Abstract The alternating movement of the inlet valve and the piston of an internal combustion engine generates pressure waves propagating along the intake duct. This phenomenon alters the admitted air… Click to show full abstract
Abstract The alternating movement of the inlet valve and the piston of an internal combustion engine generates pressure waves propagating along the intake duct. This phenomenon alters the admitted air mass flow inside the engine cylinder in some speed ranges. To mitigate the harmful effects of the wave phenomenon, acoustic elements are inserted into the intake system, such as Helmholtz resonators, plenums and Herschel-Quincke tubes. This paper aims to numerically evaluate the air flow in the intake ducts using Herschel-Quincke tubes. The numerical study was carried out using software based on the Characteristics Method, which, considering the one-dimensional transient flow, simulates the wave phenomena inside the ducts. As a result, it was observed that the Herschel-Quincke tubes reduce the pressure amplitude at the inlet valve port, increasing the air flow velocity and the intake air mass flow.
               
Click one of the above tabs to view related content.