Abstract
The fluidic oscillator is a device that generates an oscillating jet when supplied with fluid at pressure. The oscillator has no moving parts — the creation of the unsteady jet is based solely on fluid-dynamic interactions. Fluidic oscillators can operate at frequencies ranging up to 20 kHz, and are useful for flow control applications. The fluidic oscillator evaluated in the current study is comprised of two fluid jets that interact in an internal mixing chamber, producing the oscillating jet at the exit. Both porous pressure-sensitive paint (PSP) and dye-colored water flow are used to visualize the internal and external fluid dynamics of the oscillator. Porous PSP formulations have been shown to have frequency responses on the order of 100 kHz, which is more than adequate for visualizing the fluidic oscillations. In order to provide high-contrast PSP data in these tests, one of the internal jets of the fluidic oscillator is supplied with oxygen, and the other with nitrogen. Results indicate that two counter-rotating vortices within the mixing chamber drive the oscillations. It is also shown that the fluidic oscillator possesses excellent mixing characteristics.
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Jim Gregory: He received his B. of Aerospace Engineering with highest honors in 1999 from the Georgia Institute of Technology. He also received his M.S. in Aeronautics and Astronautics in 2002 from Purdue University. He is currently a Ph.D. candidate at Purdue University in the School of Aeronautics and Astronautics, and funded by the NASA Graduate Student Researchers Program (GSRP). In 2005 he was a recipient of the AIAA Orville and Wilbur Wright Graduate Award. His research interests include unsteady measurements with pressure-sensitive paint, and development of flow control actuators such as the fluidic oscillator.
John Sullivan: He received his B.S. in mechanical and aerospace sciences with honors from the University of Rochester in 1967, MS in 1969 and ScD in 1973 in aeronautical engineering from the Massachusetts Institute of Technology. Professor Sullivan has been a faculty member in the School of Aeronautics and Astronautics at Purdue since 1975, served as the director of the Aerospace Sciences Laboratory from 1983–1995, Head of the School from 1993–1998, and is Director of the Center for Advanced Manufacturing since 2004. His research interests include experimental aerodynamics, as well as advanced measurement techniques in fluid dynamics.
Surya Raghu: He received the Ph.D. degree in mechanical engineering from Yale University in 1987. He was a post-doctoral fellow at Yale in 1987–88, a Humboldt Scholar at the Technical University of Berlin, Germany, (1989–90), Assistant Professor at SUNY Stony Brook (1990–95), Senior Research Engineer/Principal Research Scientist at Bowles Fluidics Corporation (1996–2000) and is the president of Advanced Fluidics, MD, since 2001. His research interests include development of meso- and microfluidic actuators for aerospace applications, chemical and bio-sensors and fuel cells. Dr. Raghu is a recipient of the Alexander von Humboldt award from Germany and has been a visiting scientist at NIST and AFOSR Laboratories. He has been awarded 6 patents and has several patents pending as an inventor or co-inventor. He is a member of ASME and AIAA.
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Gregory, J.W., Sullivan, J.P. & Raghu, S. Visualization of jet mixing in a fluidic oscillator. J Vis 8, 169–176 (2005). https://doi.org/10.1007/BF03181660
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DOI: https://doi.org/10.1007/BF03181660