Synthetic jet actuator performance enhancement and in depth exploration

Van Buren, Tyler
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Other Contributors
Amitay, Michael
Oberai, Assad
Sahni, Onkar
Whalen, Edward
Issue Date
Aeronautical engineering
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This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
The effects of different geometries and input parameters on the flow structures and performance characteristics of a finite span synthetic jet were explored in a quiescent fluid. Two scales of actuator apparatuses are used, 32 mm and 64 mm diameter piezoelectric disks. Hotwire, laser displacement sensor, and pressure transducers were used to quantify the performance of a given actuator and the effect of varying neck height, cavity height, orifice length, orifice width, and piezoelectric disk thickness was explored for both single and dual disk configurations. Stereoscopic Particle Image Velocimetry (SPIV) was utilized to explore the effects of actuator neck length, aspect ratio, and the Reynolds number on the flow structures formation and evolution. The different parameters, which are essential to the formation of a synthetic jet, including disk displacement, cavity pressure, and jet exit velocity were isolated and investigated in depth. It is found that changing the geometry had significant effect on the performance characteristics of the synthetic jet (for both scales). For both synthetic jet sizes, the cavity resonances were detected and found to be sensitive to different geometries. Changing the geometry also affected the flow field behavior when analyzing the velocity and vorticity fields surrounding the orifice in both the time average and phase average. A phase difference was found between the disk displacement and the jet exit velocity and is explained in detail in this document. A model was constructed that is successful in predicting the jet velocity at the orifice for an input cavity and orifice geometry and disk deflection. Understanding the effects of geometry and input parameters on the synthetic jet actuator is crucial in taking steps toward improving the design and application of synthetic jets.
May 2013
School of Engineering
Dept. of Mechanical, Aerospace, and Nuclear Engineering
Rensselaer Polytechnic Institute, Troy, NY
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