| Download | - View final version: Some tests on silencing the jet engine exhaust noise in No. 5 test cell (PDF, 3.8 MiB)
|
|---|
| DOI | Resolve DOI: https://doi.org/10.4224/40003913 |
|---|
| Author | Search for: Wisniowski, H. U.1 |
|---|
| Affiliation | - National Research Council Canada. National Aeronautical Establishment
|
|---|
| Format | Text, Memorandum |
|---|
| Physical description | 13 p. |
|---|
| Abstract | The temperature and velocity distribution in the last element of the multiple ejector exhaust duct was measured, using television for instrument readings. These measurements were made with uncovered and covered annular slots of the multiple ejector. No difference in outside noise level was found in these two cases.
Two screens have been tested successively. The first one ("engine screen") was mounted vertically on the exhaust duct inlet. The second one ("stack screen") was mounted horizontally on the exhaust elbow in the stack. The reduction of the outside noise level by the engine screen alone, was 12 - 14 decibels, depending on measuring distance. The reduction due to the stack screen alone was 4-5 decibels. However, both screens together reduced the noise by 13 - 15 decibels. It can be deduced from these results that the stack screen suppresses the engine noise coming through the exhaust duct and it does it appreciably only in case when this noise is not reduced at the engine itself. |
|---|
| Publication date | 1957-04-30 |
|---|
| Publisher | National Research Council Canada |
|---|
| Series | |
|---|
| Language | English |
|---|
| Peer reviewed | No |
|---|
| Identifier | NAE-496 |
|---|
| Export citation | Export as RIS |
|---|
| Report a correction | Report a correction (opens in a new tab) |
|---|
| Record identifier | 17a2f526-1e4f-4e6c-9612-e2c92ba2ebe7 |
|---|
| Record created | 2025-12-01 |
|---|
| Record modified | 2025-12-01 |
|---|
