Control of shock-wave boundary layer interaction using steady micro-jets

Verma, SB and Manisankar, C and Akshara, P (2014) Control of shock-wave boundary layer interaction using steady micro-jets. Shock Waves. pp. 1-9.

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An experimental investigation was conducted to control the amplitude of shock unsteadiness associated with the interaction induced by a cylindrical protuberance on a flat plate in a Mach 2.18 flow. The control was applied in the form of an array of steady micro air-jets of different configurations with variation in pitch (β) and skew angle (α) of the jets. The effect of air-jet supply pressure on control was also studied. Each of the micro-jet configurations was placed 20 boundary layer thicknesses upstream of the leading edge of the cylinder. The overall interaction is seen to get modified for all control configurations and shows a reduction in both separation- and bow-shock strengths and in triple-point height. A significant reduction in the peak rms value is also observed in the intermittent region of separation for each case. For 90o pitched jets placed in a zig-zag configuration, good control effectiveness is achieved at control pressures similar to the stagnation pressure of the freestream. At higher control pressures, however, their obstruction component increases and if these jets are not spaced sufficiently far apart, the effectiveness of their control begins to drop due to the beginning of spanwise jet-to-jet interaction. On the other hand, pitching or skewing the jets to 45o reduces the obstruction component considerably which at lower control pressures, shows lower effectiveness. But at higher control pressure, the effectiveness of these configurations continues to increase unlike the 90o pitched jets.

Item Type: Article
Additional Information: Copyright to this article belongs to M/s. Springer-Verlag
Uncontrolled Keywords: Flow control;Steady micro-jets;Flow separation;Shock Unsteadiness
Subjects: AERONAUTICS > Aeronautics (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 23 Jul 2015 04:18
Last Modified: 23 Jul 2015 04:18

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