Abstract
Due to the complexity of modeling the combustion process in nuclear power station, the global mechanisms are preferred for numerical simulation. To quickly perform the highly-resolved simulations with limited processing resources of large-scale hydrogen combustion, a method based on thermal theory was developed to obtain kinetic parameters of global reaction mechanism of hydrogen-air combustion in a wide range. The calculated kinetic parameters at lower hydrogen concentration (Chydrogen 20%) was compared with the results by detailed mechanism. Good agreement between the model prediction and the experimental data was achieved, and the comparison between simulation results by the detailed mechanism and the global reaction mechanism show that the present calculated global mechanism has excellent predictable capabilities for a wide range of hydrogen-air mixtures.
Highlights
Nuclear power as a clean and sustainable energy has ignited the interests of the researchers worldwide (Momirlan and Veziroglu, 2005)
Significant safety issues associated with hydrogen occur in pressurized water reactors and boiling water reactors of nuclear power plants (Yanez et al, 2015)
Due to shorter time period and lower cost, numerical simulation appears to be an appropriate tool to assess the hydrogen risk, which emphasizes the importance of chemical reactions to combustion (Kuo, 2005)
Summary
Nuclear power as a clean and sustainable energy has ignited the interests of the researchers worldwide (Momirlan and Veziroglu, 2005). Global Reaction Model for Hydrogen Combustion quasi-steady-state assumptions, and directed relation graph. Those methods require strong mechanism-dependent knowledge and are generally time-consuming due to the iterative procedure and validation process for eliminating species (Lu and Law, 2005). Bane et al (2010) calculated overall reaction order, activation energy, and pre-exponential factor of hydrogen/air single-step model by constant-pressure and volume explosion model. With the aim to simulate large-scale hydrogen combustion and explosion, Wang et al (2012) established single step and transport models for fuel–air mixture. The activation energy can be obtained by fitting experimental velocities at adiabatic flame temperature These expressions are not suitable for homogeneous (gas phase) reactions. The model at higher hydrogen concentration (Chydrogen > 20%) was compared with the results simulated by detailed mechanism
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