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Title of Journal: Exp Fluids

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Abbravation: Experiments in Fluids

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Springer Berlin Heidelberg

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10.1002/ijc.20325

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1432-1114

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Development and characterization of highfrequency

Authors: Puja Upadhyay Jonas P R Gustavsson Farrukh S Alvi
Publish Date: 2016/05/07
Volume: 57, Issue: 5, Pages: 88-
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Abstract

For flow control applications requiring highfrequency excitation very few actuators have sufficient dynamic response and/or control authority to be useful in highspeed flows Due to this reason experiments involving highfrequency excitation attempted in the past have been limited to either lowfrequency actuation with reasonable control authority or moderatefrequency actuation with limited control authority The current work expands on the previous development of the resonanceenhanced microactuators to design actuators that are capable of producing highamplitude pulses at much higher frequencies mathcal O 10 kHz Using lumped element modeling two actuators have been designed with nominal frequencies of 20 and 50 kHz Extensive benchtop characterization using acoustic measurements as well as optical diagnostics using a highresolution microschlieren setup is employed to characterize the dynamic response of these actuators The actuators performed at a range of frequencies 203–278 and 548–782 kHz respectively In addition to providing information on the actuator flow physics and performance at various operating conditions this study serves to develop easytointegrate highfrequency actuators for active control of highspeed jets Preliminary testing of these actuators is performed by implementing the 20kHz actuator on a Mach 09 free jet flow field for noise reduction Acoustic measurements in the jet near field demonstrate attenuation of radiated noise at all observation angles

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