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The dynamic response of a wedge separated hypersonic flow and its effects on heat transfer

The dynamic response of a wedge separated hypersonic flow and its effects on heat transfer
The dynamic response of a wedge separated hypersonic flow and its effects on heat transfer

The dynamic response of wedge separated hypersonic flow has been investigated experimentally, a with emphasis on its heat transfer effects. Tests were performed in a Mach 6.85 freestream flow, at a unit Reynolds number of 2.45x10/m. The rapidly deflecting a trailing edge flap control surface through an angle of 35 degrees in approximately 20 ms, The principal measurements made were of the model centre line chord heat transfer distributions. These separated flow structures, and liquid crystal surface thermographs. flow has effects. flow visualisation approaching 3000 with velocities complemented generated flowfield separated unsteady transfer degs./s. were with was the by of obtained instantaneous dynamic flap angles throughout The unsteady response of the separated flow was interpreted by comparing the deflection was steady the although their length In the dynamic flap a measurements at range with those determined through the separated flows in these experiments were transitional, scales were more typical of the fully laminar regime. tests there were no indications from the heat transfer significant unsteady effect on the location, or process, of transition. established criteria measurements of application of corresponding flap angles. fixed that at It were consistent flow response, However, in flow visualisation, the heat identifying a lag in its growth at The unsteady separated flow was observed to maintain the typical features of transfer steady wedge type separations during its evolution. the measurements, and moderate to high flap angles with development of Simple analytic models of the respect to the quasi-steady separation lengths. flow unsteady separated adjustment mechanisms, indicated that at high flap angles these lags in growth were significantly communication times tests made both with, concluded that to mass entrainment requirements for a growing separated flow. the unsteady maintained. pressure for was high flap angles were substantially due Locally about side plates fitted to the model. to apparent It the interaction lengths. the lags in growth at free-interaction and without, fundamental separation attributed appeared process distinct across larger based could point This only than was the on be unsteady separated flow effects the flap in these tests. There were no significant heat transfer distributions ahead of In the reattachment region there was an increase in the peak heating measured for the dynamic flap for the steady condition at separated flow induced at There also occurred an additional towards the flap trailing edge for the unsteady separated flow. deflection angle compared to the level fixed flap angle. rise in heat an identical its highest on the transfer local

University of Southampton
Smith, Andrew John Darwin
Smith, Andrew John Darwin

Smith, Andrew John Darwin (1993) The dynamic response of a wedge separated hypersonic flow and its effects on heat transfer. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

The dynamic response of wedge separated hypersonic flow has been investigated experimentally, a with emphasis on its heat transfer effects. Tests were performed in a Mach 6.85 freestream flow, at a unit Reynolds number of 2.45x10/m. The rapidly deflecting a trailing edge flap control surface through an angle of 35 degrees in approximately 20 ms, The principal measurements made were of the model centre line chord heat transfer distributions. These separated flow structures, and liquid crystal surface thermographs. flow has effects. flow visualisation approaching 3000 with velocities complemented generated flowfield separated unsteady transfer degs./s. were with was the by of obtained instantaneous dynamic flap angles throughout The unsteady response of the separated flow was interpreted by comparing the deflection was steady the although their length In the dynamic flap a measurements at range with those determined through the separated flows in these experiments were transitional, scales were more typical of the fully laminar regime. tests there were no indications from the heat transfer significant unsteady effect on the location, or process, of transition. established criteria measurements of application of corresponding flap angles. fixed that at It were consistent flow response, However, in flow visualisation, the heat identifying a lag in its growth at The unsteady separated flow was observed to maintain the typical features of transfer steady wedge type separations during its evolution. the measurements, and moderate to high flap angles with development of Simple analytic models of the respect to the quasi-steady separation lengths. flow unsteady separated adjustment mechanisms, indicated that at high flap angles these lags in growth were significantly communication times tests made both with, concluded that to mass entrainment requirements for a growing separated flow. the unsteady maintained. pressure for was high flap angles were substantially due Locally about side plates fitted to the model. to apparent It the interaction lengths. the lags in growth at free-interaction and without, fundamental separation attributed appeared process distinct across larger based could point This only than was the on be unsteady separated flow effects the flap in these tests. There were no significant heat transfer distributions ahead of In the reattachment region there was an increase in the peak heating measured for the dynamic flap for the steady condition at separated flow induced at There also occurred an additional towards the flap trailing edge for the unsteady separated flow. deflection angle compared to the level fixed flap angle. rise in heat an identical its highest on the transfer local

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Published date: 1993

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Local EPrints ID: 462338
URI: http://eprints.soton.ac.uk/id/eprint/462338
PURE UUID: db4574ab-8689-47d8-b05c-0edbe91448e2

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Date deposited: 04 Jul 2022 19:05
Last modified: 04 Jul 2022 20:38

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Author: Andrew John Darwin Smith

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