Future high-speed jet propulsion engines need sysstems to expand the exhaust gas, which must work efficiently along the whole vehicle flight path. Among the solution proposed, external expansion systems show the property of adapting themselves to the ambient pressure, allowing better performance than conventional nozzles. Unfortunately, for adaptation they have to interact with the external air stream, and this interaction can signifiantly reduce performance. This paper shows how large this effect can be for a generic external expansion nozzle configuration. The analysis is carried out ny solving numerically the Euler equations by a methodology based on the lambda-scheme and on the fitting of the flow discontinuities.

Numerical Analysis of the Slipstream Effect in External Expansion Nozzles

NASUTI, Francesco;ONOFRI, Marcello
1999

Abstract

Future high-speed jet propulsion engines need sysstems to expand the exhaust gas, which must work efficiently along the whole vehicle flight path. Among the solution proposed, external expansion systems show the property of adapting themselves to the ambient pressure, allowing better performance than conventional nozzles. Unfortunately, for adaptation they have to interact with the external air stream, and this interaction can signifiantly reduce performance. This paper shows how large this effect can be for a generic external expansion nozzle configuration. The analysis is carried out ny solving numerically the Euler equations by a methodology based on the lambda-scheme and on the fitting of the flow discontinuities.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/243273
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