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Cruise noise of the sr-2 propeller model in a wind tunnel
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Dittmar, James H. |
| Copyright Year | 1989 |
| Description | Noise data on the SR-2 model propeller were taken in the NASA Lewis Research Center 8- by 6-Foot Wind Tunnel. The maximum blade passing tone rises with increasing helical tip Mach number to a peak level at a helical tip Mach number of about 1.05; then it remains the same or decreases at higher helical tip Mach numbers. This behavior, which has been observed with other propeller models, points to the possibility of using higher propeller tip speeds to limit airplane cabin noise while maintaining high flight speed and efficiency. Noise comparisons of the straight-blade SR-2 propeller and the swept-blade SR-7A propeller showed that the tailored sweep of the SR-7A appears to be the cause of both lower peak noise levels and a slower noise increase with increasing helical tip Mach number. |
| File Size | 1172236 |
| Page Count | 29 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19890015515 |
| Archival Resource Key | ark:/13960/t16m84z49 |
| Language | English |
| Publisher Date | 1989-04-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Directivity Harmonics Turboprop Aircraft Propellers Aircraft Noise Sweep Effect Wind Tunnel Tests Aerodynamic Noise Boundary Layers Mach Number Tip Speed Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
