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Vortex Formation, Flow Separation, Pulse Jet, Unsteady and Steady jet, Mixing Enhancement, Mass Flow Rate

A conceptual design and numerical model of Micro Pulse Jet has been developed to investigate the flow separation. This valve is designed to generate the stream line vortices to suppress the flow separation by enhancing the mixing of the flows between free stream and separated flow of the boundary layer through pitched jet orifice of very small width. This paper describes not only the conceptual modeling of Micro Pulse Jet but also presenting the numerical analysis and results of steady and unsteady pulse of micro jet. The unsteady pulse of the valve is simulated by the periodic inlet boundary condition through mathematical model. A 2-D ramp with 20 degrees divergence is selected. The divergence of the lower wall of the ramp is large enough to produce a strong adverse pressure gradient causing the boundary layer to separate. A jet orifice is introduced at the upstream of the divergent portion of the ramp and the effect of steady and unsteady jet is analyzed. The main inlet boundary condition is almost of 0.2 Mach. The jet amplitude is characterized by the velocity ratio (Vj/V∞) in between 0 to 5 and the jet pulse frequency is varying between 0 to 100 Hz. A comparison between the steady and unsteady Micro Pulse jet is also done, which indicates the mass flow requirement for pulse micro jet is reduced significantly as compare to the steady jet for the flow separation control.