ABSTRACT
Results and corresponding conclusions reported in the technical literature relating to the employment of gaseous fuels in dual-fuel engines often describe tendencies that are specific to the engine setup and the gaseous fuel employed. Since gaseous fuels, including natural gases and liquefied petroleum gases (LPGs), can sometimes vary widely in composition, especially in terms of the concentrations of higher hydrocarbons and diluents, it is necessary whenever evaluating results of engine performance to keep the effects of such possible variations in mind and to account for their possible contribution. Accordingly, it is preferable when investigating some aspects of the combustion processes in dual-fuel engines to refer, whenever possible, to fuels of known composition or, even better, to pure fuels rather than, for example, a generic natural gas or biogas fuel.
