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Acoustic, thrust, and drag characteristics of several full-scale noise suppressors for turbojet engines / by Carl C. Ciepluch [and three others].
Connect to full text Available online
View online- Format:
- Book
- Government document
- Author/Creator:
- Ciepluch, Carl C., author.
- Series:
- Technical note (United States. National Advisory Committee for Aeronautics) ; 4261.
- Technical notes / National Advisory Committee for Aeronautics ; No. 4261
- Language:
- English
- Subjects (All):
- Jet planes--Noise.
- Jet planes.
- Airplanes--Turbojet engines--Mufflers.
- Airplanes.
- Noise control--Research.
- Noise control.
- Physical Description:
- 1 online resource (48 pages) : illustrations
- Place of Publication:
- Washington [D.C.] : National Advisory Committee for Aeronautics, 1958.
- Summary:
- An experimental investigation was conducted to determine the acoustic, internal thrust, and external drag characteristics of several fullscale turbojet-exhaust noise suppressors on an engine in the 10,000-pound- thrust class. Acoustic measurements were made around an outdoor thrust stand. The thrust and drag data were obtained in an altitude wind tunnel over a range of Mach numbers up to 0.5.
- The most efficient configurations were a two-position mixing nozzle with ejector and a 12-lobe nozzle, considering both exhaust-jet noise reduction and loss in engine propulsive thrust due to either internal thrust losses or afterbody-drag increases. At a Mach number of 0.5 the respective propulsive thrust losses were about 1 and 3 percent. Calculations indicate that, from the standpoint of the ground observer, the aircraft takeoff noise from these two suppressors should be 5 or 6 decibels less than that of the standard convergent nozzle.
- Notes:
- Title from title screen (viewed March 7, 2019).
- "April 1958."
- "Lewis Flight Propulsion Laboratory, Cleveland, Ohio."
- No Federal Depository Library Program (FDLP) item number.
- Includes bibliographical references (pages 18-19).
- Print version record.
- Other Format:
- Paper version: Ciepluch, Carl C. Acoustic, thrust, and drag characteristics of several full-scale noise suppressors for turbojet engines
- OCLC:
- 1100474448
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