Dual bell nozzle permits two different operating modes which provide higher performance than conventional bell nozzles when applied to rocket engines operating in a varying ambient pressure environment. The most critical aspects of dual bell nozzles are the possible side loads that may occur during the separated flow operations and, especially, during the transition between the two operating modes. The present study addresses the subscale and full-scale nozzles by a numerical analysis of the transition behavior for varying Reynolds number. The results are of particular interest to extend the value of data measured in subscale experiments to full-scale applications.
Size Effects on the Transition in Dual-Bell Nozzles / E., Martelli; Nasuti, Francesco; Onofri, Marcello. - (2004). (Intervento presentato al convegno 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit tenutosi a Fort Lauderdale, Florida, USA nel 11-14 luglio 2004).
Size Effects on the Transition in Dual-Bell Nozzles
NASUTI, Francesco;ONOFRI, Marcello
2004
Abstract
Dual bell nozzle permits two different operating modes which provide higher performance than conventional bell nozzles when applied to rocket engines operating in a varying ambient pressure environment. The most critical aspects of dual bell nozzles are the possible side loads that may occur during the separated flow operations and, especially, during the transition between the two operating modes. The present study addresses the subscale and full-scale nozzles by a numerical analysis of the transition behavior for varying Reynolds number. The results are of particular interest to extend the value of data measured in subscale experiments to full-scale applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.