6th INTERNATIONAL CONGRESS ON APPLIED SCIENCES, Edirne, Turkey, 6 - 08 May 2022, pp.25-26
The increasing population increases the number of vehicles, and accordingly, the need for energy increases. Although these energy needs are tried to be met from renewable resources, this amount still constitutes a very small part of the total energy consumed. The remaining energy needs continue to be met from petroleum-based conventional fuels. The use of these petroleum-based fuels increases both oil prices and environmental pollution. With the increasing environmental pollution, emission regulations become more stringent and it is expected that the engines used every year will provide lower emission values. In order to achieve these emission values, the search for alternative fuels has increased rapidly instead of conventional fuels. In this context, natural gas is one of the most recent alternatives fuel studies. In the study, the 3-cylinder tractor engine was modeled using AVL Boost as in 0/1-dimensional, with the placement of the spark plug instead of the diesel injector, and the natural gas fuel injector to the intake manifold. One of the most important factors affecting the result of the numerical study is the combustion models used. In the study, the effects of two different combustion models, Vibe and Vibe 2-Zone, on performance, combustion, and emission characteristics were investigated. In terms of engine performance, the maximum difference between the use of the two models was 0.32% in brake power, while this difference was 1.4% in in-cylinder pressure. While cumulative NOX, HC, and CO emission values were provided in the Vibe 2-Zone combustion model, these values could not be obtained in the Vibe combustion model.