Inverse feedback mechanism in self-oscillations in flow of an underexpanded supersonic jet against a planar obstacle

Glaznev, V. N.

doi:10.1007/bf00851553

Cited by 2 publications

(2 citation statements)

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“…Oscillations at a discrete tone in various cases of impingement of an underexpanded supersonic jet onto bounded and unbounded obstacles were considered in [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Two mechanisms of the emergence of oscillations were proposed: the mass-flow-rate mechanism with an internal feedback [1,[11][12][13][14] and the mechanism with an external feedback through the gas surrounding the jet [2-5, 8, 9].…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of self-oscillations in a supersonic jet impact onto an obstacle 1. Obstacle with a spike

Киселев

Zaikovskii

2014

J Appl Mech Tech Phy

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Results of numerical simulations and experimental investigations of self-oscillations arising in the case of impingement of an overexpanded or underexpanded jet onto an obstacle with a spike are reported. The mechanisms of the emergence and maintaining of self-oscillations for overexpanded and underexpanded jets are elucidated. It is demonstrated that self-oscillations are caused by disturbances in a supersonic jet, which induce mass transfer between the supersonic flow and the region between the shock wave and the obstacle. The feedback is ensured by acoustic waves generated by the radial jet on the obstacle. These waves propagate in the gas surrounding the jet, impinge onto the nozzle exit, and initiate disturbances of the supersonic jet parameters. In the overexpanded jet, these disturbances penetrate into the jet core, where they are amplified in oblique shock waves.

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Section: Introductionmentioning

confidence: 99%

“…The internal acoustic relationship is ensured by compression and expansion waves propagating between the shock wave and the obstacle. The external feedback mechanism proposed in [8,9] acoustic model [2,3]. In this case, the feedback is provided by acoustic disturbances generated by the radial jet spreading over the obstacle.…”

Section: Introductionmentioning

confidence: 99%