What is it about?

Mixing performance of supersonic ejectors is limited by the high convective Mach numbers at which they operate. The current study investigates the effect of streamwise pulsed injections to oscillate the primary supersonic jet to induce a bulk mixing in the mixing chamber. It is observed that the mixing performance in the high Mach number regions of the mixing chamber is significantly improved without causing performance penalties. Detailed studies on the flow unsteadiness and mixing characteristics are also presented.

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Why is it important?

The study features a fluidic actuation technique which does not cause any obstruction in the flow field. As a result, this flow control strategy has very less performance penalties in terms of entrainment ratio or compression ratio. In addition, the pulsation frequency can be varied to achieve dynamic control.

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This page is a summary of: An active mixing enhancement technique in supersonic ejectors using pulsed streamwise injections, Physics of Fluids, July 2023, American Institute of Physics,
DOI: 10.1063/5.0157019.
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