Dual purpose apparatus for turbine engine exhaust noise and anti

Details Dual purpose apparatus for turbine engine exhaust noise and anti Dual purpose apparatus for turbine engine exhaust noise and anti

1989-12-29

1992-03-24

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

With exhaust treatment

60262, 181213, F02C 7045

Patent

active

050976567

ABSTRACT:
In order to reduce turbine engine exhaust noise while simultaneously reducing anti-surge airflow noise, a combination noise reduction apparatus or tube (10) is provided having a series of holes (26) in its side. The tube (10) is in communication with a source of anti-surge air through an anti-surge air outlet (22) to be delivered into the exhaust airflow in an exhaust duct (12). The tube (10) diffuses the anti-surge air, shields the noise of the anti-surge air by dissipating the acoustic energy within the tube (10), and provides for an even distribution of the anti-surge air into the exhaust airflow. As a result, a temperature discontinuity is created in the exhaust duct (12) which results in an acoustic impedance that reflects acoustic noise back to the source of the noise.

REFERENCES:
patent: 3210934 (1965-10-01), Smale
patent: 3998047 (1976-12-01), Walker
patent: 4095417 (1978-06-01), Banthin
patent: 4214441 (1980-07-01), Mouritsen et al.
patent: 4380893 (1983-04-01), Stokes et al.

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