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- W184298972 abstract "nnnnn The flowfield in the nozzle exhaust of a vertical strut injectednscramjet is studied in this thesis with emphasis on the prediction ofnthrust. An analytical model based on the physical processes expected tondominate the flow structure is presented. The distinctive feature ofnthis model is the interaction between the developing vertical fuel jetnand the horizontal swept expansion fan from the convex corner of thennozzle exhaust. This feature is noted to be similar to a sweptnexpansion fan-boundary layer interaction. n nnnnn Both the vertical strut injected nozzle exhaust flow and the sweptnexpansion fan-boundary layer interaction are modelled in this thesis tonconsist of two separate processes. The first is the expansion andnturning of the vertical fuel jet or the supersonic boundary layer by answept expansion. It was found that during this interaction the jet ornlayer are turned more than the surrounding stream due to their Mach no.ndeficit relative to this stream.n n nnnnn The second process is the constraint of this jet or layernover-turning by the scramjet thrust surface or the boundary layerninteraction expansion wedge. It is expected that the jet or layer willnbulge near their respective constraining surfaces, deflectingnsurrounding streamlines, and hence incurring a pressure rise. This isnexpected to be the dominant thrust producing mechanism in a scramjet ofnthis configuration.n n nnnnn A quantitative analytical procedure based on these processes isnpresented to calculate the pressure distribution on the scramjet thrustnsurface or the boundary layer interaction expansion wedge. Thenintegration of this pressure distribution supplies a first ordernestimate of the thrust produced in a vertical strut injected scramjet.n n nnnnn To validate the flow model a series of experiments was conductednin a supersonic blowdown tunnel facility at the Mechanical EngineeringnDepartment, Queensland University, on swept expansion fan-boundary layerninteractions. The measured pressure distributions on the expansionnwedge in these experiments are presented in this thesis. Thesendistributions correlate well with results produced using the modelndescribed. Given this correlation, the model is considered to be annaccurate representation of the flow structure present in a sweptnexpansion-boundary layer interaction. It is also considered to be annaccurate model of the dominant feature in a vertical strut injectednscramjet nozzle exhaust flow.n" @default.
- W184298972 created "2016-06-24" @default.
- W184298972 creator A5039745260 @default.
- W184298972 date "1988-01-01" @default.
- W184298972 modified "2023-09-26" @default.
- W184298972 title "Analysis of a scramjet nozzle exhaust : an analytical study of the flow field in the nozzle exhaust of a vertical strut injected scramjet for the purposes of thrust calculation" @default.
- W184298972 hasPublicationYear "1988" @default.
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