Quiet bleed valve for gas turbine engine

A method of reducing noise from a bleed valve that expels a gas from a compressed region, the bleed valve including a valve section includes a centerbody and a housing, the gas flowing between the centerbody and the housing, the centerbody being coupled to the housing by at least one strut disposed substantially radially, and a muffler section coupled to the valve section and downstream of the valve section, the muffler section including a baffle plate and a dome plate, the baffle plate being placed upstream of the dome plate, the method comprising:

• inserting at least one honeycomb flow straightener in the muffler section, wherein inserting the at least one honeycomb flow straightener includes placing the at least one honeycomb section between the baffle plate and the dome plate;
• and
• streamlining a cross-sectional shape of the at least one strut to reduce or suppress flow separation and vortex shedding from the at least one strut.

A bleed valve for expelling a gas from a compressed region, the bleed valve comprising:

• a valve section including a centerbody and a housing, the gas flowing between the centerbody and the housing, the centerbody being coupled to the housing by at least one strut disposed substantially radially;
• and
• a muffler section coupled to the valve section and being downstream of the valve section, the muffler section comprising at least two perforated plates and at least one honeycomb, wherein the gas flows through the at least one perforated plate and the at least one honeycomb, wherein the at least two perforated plates include a baffle plate and a dome plate, the baffle plate being placed upstream of the dome plate, and the at least one honeycomb is a honeycomb section located between the baffle plate and the dome plate.

A bleed valve for expelling a gas from a compressed region, the bleed valve comprising:

• a valve section including a centerbody and a housing, the gas flowing between the centerbody and the housing, the centerbody being coupled to the housing by at least one strut disposed substantially radially, the at least one strut having a cross-section that reduces or suppresses flow separation and vortex shedding from the at least one strut;
• and
• a muffler section coupled to the valve section and being downstream of the valve section, the muffler section comprising at least two perforated plates and at least one honeycomb, wherein the gas flows through the at least two perforated plates and the at least one honeycomb, wherein the at least two perforated plates include a baffle plate and a dome plate, the baffle plate being placed upstream of the dome plate, and the at least one honeycomb is a honeycomb section located between the baffle plate and the dome plate.