Advanced Upper Stage Propulsion Concept - The Expansion-Deflection Upper Stage

Goetz, Andreas; Hagemann, G.; Kretschmer, J.; Schwane, Richard

doi:10.2514/6.2005-3752

Cited by 11 publications

(2 citation statements)

References 3 publications

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“…The center body shape is derived from the design of a reverse- §ow nozzle with a combustion chamber integrated into the nozzle. This con¦guration leads to a conical body in the supersonic §ow region [3].…”

Section: Nozzlementioning

confidence: 99%

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Experimental study of a planar expansion-deflection nozzle

Wagner

Stark

Schlechtriem

2011

Progress in Propulsion Physics

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A planar expansion de §ection (ED) nozzle was tested in the cold- §ow P6.2 test bench at German Aerospace Center (DLR) Lampoldshausen. The comparison between design, experimental data, and numerical results at the design point of p 0 /p a = 30 shows, in general, a good agreement with slight discrepancy due to a higher expansion in the experiments. The center-body base wake closure was studied from transient pressure pro¦les (p 0 /p a = 15 25). A hysteresis was shown to exist in the transition from the open to the closed wake mode and back. For lowpressure ratios (p 0 /p a = 6, i. e., o¨-design operation), §ow separation on the center body occurred. The related separation shock was shown to interact with the opposite outer contour leading to pressure peaks.

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Section: Nozzlementioning

confidence: 99%

“…Nowadays, the ED concept is again under consideration to be applied for the upper-stage engines [3]. A shorter nozzle length could lead to mass saving at a comparable performance, especially if the combustion chamber is integrated into the nozzle.…”

Section: Introductionmentioning

confidence: 99%