EMISSION MEASUREMENTS IN DUAL FUELED INTERNAL COMBUSTION ENGINE TESTS

Abstract: Dual fueled engine test procedures and result interpretation are not available in the literature, This paper describes a methodology for calculating the emission mass flow rates, using the chemical reaction mass balance of the components. The experimental data were obtained from tests made at the MWM dynamometer. Starting from basic principles, the hydrocarbon (HC) mass flow rate was related to molar concentration through the molecular mass and the exhaust gas mass flow rate, and compared to the available expressions in the EPA diesel engine test standard. The dual fuel model was established by a linear combination for the hydrocarbon (HC) equivalent molecular mass, when there is 0 % and 100 % natural gas in the fuel. Finally, the paper shows that, by a similar methodology, the natural gas mass flow rate can be calculated from emission measurements