Investigation of variation in cylinder parameters in a spark ignition natural gas engine with natural gas-hydrogen blends

Abstract

Paper presented at the 7th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Turkey, 19-21 July, 2010.This study presents the numerical simulations of combustion of methane-hydrogen blends (100%CH4, 10% H2 - 90%CH4, 20%H2 - 80%CH4 and 30%H2 - 70%CH4) through a cylinder. The numerical calculations were performed using the finite volume CFD code FLUENT with the standart k-ɛ model, for which the compression ratio and the nominal speed are 10 and 2000 rpm, respectively. Excessive air ratios were selected as 0.8, 1.0, 1.2 and 1.4. The spark timings were started 30° BTDC. The results of the combustion process were investigated as a function of crank angle. Calculated cylinder pressure data was compared with experimental for the verification of the combustion model, this investigate reveals that the combustion model used shows encouraging results. The maximum cylinder pressures and temperatures were obtained as a consequence of rich mixture. When the excessive air ratio increased, peak pressure values are decreased.