Abstract
This chapter discusses turbulent structures in a supersonic jet-mixing layer interaction. Radial pneumatic injection is proved an efficient means of mixing enhancement in turbulent supersonic jets. Such control techniques are suitable for aeronautic applications, because aircraft engines provide pneumatic sources for flow control. Radial pneumatic injection into a supersonic jet is however poorly documented, compared with impinging jet studies for example. This chapter experimentally analyzes the interaction between a supersonic mixing layer and a small control jet. The experimental study is performed on a primary, ideally expanded, supersonic jet surrounded by a subsonic co-flow. The main jet is supplied by high pressure air tanks, while the co-flow is entrained. The interaction between the supersonic mixing layer and the small control jet results in a flapping motion of the control jet, a distortion of the mixing layer, and an increase of the Reynolds stresses. The increase in the turbulence quantities is mainly contained in large-scale, well-organized coherent structures that are generated by the interaction. Characteristics of these structures are analyzed through linear stochastic estimation strategies.
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