Repository: Freie Universit├Ąt Berlin, Math Department

Dynamic Evolution of a Transient Supersonic Trailing Jet Induced by a Strong Incident Shock Wave

Haghdoost, M.R. and Edgington-Mitchell, D. and Nadolski, M. and Klein, R. and Oberleithner, K. (2020) Dynamic Evolution of a Transient Supersonic Trailing Jet Induced by a Strong Incident Shock Wave. Phys. Rev. Fluids, 5 (7).

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Official URL: https://doi.org/10.1103/PhysRevFluids.5.073401

Abstract

The dynamic evolution of a highly underexpanded transient supersonic jet at the exit of a pulse detonation engine is investigated via high-resolution time-resolved schlieren and numerical simulations. Experimental evidence is provided for the presence of a second triple shock configuration along with a shocklet between the reflected shock and the slipstream, which has no analog in a steady-state underexpanded jet. A pseudo-steady model is developed, which allows for the determination of the postshock flow condition for a transient propagating oblique shock. This model is applied to the numerical simulations to reveal the mechanism leading to the formation of the second triple point. Accordingly, the formation of the triple point is initiated by the transient motion of the reflected shock, which is induced by the convection of the vortex ring. While the vortex ring embedded shock move essentially as a translating strong oblique shock, the reflected shock is rotating towards its steady-state position. This results in a pressure discontinuity that must be resolved by the formation of a shocklet.

Item Type:Article
Subjects:Mathematical and Computer Sciences > Mathematics > Applied Mathematics
Divisions:Department of Mathematics and Computer Science > Institute of Mathematics > Geophysical Fluid Dynamics Group
ID Code:2498
Deposited By: Ulrike Eickers
Deposited On:18 Feb 2021 10:19
Last Modified:18 Feb 2021 10:19

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