Giovani, lavoro e partecipazione: concetti e dinamiche

Martelli, Alessandro

doi:10.3280/sl2014-136013

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…In Europe, the FESTIP research group realized a feasibility and performance analysis [1,4]. Various parametrical studies have also been realized to understand the §ow phenomena and optimize the contour design [5,6].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of dual bell nozzle flow

Génin

Stark

Haidn

et al. 2013

Progress in Flight Physics

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The dual bell is a nozzle concept for altitude adaption. The §ow separates at the contour in §ection in sea level mode in a mainly controlled and symmetrical way, reducing the side load generation and increasing the thrust. The transition to altitude mode is reached when the §ow suddenly attaches to the extension for an improved altitude thrust. The conditions of this transition and its evolution are the key for the study of dual bell nozzles. For a better understanding of the §ow behavior, a two-dimensional (2D) subscale dual bell model has been designed and tested at the German Aerospace Center (DLR). The tests were divided into two campaigns and performed under cold and hot §ow conditions. The evolution of the shock system at the in §ection during the transition was observed using schlieren optics. The planar nozzle was tested under various conditions in pressure and temperature. Both test campaigns have been recalculated in cooperation with Astrium. Numerical and experimental results are presented.

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Section: Introductionmentioning

confidence: 99%