Numerical simulation and experimental analysis of acoustic wave influences on brake mean effective pressure in thrust–ejector inlet pipe of combustion engine

This paper is focused on a numerical simulation and experimental analysis of acoustic wave influences on brake mean effective pressure in a thrust–ejector inlet pipe of a piston combustion engine. The experiment is based on a real racing motorbike, which is driven by a piston combustion engine, equipped with a newly developed and patented thrust–ejector inlet pipe. This new inlet pipe is able to eliminate problems concerning an insufficient charging of cylinder with a fresh mixture. The engine sucks the air by overpressure, which is directly related to increased performance and torque. The first part of this paper presents the analytical relations describing acoustic waves in an inlet pipe. The next part contains a numerical simulation performed by software Ansys CFX in order to obtain a detailed description of flowing air, which passes through the ejector into the air box. The experimental measurements were realised using the data–recording system EW&C.