Numerical Simulation and Optimization for Combustion of an Opposed Piston Two-Stroke Engine for Unmanned Aerial Vehicle (UAV) 2020-01-0782
The opposed-piston two-stroke engine is more suitable for the UAV, due to its smaller size, better self-balancing, stable operation and lower noise. Consequently, in this work, based on the experimental data of a prototype opposed piston two-stroke engine, the numerical simulation model are established by AVL-FIRE. The mesh grid and solver parameters of the numerical model are discussed for guaranteeing the accuracy of numerical simulation, and then the ventilation efficiency of the engine with different dip angles and elevation angles have been studied and optimized. Moreover, the fuel spray process and subsequent combustion as well as NOx emissions have been analyzed in details. Finally, the engine combustion parameters have been optimized by orthogonal test design method.