Study on Influential Mechanism of Trailing Edge Sweep Angle on Aerodynamic Noise of a Centrifugal Air Compressor

As the main noise source in hydrogen fuel cell system, level of centrifugal air compressor greatly affects comfort vehicle, and can be effectively reduced by optimizing trailing edge sweep angle blade. In this paper, computational fluid dynamics model was used to study influence on aerodynamic performance flow characteristics a for vehicle cells. The Ffowcs Williams–Hawkings equation dynamics–boundary element coupling method were adopted calculate dipole strength surface blade radiated noise, respectively, under different angles. results showed that could lead an increase pressure ratio as well isentropic efficiency, decrease intensity separation. Meanwhile, sound each working condition sweep. When rotation speed 80,000 r·min−1 15°, 5.8 dBA lower than without