Experimental Study of Aerodynamic Noise From the Trailing Edge and Leading Edge of Blades in a Coaxial-Double Shaft Fan

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Conference Proceeding
Proceedings of the ASME 2013 Fluids Engineering Division Summer Meeting, 2013, pp. 1 - 7
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paper reports on the experimental investigation on two methods in controlling aerodynamic noise. A counter-rotatingdouble- row-turbine with variable gap/spacing (s) was designed, built and tested. Serrations were designed and attached on the leading edge and the trailing edge of the blades to proactively control aerodynamic noise. The model was operated in fanmode and air velocity, shaft-revolution; electric-fan-power, acoustic noise amplitude (dB) and Centre frequency (CF in Hz) were measured for a number of spacing and serrations. Coefficients of Performance (COP), dB, CF were plotted against tip speed (TS).
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