| Download | - View final version: Preliminary tests with a silencing screen installed in the exhaust duct of cell 3, with an Olympus 102 engine (PDF, 4.5 MiB)
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| DOI | Resolve DOI: https://doi.org/10.4224/40003908 |
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| Author | Search for: Cockshutt, E. P.1 |
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| Affiliation | - National Research Council Canada. National Aeronautical Establishment
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| Format | Text, Memorandum |
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| Physical description | 10 p. |
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| Abstract | A shrouded screen located one nozzle diameter downstream of the engine propelling nozzle reduced the noise level near the Engine Laboratory by about 15 db at the cruising speed of the engine. The blockage produced by the screen reduced the induced air flow through the cell from a value equal to the engine mass flow to about half that value, and thereby raised the temperature of the gases in the exhaust duct to nearly 400°C. The engine jet pipe temperature rose by about 10°C . An unpleasant resonance was excited over a fairly narrow range of engine speed, and this range was markedly widened by relocating the screen two diameters downstream of the propelling nozzle. |
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| Publication date | 1957-01-08 |
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| Publisher | National Research Council Canada |
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| Series | |
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| Language | English |
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| Peer reviewed | No |
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| Identifier | NAE-361 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 4b3367a2-25d1-4ada-94b3-b212394d5ca3 |
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| Record created | 2025-11-28 |
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| Record modified | 2025-11-28 |
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