The flow in a duct following a sudden change in section is described herein. Sonic flow through a convergent nozzle expands into a larger cross section to produce a mixed supersonic flow, and a low base pressure in the upstream corners. Under certain pressure conditions, oscillations occur in the duct and excessive externally generated noise results. These self-excited oscillations are caused by a boundary-layer/shock-wave interaction, and can exist in both circular and rectangular ducts. Many types of oscillations have been observed in different test arrangements, and a complete description of the flow is given. (DePo)
Oscillations of the supersonic flow downstream of an abrupt increase in duct cross section
Schwingungen von Ueberschallstroemungen bei ploetzlichen Aenderungen des Kanalquerschnittes
AIAA Journal ; 18 , 4 ; 394-395
1980
2 Seiten, 4 Bilder, 4 Quellen
Aufsatz (Zeitschrift)
Englisch
Oscillations of the supersonic flow downstream of an abrupt inccrease in duct cross-section
GWLB - Gottfried Wilhelm Leibniz Bibliothek | 1978
|Sonic flow through an abrupt change in cross-section
Tema Archiv | 1984
|