Turbocharger system including acoustic damper for attenuating aerodynamically generated noise from compressor

A turbocharger system, comprising:

• a turbocharger comprising a turbine including a turbine housing, and a compressor including a compressor housing, the compressor housing defining an air inlet for conducting air into the compressor and a discharge pipe for conducting pressurized air out from the compressor;
• and
• an acoustic damper coupled to one of the air inlet and the discharge pipe of the compressor, the acoustic damper comprising:
• an upstream wall defining an inlet aperture therein;
• a downstream wall defining an outlet aperture therein, the inlet and outlet apertures being spaced apart a distance D along an axial direction along which the fluid flows;
• an inner duct for conducting the pressurized air received through the inlet aperture, the inner duct comprising an inner duct wall supported on the upstream wall and extending downstream from the upstream wall for a length L which is less than D;
• an outer duct comprising an outer duct wall connected between the upstream wall and the downstream wall, the outer duct wall surrounding the inner duct wall such that an annular cavity is defined between the inner and outer duct walls, an expansion chamber being bounded between the downstream wall, the outer duct wall, and a downstream end of the inner duct wall, and wherein the annular cavity at a downstream end thereof is open to the expansion chamber;
• and
• partition walls that extend between the inner and outer duct walls and partition the annular cavity into at least first and second quarter-wave resonators that are open to the expansion chamber and at least a first Helmholtz resonator, the inner duct wall defining at least one hole therethrough connecting the first Helmholtz resonator with an interior of the inner duct, wherein the first quarter-wave resonator and the first Helmholtz resonator are axially serially arranged with respect to each other, and the second quarter-wave resonator and the first Helmholtz resonator are circumferentially serially arranged with respect to each other.