The research on throttle influence on aerodynamic noise of gasoline engine intake system 2019-01-1485
Throttle, as a significant component for the engine, could play a central role on the control of the intake flow, and would influence the fuel consumption, emission and dynamic performance of the internal combustion engine. Fluctuating the air flow and generating the aerodynamic noise, the opening and closing of the throttle valve would largely increase the intake noise. In this research, the aerodynamic noise of the intake system under steady working conditions of the engine is calculated by the co-simulation of GT-Power, Fluent and LMS Virtual.Lab. With the coupled simulation between the two programs, GT-Power and Fluent, it could simulate the gas flow inside the engine intake system, under the actual running condition of engine. The velocity at the boundary of the intake system was used as the boundary condition for CFD calculation. The LES turbulence model with a prism layer of 0.01mm thickness was applied in the flow analysis. The pressure pulsation results calculated at each time step were preserved, which were finally imported into LMS Virtual.Lab as the acoustic excitation source of aerodynamic noise. The accuracy of co-simulation is verified through the comparison between intake noise test and co-simulation results of sound pressure level and psychological objective parameters. By comparing the intake system model with and without throttle, the influence of throttle at different opening angles on intake flow is analyzed. According to the relationship between flow and aerodynamic noise, the generation of the intake noise at different opening angles is studied. At the meanwhile, with the comparison of the sound pressure level, loudness, sharpness and roughness results of the intake system with or without throttle, a comprehensive consideration is made on the influence of throttle on the intake noise and its sound quality.
Ming Qin, Gao Wenzhi
Noise and Vibration Conference & Exhibition