In case of high overexpansion, the exhaust jet of the supersonic nozzle of rocket engines separates from nozzle wall because of the large adverse pressure gradient. At the same time, to match the pressure of the separated flow region, an oblique shock is generated which evolves through the supersonic jet starting approximately from the separation point. This shock reflects oil the nozzle axis with a Mach reflection. Thus a peculiar Mach reflection takes place whose features depend on the upstream flow conditions, which are usually not uniform. A simplified model is presented which is a first step to predict the expected features of Mach reflection depending oil the nozzle shape and oil the position of the separation point along the divergent section of the nozzle.
A model to predict the Mach reflection of the separation shock in rocket nozzles / Nasuti, Francesco; Onofri, Marcello. - 2:(2009), pp. 1093-1098. (Intervento presentato al convegno 26th International Symposium on Shock Waves tenutosi a Gottingen, GERMANY nel JUL 15-20, 2007) [10.1007/978-3-540-85181-3_48].
A model to predict the Mach reflection of the separation shock in rocket nozzles
NASUTI, Francesco;ONOFRI, Marcello
2009
Abstract
In case of high overexpansion, the exhaust jet of the supersonic nozzle of rocket engines separates from nozzle wall because of the large adverse pressure gradient. At the same time, to match the pressure of the separated flow region, an oblique shock is generated which evolves through the supersonic jet starting approximately from the separation point. This shock reflects oil the nozzle axis with a Mach reflection. Thus a peculiar Mach reflection takes place whose features depend on the upstream flow conditions, which are usually not uniform. A simplified model is presented which is a first step to predict the expected features of Mach reflection depending oil the nozzle shape and oil the position of the separation point along the divergent section of the nozzle.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
