Numerical Analysis of Ignition Assisted by Glow Plug in Ammonia-Hydrogen Mixed Fuel
Glow plug-assisted compression ignition,as an advanced engine strategy,promotes the application of low cetane number fuels in compression ignition engines.This paper numerically analyzes the impact of the glow plug on the ignition of ammonia-hydrogen mixed fuel based on CONVERGE simulation software.By constructing a three-dimensional constant volume combustion chamber model,the influence mechanisms of different ambient temperatures,glow plug hot surface temperatures,and glow plug installation positions on the ignition of ammonia-hydrogen mixed fuel injections are discussed in detail.Simulation results show that the installation of a glow plug helps to broaden the flammability limits of ammonia-hydrogen mixed fuel.As the hot surface temperature of the glow plug increases,the formation of initial ignition points in the combustion chamber is enhanced,the ignition delay time is shortened,the proportion of diffusion combustion increases,and the heat release rate decreases.The farther the glow plug is positioned from the injector,the later the formation of the initial ignition point,resulting in a longer ignition delay time but a higher heat release rate.A glow plug located at the bottom stays in contact with high-concentration fuel for a longer time,thereby enhancing the subsequent combustion rate.
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