Power plants – Pressure fluid source and motor – Coaxial impeller and turbine unit
Patent
1981-02-17
1984-01-24
Capossela, Ronald C.
Power plants
Pressure fluid source and motor
Coaxial impeller and turbine unit
60409, 415 36, 415119, 417 47, F16D 3302
Patent
active
044268459
ABSTRACT:
Disclosed is a method and apparatus for reducing the level of noise emitted by air turbine machinery, particularly a pneumatically driven hydraulic pump for an airplane, wherein a modulating valve meters the flow of air from a source of pressurized air through a conduit to an air turbine to control the speed of the turbine. A pressure regulating valve is located in the air conduit upstream of the modulating valve to regulate and maintain the upstream pressure on the modulating valve at substantially the minimum pressure required in order to permit operation of the air turbine over its full range of speed as the amount of airflow is varied with the modulating valve. Reducing the pressure across the modulating valve in this manner minimizes the production of supersonic airflow and attendant noise by the modulating valve, which noise is otherwise propagated to the atmosphere through the turbine exhaust stream and is additionally radiated by the turbine casing. Preferably, a muffler is interposed in the air conduit between the pressure regulating valve and the pressure modulating valve. In another aspect of the invention, a pressure feedback conduit couples an actuator of the pressure regulating valve to a point in the air conduit immediately upstream from the pressure modulating valve such that the pressure regulating valve operates under pneumatic feedback control to maintain a substantially constant upstream pressure on the pressure modulating valve. Preferably, such upstream pressure maintained on the modulating valve is substantially equal to the maximum inlet pressure to the air turbine, such that the modulating valve is operated in a wide-open position with negligible pressure drop to obtain full speed of the air turbine.
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Brooks George W.
Hart John W.
Pettersen Egil R.
Capossela Ronald C.
The Boeing Company
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