Abstract
A novel method of creating homogeneous and isotropic turbulence with small mean flow has been developed. Eight synthetic jet actuators on the corners of a cubic chamber can create energetic turbulence with root-mean-square (rms) velocities as large as 0.87 m/s, corresponding to a Taylor microscale Reynolds number, Re λ , of 218. Stationary turbulence results show that the turbulence was isotropic, with the rms velocity ratio equal to 1.03, and also homogeneous within the region of interest. Natural decaying turbulence measurements confirmed the power-law decay of the turbulent kinetic energy, with the decay exponent n equal to 1.86 for an initial Re λ of 224.
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Acknowledgements
This research was supported by NASA grants NCC3-640 and NAG3-2738. The authors gratefully acknowledge the Phast Corporation for generously donating the PLB-Amp8, and Dr. Donghee Han for providing the PIV code.
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Hwang, W., Eaton, J.K. Creating homogeneous and isotropic turbulence without a mean flow. Exp Fluids 36, 444–454 (2004). https://doi.org/10.1007/s00348-003-0742-6
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DOI: https://doi.org/10.1007/s00348-003-0742-6