Studies of the transient flows in high enthalpy shock tunnels

Chue, Randy; Eitelberg, G.

doi:10.1007/s003480050253

Cited by 39 publications

(11 citation statements)

References 5 publications

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“…A number of vortex structures are generated in the driver gas boundary layer as the bifurcated reflected shock moves upstream (frames 3280 to 3440 µs). The motion caused by this vorticity is in a direction as to stop the jetting generated by the shock foot, as similarly observed by Chue and Itoh (1995); Chue and Eitelberg (1998). This is a tailored contact surface interaction and thus the bulk of the driver gas does not continue to move downstream immediately following interaction with the reflected shock.…”

Section: µSsupporting

confidence: 60%

“…A particle trap arrangement on the shock tube centreline was investigated by Chue and Eitelberg (1998). Modification of such a device to incorporate a gas bleed has better prospects for delaying contamination at the conditions we have studied.…”

Section: Discussionmentioning

confidence: 99%

“…To improve the understanding of key shock tunnel processes such as contamination, axisymmetric numerical simulations have been used (Sharma and Wilson, 1995;Wilson, 1995;Chue and Eitelberg, 1998); however, previous axisymmetric simulations of reflected shock tunnels have generally modelled only particular parts of a facility. Typically the very end of the shock tube and the nozzle have been modelled using inflow conditions derived from empirical relations (Sharma and Wilson, 1995;Wilson, 1995).…”

Section: Introductionmentioning

confidence: 99%

“…Axisymmetric simulations have also aimed specifically at modelling the interaction of the reflected shock with the boundary layer, for the purpose of interpreting its effect on flow contamination by the driver gas (Wilson, 1995;Badcock, 1992). Chue and Eitelberg (1998) noted the generation of vorticity in the driver gas interface during its interaction with the reflected shock; however, the process was not followed through its complete evolution and it was concluded that this vorticity would act to postpone contamination.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of a complete reflected shock tunnel showing a vortex mechanism for flow contamination

2006

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Abstract. Simulations of a complete reflected shock tunnel facility have been performed with the aim of providing a better understanding of the flow through these facilities. In particular, the analysis is focused on the premature contamination of the test flow with the driver gas. The axisymmetric simulations model the full geometry of the shock tunnel and incorporate an iris-based model of the primary diaphragm rupture mechanics, an ideal secondary diaphragm and account for turbulence in the shock tube boundary layer with the Baldwin-Lomax eddy viscosity model. Two operating conditions were examined: one resulting in an over-tailored mode of operation and the other resulting in approximately tailored operation. The accuracy of the simulations is assessed through comparison with experimental measurements of static pressure, pitot pressure and stagnation temperature. It is shown that the widely-accepted driver gas contamination mechanism in which driver gas 'jets' along the walls through action of the bifurcated foot of the reflected shock, does not directly transport the driver gas to the nozzle at these conditions. Instead, driver gas laden vortices are generated by the bifurcated reflected shock. These vortices prevent jetting of the driver gas along the walls and convect driver gas away from the shock tube wall and downstream into the nozzle. Additional vorticity generated by the interaction of the reflected shock and the contact surface enhances the process in the over-tailored case. However, the basic mechanism appears to operate in a similar way for both the over-tailored and the approximately tailored conditions. 2 R.

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Section: µSsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of a complete reflected shock tunnel showing a vortex mechanism for flow contamination

2006

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“…This change was made to test whether the end-wall geometry influenced the conditions in the nozzle reservoir. Previous work shows that the interaction of the reflected shock with the boundary layer on the shock tube wall can generate recirculating flow [2], and that the interaction of the reflected shock with the contact surface separating the test gas from the driver gas can cause premature jetting of the driver gas into the test gas [10]. Either of these two effects could generate large variations in temperature and composition in the flow entering the nozzle.…”

Section: Methodsmentioning

confidence: 99%