Supersonic Free Jet Control with Microjets

The effectiveness of microjets as active controls for controlling the mixing characteristics of Mach 2 axi-symmetric jet has been investigated experimentally. The microjets employed were sonic jets under different levels of under-expansion. Two diametrically opposite microjets and four microjets located on orthogonal diameters were investigated in the present study. In addition to a level of under-expansion the radial locations of the microjets were also studied. The results show that the microjets can serve as active controls for supersonic jets. The microjets were found to be most effective when the jet is almost correctly expanded.

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