Simulation of Free Piston Linear Engine Motion with Different Intake and Exhaust Port Positions

This paper presents the simulation of two-stroke free piston linear engine motion consisting of combustion and air-kickback chambers. dynamic and gas-dynamic models for slider-piston motion are presented.the influence of the intake and exhaust port position on the engine performance is xplored. using chosen variables, the motion of two-stroke free piston linear engine is successfully simulated. it shows that the velocity profile of slider-piston motion is far from sinusoidal. the comparison between both simulations with different location of intake and exhaust port reveals that the slider-piston elocities are not similar. slider-piston velocity of model 2 with intake and exhaust port at the top of the cylinder block is 19% higher than model 1 (intake and exhaust port at the cylindrical-side of cylinder block). although that was the case, model 1 has an advantage in a way that it does not need valves and penclosevalves system.