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- W2049204600 abstract "A coupled numerical-experimental investigation studying the applicability of a Sliding Doors variable geometry inlet starting mechanism for a 2D SCRAMjet inlet at Mach 6 has been undertaken. Door opening speeds ranging from 3 to 20ms repeatedly produced started inlet conditions when tested within the TUSQ Low-Enthalpy Wind Tunnel. Transient flow during door retraction was captured both quantitatively and qualitatively via surface pressure measurements and Schlieren visualization techniques. A blunt wedge protruding upstream into the combustor from the rear of the model was also installed, simulating a large pressure rise within the combustor at the centerline. Inlet unstart was encountered for a wedge position protruding 7mm upstream into the combustor, with door opening speeds as low as approximately 1ms were seen to have no visible effect on inlet startability. A viscous, transient, time accurate numerical investigation was conducted, recreating the experimental conditions by solving the Reynolds-Averaged Navier-Stokes equations. These simulations provide insight into pockets of the flowfield for which optical access was not available, as well as also allowing faster door opening speeds to be employed which were not mechanically possible in the tunnel. It was found that even extreme door opening speeds of 0.1ms were not able to start the more aggressive forward wedge positions. Interactions between shock structures around the leading edge of the wedge and the boundary layer at the rear of the combustor were seen to supersede the positive effects of employing unsteady effects." @default.
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- W2049204600 date "2014-06-13" @default.
- W2049204600 modified "2023-09-25" @default.
- W2049204600 title "Investigation into the Flow Physics of Hypersonic Variable Geometry Inlet Starting" @default.
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- W2049204600 doi "https://doi.org/10.2514/6.2014-3230" @default.
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