FlowPAC Acoustics Research Scott C. Morris Thomas J. Mueller.

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Presentation transcript:

FlowPAC Acoustics Research Scott C. Morris Thomas J. Mueller

Overview Basic and applied research Mix of theoretical, computational, and experimental capabilities Experimental tools include: –Anechoic Wind Tunnel (AWT) –Phased Microphone Array –Laser vibrometry –Particle Image Velocimetry

Schematic of Rotor Wake Phenomena

Swirling Flow Phenomena

Wake Distortion by Swirl

Top View of the Acoustic Pressure of a 3D Cascade with 30 o Stagger

Experimental Approach: Acoustic Theory LES calculations Hot-wire & PIV measurements Far field signature Boundary Conditions Unsteady wall pressure

Acoustic Arrays Array Panel #1 Flow Model

Beamforming Results (Example SPL map) U ref = 69 ft/s Array #1 z = 42 in. Test section boundary Model trailing edge location Flow: L to R Inlet noise Trailing edge noise Collector noise

How well does the array work? LOW Frequency example Combined sound BF-Left BF-Right

Acoustic spectra: 3 regions Low frequency Vortex shedding Broadband

PIV Experimental Setup Trailing Edge 12-bit CCD Cameras Nd YAG Lasers Lasers Sheet Camera view areas Flow

Instantaneous Flow Field Resutls shadow area

Instantaneous vorticity contours

Phase averaged vorticity

Prediction of broadband sound

Current Projects Include: Trailing Edge Sound Ducted Propulsion Acoustics of very light fluid-structure interactions Window buffeting Effect of structural acoustics on dipole source strength

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