Glenn
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- NASA Glenn engineers introduced rotating-microphone procedures during the 1990s.
- The Low Noise Wind Tunnel referenced measures 9 feet by 15 feet.
- With NASA funding, a technique was created to place microphones inside an engine’s fan duct to locate noise sources on rotating blades.
- Periodic disturbances, such as a fan-blade wake hitting a downstream stator vane, can produce annoying tonal noise.
- Turbulent air entering an aircraft engine generates broadband noise.
- Researchers use hot-wire probes and Laser Doppler Velocimeters to measure air velocity upstream, downstream, and between rotor and stator of an experimental propulsor.
- Data from hot-wire probes and LDV are routinely applied to validate calculations that predict turbofan engine noise.
- NASA’s Glenn Research Center is located at Lewis Field in Cleveland, Ohio.
