Turbulent flow separation in over-expanded rocket nozzles is investigated numerically in a sub-scale parabolic nozzle fed with cold nitrogen. Depending upon the feeding to ambient pressure ratio either a free shock separation or a restricted shock separation is computed, with a significant hysteresis between these two flow regimes. This hysteresis was also found in experimental tests with the same nozzle geometry. The present study is mainly focused on the transition between the two shock separation patterns. The analysis of the numerical solutions aims to provide clues for the explanation of the hysteresis cycle.
Numerical calculation of FSS/RSS transition in highly overexpanded rocket nozzle flows / Emanuele, Martelli; Nasuti, Francesco; Onofri, Marcello. - In: SHOCK WAVES. - ISSN 0938-1287. - STAMPA. - 20:2(2010), pp. 139-146. [10.1007/s00193-009-0244-4]
Numerical calculation of FSS/RSS transition in highly overexpanded rocket nozzle flows
NASUTI, Francesco;ONOFRI, Marcello
2010
Abstract
Turbulent flow separation in over-expanded rocket nozzles is investigated numerically in a sub-scale parabolic nozzle fed with cold nitrogen. Depending upon the feeding to ambient pressure ratio either a free shock separation or a restricted shock separation is computed, with a significant hysteresis between these two flow regimes. This hysteresis was also found in experimental tests with the same nozzle geometry. The present study is mainly focused on the transition between the two shock separation patterns. The analysis of the numerical solutions aims to provide clues for the explanation of the hysteresis cycle.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
