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12-02-16 14:15 Age: 2 years

By:  Jesse Little (Ass. Prof., Dep. of Aerospace and Mech. Eng., Univ. of Arizona)

Nanosecond Pulse Surface Discharges for Control of Turbulent Shear Flows



Thermal or thermoacoustic perturbations initiated by pulsed plasmas and lasers have demonstrated impressive control authority in various high-speed turbulent shear flows yet questions on fundamental physics and scaling remain unanswered. The control mechanism is believed to stem from a thermal effect connected to the energy deposition delivered by actuation. This control mechanism is quite different from most devices which rely on periodic or pulsed momentum addition, including the more widely-studied ac driven dielectric barrier discharge. This talk will review the state of the art on thermal perturbations for control of turbulent shear flows and offer some insight into the parameters governing their success. Specific focus will be placed on the characterization and use of nanosecond pulse discharges for controlling turbulent mixing layers and flow downstream of a backward-facing step.


12-02-16 14:15 Age: 2 years

By:  Jesse Little (Ass. Prof., Dep. of Aerospace and Mech. Eng., Univ. of Arizona)

Nanosecond Pulse Surface Discharges for Control of Turbulent Shear Flows



Thermal or thermoacoustic perturbations initiated by pulsed plasmas and lasers have demonstrated impressive control authority in various high-speed turbulent shear flows yet questions on fundamental physics and scaling remain unanswered. The control mechanism is believed to stem from a thermal effect connected to the energy deposition delivered by actuation. This control mechanism is quite different from most devices which rely on periodic or pulsed momentum addition, including the more widely-studied ac driven dielectric barrier discharge. This talk will review the state of the art on thermal perturbations for control of turbulent shear flows and offer some insight into the parameters governing their success. Specific focus will be placed on the characterization and use of nanosecond pulse discharges for controlling turbulent mixing layers and flow downstream of a backward-facing step.


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