the topology of the cloud dispersion, leading to shock-wave mitigation and/or a flame extinction in the case of reacting flows (Thomas 2000; Gai et al. 2019).…”