Study of Scavenging and Combustion Processes for Small Two-Stroke Aviation Heavy Fuel Direct Injection Engines

Heavy-fuel aviation piston engines (HF-APEs) are widely used in general and unmanned aerial vehicle (UAV) due to their safety fuel economy. This paper describes a numerical experimental study of scavenging combustion processes on 2-Stroke Direct Injected HF-APEs for light aircraft, with its cylinder specifically designed as cross scavenging. A 3-Dimentional transient model in-cylinder flow process is established by the Forte platform, engine test system set up. By comparing simulation results results, it showed that multi-ports can generate unbalanced aerodynamic torque cylinder. In compression process, swirl ratio (SR) gradually increases, peak SR reaches 15. Moreover, approximately 25% exhaust residual gas conducive atomization evaporation high-altitude environment. When injection timing between −8 °CA −16 °CA, has optimal power economy performance at different altitudes. Finally, when advance angle moves forward 4 maximum pressure increases 2 MPa, rising rate decreasing gradually. The have important significance development small HF-APEs.