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Active Control of High Reynolds Number Supersonic Jets Using Plasma Actuators

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Technical Report,01 Mar 2007,30 Nov 2009

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Ohio State University Research Foundation Columbus United States

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Control of jets with Localized Arc Filament Plasma Actuators LAFPAs is conducted over a wide range jet Mach numbers 0.9 to 1.65. The exit diameter is 2.54 em for all cases and eight LAFP As were used. The jet spreading is strongly dependent on duty cycle, forcing frequency, and azimuthal modes. The performance of LAFPAs for jet spreading is investigated using PlY. There is an optimum duty cycle, producing maximum jet spreading, for each forcing frequency. A relationship between the optimum duty cycle and forcing frequency is determined experimentally. The effect of forcing frequency is investigated for a wide range of forcing Strouhal numbers StfDU ranging from 0.09 to 3.0. The azimuthal modesm investigated are m 0 - 3, I, 2, and 4. The performance of LAFPAs does also strongly depend on the stagnation temperature of the jet. The effects of stagnation temperature are investigated for 1.0, 1.4, and 2.0 times the ambient temperature. Results show that the jet spreading is greatest at about St0.3 for most azimuthal modes. The most and least effective azimuthal modes for mixing enhancement are m I and 4, respectively. The results in the heated jet show that the effects of forcing increase with increasing stagnation temperature.

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