Abstract
Abstract Considering hydrogen as a clean alternative fuel for engines, this paper is to develop a procedure to add hydrogen in an intake manifold and to design an exhaust gas recirculation ( EGR ) system for a direct injection diesel engine. The cylinder gas pressure, air mass flow, fuel mass flow, and emissions (such as CO, CO 2 , HC, NO X , and smoke) were measured under various engine loads and 0%–40% EGR ratios adjusting the hydrogen-energy-share ratio at 0%–20%, meaning that the energy of hydrogen replaced 0%–20% that of diesel fuel. The combustion characteristics such as cyclic variations, heat release rate, brake thermal efficiency, and specific fuel consumption ( SFC ) were determined. The results show that the variation coefficient values of indicated mean effective pressure ( IMEP ) are from 0.9% to 2.8%. The rate of decrease in the smoke emission is 37.6%, and that in the NO X emission is 59.5% for a 60% load, 40% EGR ratio, and 20% added hydrogen.
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