Effect of ambient pressure fluctuations on the dual-bell transition behavior

S. B. Verma, R. Stark, O. Haidn

Publikation: Beitrag in Buch/Bericht/KonferenzbandKonferenzbeitragBegutachtung

2 Zitate (Scopus)

Abstract

An experimental investigation was conducted to study the effect of ambient pressure fluctuations on dual-bell transition behavior. Back pressure fluctuations of frequency (f=0.5,1.0,1.5, 2 and 3Hz) were artificially introduced inside the HASC using three magnetic valves. The dual-bell transition behavior is found to be very sensitive to Pb fluctuations of magnitude > 20% which triggers a flip-flop phenomenon that is observed to continue as long as the fluctuations prevail. The tests show that for frequencies >2Hz, although significant fluctuations in Pw in the nozzle extension can be felt, no full transition is achieved. This behavior too is not favorable as it can lead to a delay in transition. These preliminary test results suggest that the dual-bell nozzle can present problems in real-flight operation as the launcher experiences the buffeting phase of flight. The only solution therefore lies in increasing the DB stability corridor to a value greater than the magnitude of Pb fluctuations (of 20%) so as to avoid the NPR range that will set the dual-bell into a flip-flop mode during buffeting.

OriginalspracheEnglisch
Titel48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2012
PublikationsstatusVeröffentlicht - 2012
Veranstaltung48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2012 - Atlanta, GA, USA/Vereinigte Staaten
Dauer: 30 Juli 20121 Aug. 2012

Publikationsreihe

Name48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2012

Konferenz

Konferenz48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2012
Land/GebietUSA/Vereinigte Staaten
OrtAtlanta, GA
Zeitraum30/07/121/08/12

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