ABSTRACT In this paper, computational simulation on the effect of combustion temperature on emissions characteristics of hydrogen-fuelled compression ignition engine was performed. Combustion process was modeled based on Equilibrium Constant Method (ECM) and programmed using MATLAB program in order to calculate mole fractions of 18 combustion products when hydrogendiesel fuels blends is burnt at variable combustion temperatures. It is observed that throughout all equivalence ratios, higher temperature increases H 2 , CO , HCN, atoms C, O and H, NO, OH, NO 2 and O 3 emissions and decreases CO 2 , H 2 O, NH3 and CH 4 , N 2 , O 2 and HNO 3 emissions. The highest H 2 O emission occurs during stoichiometric combustion and decrease in combustion temperature causes insignificant changes in atom N emission
