Abstract
To reduce the tonal noise of axial fans loudspeakers are typically used to generate the required anti-phase sound field. The space requirement and the weight of the loudspeakers inhibit practical application of this method. In the present study the secondary sound field is generated by injecting high speed air jets into the rotor blade tip regime. The air jets set up additional periodic forces on the blade tips which in turn form the required secondary acoustic sources. The jets are driven by a compressed air supply through small nozzles mounted flush with the inner casing wall. It has been shown, that this approach is very effective in controlling higher order mode sound fields at blade passage frequency and its harmonics. The main goal of the present work is to introduce fast feedback control to this application.
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Lemke, O., Neise, W., Enghardt, L., King, R., Muminovic, R., Möser, M. (2010). Closed Loop Blade Tone Control in Axial Turbomachines by Flow Induced Secondary Sources in the Blade Tip Regime. In: King, R. (eds) Active Flow Control II. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 108. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-11735-0_10
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DOI: https://doi.org/10.1007/978-3-642-11735-0_10
Publisher Name: Springer, Berlin, Heidelberg
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