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Characterization of bidirectional impulse turbines for thermoacoustic engines
Michael A G Timmer1, Theo H van der Meer1
1Department of Thermal Engineering, University of Twente, Enschede, The Netherlands.
Abstract:
A bidirectional impulse turbine to convert thermoacoustic power into electricity is investigated. Experimental measurements are done with a loudspeaker for varying acoustic conditions and turbine loads. The results are used to characterize the turbine performance and compare it to steady flow turbomachinery and turbines in oscillating water columns. A dimensional analysis is done to identify the variables that influence the turbine performance, after which a scaling is determined that uniquely determines the efficiency of the turbine. The work is finished by providing the impedance of the bidirectional turbine such that it can be implemented in a thermoacoustic engine.
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