PIV Study on Flow Characteristics of Periodic-Pulsed Dielectric Barrier-Discharge over A Conical Forebody
The momentum-transfer performance of a plasma actuator over a 20° conical fore-body is studied experimentally for the effects of periodic pulse in the absence of external flow. A two-dimensional particle image velocimetry is used to measure cross flow velocity field around the body in atmospheric air. The timeaveraged spatial and temporal distributions of induced maximum cross flow velocity and maximum magnitude of axial-vorticity in the neighborhood of the body are investigated. Under pulsed actuation the unsteadiness of the induced flow is significant in the flow physics, therefore, besides the ensemble-averages, phase-lockedaverages are examined. Experimental results indicate that the main mechanism of momentum transfer under periodic pulsed actuation is the formation of strong discrete vortices, rather than the gas acceleration. The phase-locked averaged maximum cross flow velocity and maximum magnitude of axial vorticity induced by periodic-pulsed discharge remain non-zero even after the actuator is turned off. The results reveal the effect of flow hysteresis. The input power can be saved by using periodic pulsed actuation that is able to utilize the flow hysteresis.
PIV technique conical forefody plasma periodic-pulsed discharge
Zheng Borui Gao Chao Li Yibin Wang Jianlei Liu Feng Luo Shijun
National Key Laboratory of Science and Technology on Aerodynamic Design and Research,Northwestern Po University of California, Irvine,CA 92697-3975 University of California, Irvine, CA 92697-3975
国际会议
2010 Asia-Pacific International Symposium on Aerospace Technology(2010 亚太航空航天技术研讨会 APISAT 2010)
西安
英文
223-227
2010-09-01（万方平台首次上网日期，不代表论文的发表时间）