Experimental measurements of an expansion deflection nozzle in open wake mode

N. V. Taylor*, Tetsuya Sato

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Expansion Deflection nozzles present an attractive proposition as a replacement for conventional nozzles on launch vehicles, due to their reduced length, and altitude compensating capability. However, it has long been speculated that they suffer in the latter regard due to aspiration of the low speed flow region inside the nozzle by the supersonic jet surrounding it. This effect is investigated in this paper by direct experimental measurement of base pressures, and found to have little effect on the base pressure of the nozzle within the range of operating conditions investigated. Wall pressures were also used to calculate the efficiency of the altitude compensation within the nozzle, which was found to be between 87 and 100% for the three operating pressure ratios examined. This represents a significant improvement over conventional nozzle performance, and further conformation that wake pressures are indeed close to ambient.

Original languageEnglish
Pages (from-to)377-386
Number of pages10
JournalJBIS - Journal of the British Interplanetary Society
Issue number10
Publication statusPublished - 2007 Oct


  • Expansion deflection
  • Experimental aerodynamics
  • Nozzles
  • Rocket propulsion

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science


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