Accession Number:

AD0900401

Title:

SST Technology Follow-On Program - Phase I, a Summary of the SST Jet Noise Suppression Test Program

Descriptive Note:

Final rept. on Task 4

Corporate Author:

BOEING COMMERCIAL AIRPLANE CO SEATTLE WA

Personal Author(s):

• Wright, C. P.
• Morden, D. B.
• Simcox, C. D.

Report Date:

1972-02-15

Pagination or Media Count:

540.0

Abstract:

Supersonic aircraft require propulsion systems that are significantly different from those for present subsonic aircraft. The higher jet velocity of the supersonic aircraft engines will generate more noise during the actual takeoff run than conventional jet transport engines. An applied research program was conducted at The Boeing Company from February 1966 through March 1971 to investigate jet nozzle systems which will suppress jet noise levels from the supersonic transport with minimal thrust loss. These efforts applied to the two prototype supersonic transports being developed at that time as well as the commercial version of the SST that was to follow. The research program indicated that 12 to 20 PNdB noise suppression can be attained with less than 10 thrust loss by using multielement jet nozzle concepts. This report summarizes the test results pertaining to suppressor nozzle noise and thrust characteristics.

Descriptors:

• *JET TRANSPORT AIRCRAFT
• *ACOUSTIC INSULATION
• *JET ENGINE NOISE
• TEMPERATURE
• COMMERCIAL AIRCRAFT
• INTENSITY
• REDUCTION
• FLOW FIELDS
• FLIGHT PATHS
• TEST FACILITIES
• EXHAUST NOZZLES
• TURBOJET EXHAUST NOZZLES
• JET MIXING FLOW
• EXHAUST GASES
• SUPERSONIC AIRCRAFT
• TURBOJET ENGINES
• AUDIO FREQUENCY
• JET AIRCRAFT NOISE
• MAGNETIC TAPE
• PUBLIC OPINION
• THRUST
• DRAG
• PRESSURE
• INTERFERENCE
• STANDARDS
• INSTRUMENTATION

Subject Categories:

• Civilian Aircraft
• Acoustics
• Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE