NOISE DUE TO THE INTERACTION OF BOUNDARY LAYER TURBULENCE WITH A MARINE PROPULSOR OR AN AIRCRAFT COMPRESSOR
The sound generated by the interaction of inlet boundary layer turbulence with a rotating blade row is investigated. To experimentally study this radiated sound, an existing aeroacoustic facility was modified to produce the inflows desired. The rotor was operated in air with different blade space-to-chord ratios, different flow coefficients and different anisotropic, nonhomogeneous turbulent inflows. The inflows ingested are: (1) natural boundary layer on hub and annulus wall, (2) a tripped boundary layer on the hub, and (3) a fully developed boundary layer on the hub. The turbulence intensities and length scales were altered by placing a grid at the inlet. The sound pressure level is found to be directly proportional to the turbulence intensity squared and inversely proportional to the ratio of axial length scale to blade spacing.
- Master's thesis.
Pennsylvania State University, University ParkApplied Research Laboratory
University Park, PA USA 16802
- Moiseev, N
- Lakshminarayana, B
- Thompson, D E
- Publication Date: 1976-10-11
- Pagination: 122 p.
- TRT Terms: Acoustic measuring instruments; Acoustics; Aerodynamics; Aircraft; Boundary layer flow; Compressors; Correlation analysis; Culvert inlets; Engines; Equipment tests; Marine diesel engines; Noise; Propulsion; Spectrum analysis; Test procedures; Theses; Turbulence; Vehicle power plants
- Uncontrolled Terms: Aircraft engines; Inlets; Interaction; Propulsion systems
- Old TRIS Terms: Acoustic measurement; Aerodynamic characteristics; Marine propulsion; Radiated noise; Test equipment
- Subject Areas: Aviation; Data and Information Technology; Environment; Marine Transportation; Vehicles and Equipment;
- Accession Number: 00166033
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: TM-76-258
- Contract Numbers: N00017-73-C-1418
- Files: TRIS
- Created Date: Sep 20 1977 12:00AM