Transient Flow Patterns of Multiple Plasma Synthetic Jets Under Different Ambient Pressures
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- 所属单位：能源与动力学院
- 发表刊物：FLOW TURBULENCE AND COMBUSTION
- 关键字：Plasma synthetic jet Transient jet boundary Flowfield similarity
- 摘要：The plasma synthetic jet is a new active flow control technique, which has great potentials for supersonic flow control A plasma synthetic jet actuator (PSJA) for supersonic flow control which operates under low ambient pressure is designed In order to explore the transient jet flowfield, high-speed Schlieren and electronic measurement systems are utilized to test the single-shot operating characteristics of the actuator under two ambient pressure conditions. The evolution of the jet boundary, which depicts the transient jet flowfield and can be used to estimate the flow control capability, is captured. It is found that the ambient pressure is the primary reason to affect the arc energy deposition, which directly determines the velocity of blast wave and jet front. In addition, the flow patterns of PSJA under various ambient pressures show some similarities. The jet evolution can be divided into three stages, i.e. pressure dominant stage, the inertia dominant stage and vortex ring dominant stage. During the pressure dominant stage, the PSJA could be treated as jet. For the inertia dominant stage, the Froude number decreases from 2263.82 to 21.73, indicating the inertia effect gets weakened with an intensified buoyancy effect, but the inertia effect still holds the dominant position, and this stage may be considered as the end mark of the injection process. As for the vortex ring dominant stage, large scale vortex ring becomes significant and the jet front velocity is very low but with apparent fluctuation.
- ISSN号：1386-6184
- 是否译文：否
- 发表时间：2018-10-01
- 合写作者：Zhang, Yu-chao,F70206627,孙姝,何小明,Cheng, Lin,Zhuang, Yi
- 通讯作者：谭慧俊
- 发表时间：2018-10-01
