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A new compact active turbulence generator is developed, tested, andcharacterized, which extends the capabilities of such generators used inturbulent premixed combustion research. The generator is composed of two bladesthat resemble the shape of two bow-ties. Hot-wire anemometry and high-speedimaging are performed to characterize the non-reacting flow produced by thegenerator and the blades dynamics, respectively. Two mean bulk flow velocitiesof 5.0 and 7.0 m/s are examined. For comparison purposes, in addition to thedeveloped generator, tests are also performed for a free jet as well as one andtwo perforated plates. The results show that the centerline root mean squarevelocity fluctuations can become about 1.8~m/s, which is several folds largerthan that in the literature for reacting flows generated by active grids. Forthe newly developed device, the power-law decay of the one-dimensional kineticenergy is -1.0 and -1.3 for the mean bulk flow velocities of 5.0 and 7.0 m/s,respectively. The normalized energy dissipation rate is smallest for the newlydeveloped device, while the energy dissipation rate is the largest. Thespectral analysis of the velocity data does not show dominant frequencies equalto the blades rotation frequencies; and, the one dimensional kinetic energy anddissipation spectra follow -5/3 and 1/3 power-law relations. It is shown that,the small eddies produced by the newly developed device dissipate the turbulentkinetic energy faster than those corresponding to the rest of the testedturbulence generators.

A new compact active turbulence generator for premixed combustion: Non-reacting flow characteristics