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Engine researchers continually look for ways to reduce emissions such as NOx, CO, and CO2, in order to meet emissions regulations. NOx formation is primarily a function of temperature, with higher temperatures producing more NOx. Because of this, there is a desire to lower combustion temperatures while maintaining complete combustion. Blending hydrogen into an engine’s fuel can lower combustion temperatures and reduce emissions. This is due to how hydrogen acts as a fuel. It has a wide range of flammability in comparison with all other fuels, which allows for leaner engine operation and lower combustion temperatures. Hydrogen has a very high molecular diffusivity, which creates a more uniform mixture of fuel and air. Hydrogen also has very low ignition energy, which translates into easier combustion. For our research, a large bore, two stroke, single cylinder, natural gas fueled Ajax engine was used. The engine was brought up to the test point on pure natural gas and allowed to stabilize. Then, the blended fuel, a mixture of hydrogen and natural gas at different molar percentages, was introduced into the engine. Five percent hydrogen was tried first, and the percentage was increased by five percent until 30 percent was reached, as reported in many publications. Engine and emissions data were recorded while the engine operated on pure natural gas and each percentage of hydrogen. Physical observations were also noted, such as engine misfires. It was found that the addition of hydrogen did reduce emissions. The engine ran smoother and the speed increased while keeping the torque constant. This shows that the combustion was easier to initiate, as expected. There were no noticeable increase in misfires or engine knock as the hydrogen was added. Overall, it was found that hydrogen addition had a positive effect on the engine, and would be a good method of meeting emissions requirements. This paper reports the results of this study by quantifying emission reduction and eng
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