Abstract
Rotary engines have been known to have some advantages compare to conventional reciprocating engines, such as higher output power for the same volume of combustion chamber and lower vibration.
One handicap of rotary engines is that the opening duration of intake valve is relatively short due to construction constraint.
Sofyan Adiwinata from Indonesia has patented a new concept of rotary engines with 2 flanks. This concept has allowed introducing a new improvement concept of additional intake valve. This concept in analyzed using simulation program, Raser2000, a computer program for simulating the thermodynamic process of rotary engines, developed by laboratory of combustion engines and propulsion system, Institute Technology Bandung, Indonesia.
The model of the simulation is using the equation of energy, the equation of heat transfer, the equation of work produced by working fluid, the equation of internal energy of working fluid and the integration method of Runge-Kutta third order is used to solve the governing equations.
The computations of thermodynamic process of rotary engines 2 flank show that the addition of intake valve can improve the overall performance, which can be seen from the increase of IHP, torque, thermal and volumetric efficiency.