Abstract
The dual bell nozzle is a concept of altitude adaptive nozzles. The flow adapts to the altitude by separation at the wall inflection at low altitude, and full flowing at high altitude. To understand the phenomenology of the flow by the transition from sea-level mode to high altitude mode, a series of tests have been made at the cold flow test bench P6.2 at DLR Lampoldshausen. A dual bell nozzle have been successively shorten and driven in the same conditions for each length. Hence it was possible to observe the flow in the vicinity of the wall inflection using Schlieren optics. Furthermore this study yields the influence of the length ratio between basis and extension on the transition conditions.
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Abbreviations
- NPR:
-
P 0/P a, nozzle pressure ratio ( − )
- CP:
-
constant pressure
- R th :
-
nozzle throat radius (m)
- L base :
-
base nozzle length (m)
- L ext :
-
extension nozzle length (m)
- L′:
-
L ext/L tot, relative length ( − )
- α :
-
wall inflection angle (◦)
- \({\epsilon}\) :
-
Area ratio ( − )
References
Foster, C., Cowles, F.: Experimental study of gas-flow separation in overexpanded exhaust nozzles for rocket motors. JPL progress report no. 4-103 (1949)
Horn, M., Fisher, S.: Dual-bell altitude compensating nozzles, NASA-N94-23057 (1994)
Immich, H., Caporicci, M.: Status of the FESTIP Rocket Propulsion Technology Programme, AIAA, pp. 97–331 (1997)
Frey M., Hagemann G.: Critical assessment of dual-bell nozzles. J. Propuls. Power 15(1), 137–143 (1999)
Hagemann, G., Terhardt, M., Haeseler, D., Frey, M.: Experimental and analytical design verification of the dual-bell concept. AIAA, pp. 2000–3778 (2000)
Perigo, D., Schwane, R., Wong, H.: A numerical comparison of the flow in conventional dual bell nozzles in the presence of an unsteady external pressure environment. AIAA, pp. 2003–4731 (2003)
Karl, S., Hannemann, K.: Numerical investigation of transient flow phenomena in dual-bell nozzles (2005)
Nasuti F., Onofri M., Martelli E.: Role of wall shape on the transition in axisymmetric dual-bell nozzles. J. Propuls. Power 21, 2 (2005)
Stark, R., Boehm, C., Haidn, O., Zimmermann, H.: Cold flow testing of dual-bell nozzles in altitude simualtion chambers. In: European Conference for Aerospace Sciences (EUCASS) (2005)
Nuernberger-Genin, C., Stark, R.: Experimental study of dual bell nozzles. In: European Conference for Aerospace Sciences (2007)
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Communicated by A. Hadjadj.
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Nürnberger-Genin, C., Stark, R. Flow transition in dual bell nozzles. Shock Waves 19, 265–270 (2009). https://doi.org/10.1007/s00193-008-0176-4
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DOI: https://doi.org/10.1007/s00193-008-0176-4