DCT-TCI: Real Gas Characterization of Plasma Flow Control - An Integrated Approach.

摘要

This report presents results culminated partially from the AFOSR grant FA9550-09-1-0372 on experimental and numerical characterization of novel plasma actuators. Specifically the serpentine and multi-barrier plasma actuators are considered. The serpentine geometry demonstrated capability for the inducement of fully three dimensional vortical structures. The nature of the fluid flow inducement on a flat plate, in quiescent conditions, due to dielectric barrier discharge (DBD) plasma actuators is numerically and experimentally investigated. The three-dimensional plasma kinetic equations are solved using our in-house multi-scale ionized gas (MIG) flow code. Numerical results show detailed distribution of electron temperature and three dimensional plasma force vectors. Three-dimensional effects such as pinching and spreading the neighboring fluid are observed. The mechanisms of vorticity generation for DBD actuators are discussed. Also, the influence of applied voltage is studied. To quantify these effects stereo particle image velocimetry (PIV) is used to generate time averaged, spatially resolved measurements of the detailed flow structure. The multi-barrier plasma actuator (MBPA) is introduced to improve the effectiveness of plasma actuators. The MBPA design incorporates multiple dielectric layers and phase lagged powered electrodes into the standard design. The results of MBPA show higher induced velocities/resultant forces. For all test cases the total power delivered to the actuator is calculated and presented. These designs could be beneficial for rapid mixing of the local fluid. Experimental data for serpentine and multi-barrier plasma actuators are reported for validation purpose.