Fundamental Physics and Practical Applications of Electromagnetic Local Flow Control in High Speed Flows (Rutgers)

摘要

An experimental research program conducted at the University of Illinois examined fundamentals of energy deposition processes, as well as, electromagnetic local flow control (ELFC) in high speed applications. A new ELFC device that utilizes a microwave co-axial resonator (MCAR) for pulsed frequencies between 400 Hz to 10kHz was characterized for pressures ranging from 0.05 atm to 1 atm. Additionally the effect of reduced pressure and multiple wavelengths was studied for the plasmas formed from laser induced optical breakdown. The application of ELFC as a means of active flow control for the shear layer above a supersonic cavity in the open configuration was investigated at a free stream Mach number of 1.4. Analysis of phase averaged schlieren images and 2D velocity field characterized the formation and growth of a coherent large-scale structure in the wake of the generated disturbance. Also the application of ELFC in a sonic underexpanded jet injected normally into a Mach 2.25 crossflow was shown to not only perturb the shock wave interaction, but also induced the formation of vortices, which may lead to improved mixing of the jet with the freestream.