| Title | Comparative Studies of the Supersonic Jet Noise Generated by Rectangular and Axisymmetric Nozzles |
|---|---|
| Record ID | 49050 |
| Personal Name Creator |
Low, Khoon Cheang; Louis, Jean F. |
| Source | 118p. in various pagings |
| Corporate Creator | Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics |
| Corporate Contributor |
John A. Volpe National Transportation Systems Center (U.S.) |
| Publisher | United States. Dept. of Transportation. Office of the Secretary |
| Publication Date | 19730601 |
| Language | English |
| Abstract | The main purpose of this study is to develop experimental scaling laws useful for predicting the overall sound power of supersonic jets operating under a range of high stagnation temperatures and pressures and under various exit Mach numbers. A shock tube is used as a flexible tool to provide the range of high stagnation temperatures and pressures associated with the supersonic jets in this investigation. The range of stagnation pressures chosen (for a given temperature and Mach number) correspond to overexpanded, perfectly expanded and underexpanded conditions of the jet. Two different nozzle configurations: a rectangular and an axisymmetric, are examined to determine how a basic difference in shapre of the jet changes the relative importance of the different noise generating mechanisms. Measured sound directivity and Mach waves propagation direction obtsained from shadowgraphs indicate that Mach waves contribute importantly to the noise produced by a rectangular jet. |
| Rosap ID | dot:10531 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/10531 |
| TRT Terms | Noise; Aircraft noise; Aerodynamics; Jet propelled aircraft; Supersonic aircraft; Sound level; Measurement |
| Classification | NTL - AVIATION - AVIATION; NTL - AVIATION - Aviation Energy and Environment; NTL - ENERGY AND ENVIRONMENT - Aviation Energy and Environment |
| Geographical Coverage |
United States |
| Report Number | DOT-TSC-OST-73-22; PB-221 855 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/49000/49000/49050/DOT-TSC-OST-73-22.pdf |
| Format | |
| Database | NTL Digital Repository |