Non-Thermal Control of Shock-Wave Induced Boundary Layer Separation using Magneto-Hydrodynamics Conference Paper uri icon

abstract

  • This study investigates the non-thermal impact of a magnetically driven surface discharges ("snow-plough" arc) on shock induced boundary layer separation. The surface plasma column appears as a transverse "arc" between two diverging electrodes which is driven by j × B force so that it sweeps the gas near the surface either in the downstream direction or in the upstream direction. Initial results have been reported previously using a Mach 2.8 indraft wind tunnel show that upstream forcing of boundary layer induced separation in the interaction zone of an oblique shock, generated by a 10 degree wedge, with turbulent boundary layer. This interaction, of oblique shock with boundary layer, is shown not to induce a recirculation bubble or separation in the boundary layer without plasma actuation. A 14 degree wedge is used to generate an oblique shock that impinged on the turbulent boundary layer generating a separation zone and recirculation in the flow. Downstream plasma actuation, against the recirculating flow, in such a case resulted in modified geometry of interaction zone as seen in Schlieren images. Various new configurations of plasma - flow interaction are developed, mainly applying magnetic field at an angle such that plasma column forces the core flow into the boundary layer increasing the momentum and thus avoiding separation.

author list (cited authors)

  • Kalra, C., Zaidi, S., Alderman, B., & Miles, R.

publication date

  • January 1, 2007 11:11 AM