A One-Dimensional Modeling Analysis of the Influence of Swirl and Tumble Coefficient in a Single-Cylinder Research Engine

The stricter legislation and the greater demand of the population regard to gas emissions and their effects on the environment as well as on human health make the automotive industry reinforce research focused on reducing levels of contamination. This reduction can be achieved through the implementation of improvements in internal combustion engines in such a way that they promote the reduction of both specific fuel consumption and air pollutant emissions. These improvements can be obtained through numerical simulation, which is a technique that works together with the experimental tests. The aim of this paper is to build, with support of the GT-SUITE software, a one-dimensional model of a single-cylinder research engine to analyze the impact of the variation of swirl and tumble coefficients on the performance and on the air pollutant emissions of this engine. Initially, the discharge coefficient is calculated through the software Converge CFD 3D, given that it is an input parameter in GT-POWER. Mesh sensitivity tests are made in 3D geometry built for this purpose, using the mass flow rate in the valve as reference. In the one-dimensional simulation is adopted the Spark-Ignition Turbulent Flame Model predictive combustion model and the validation performed by means of the cylinder pressure, crank angle at maximum cylinder pressure and indicated mean effective pressure. Finally, the swirl and tumble coefficients are introduced in their corresponding objects so that their influences on the performance of this engine can be observed when compared to the results to the baseline.