Thermodynamic Process Modeling in Pressure Wave Superchargers

Abstract

The Pressure Wave technology has proved real potential in improv-ing performance and efficiency of thermodynamic systems. Its working prin-ciple is based on the transfer of energy between two fluids that are in direct con-tact for a very short period of time. This technology was implemented in many various applications, including: pressure wave superchargers for internal com-bustion engines, wave rotor constant volume combustors, novel generation of rotary thermal separators, wave rotor refrigerators, ultra-micro gas turbines, heat exchangers cleaning devices, etc. This paper is a theoretical analysis of the evolution of the pressures along the wave rotor channels for the exhaust gases and for the fresh air. Furthermore, a simulation of the phenomenon at the contact of the two fluids is provided in or-der to show the interaction of the high energy fluid with the low energy fluid. The theoretical analysis was made using COMSOL Multiphysics software. The study results were represented graphically. The simulation was modeled to reproduce data such as pressures, mass flows and velocities usually measured in real engine pressure wave supercharging. Results were obtained at different range of operating time aiming a high boost pressure into the intake manifold that can assure a better response in increasing the engine power.