ABSTRACT
ABSTRACT: Opposite axial piston engine could improve the power density of the engine effectively by increasing the number of cylinders and the working frequency. As the main power transmission component of engine, the unsymmetrical cam is invented to increase combustion efficiency. Based on the structure introduction of the axial piston engine, the working principle of engine is presented. Then the mathematical model of unsymmetrical profile of cam is built and analyzed. Under the assumption of no heat loss during the whole working process, the thermodynamic model of the engine is established. The Vibe function is applied to simulate the heat release during the combustion process. The results show that the unsymmetrical cam profile can improve the combustion efficiency by increasing the maximal combustion pressure. The maximal pressure in cylinder can be increased by 28% when the unsymmetrical coefficient is set to 2.
