Separated-flow considerations for pressure-atomized combusting monopropellant sprays

T. W. Lee, L. K. Tseng, G. M. Faeth

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

The drop and spray combustion properties of the hydroxyl-ammonium nitrate (HAN)-based monopropellant LGP 1845 were studied. Drop-burning rates were measured with drops supported in a combustion gas environment at pressures of 0.2-7.0 MPa. Some internal gasification of drops-causing swelling, partial bursting, and microexplosions-was observed throughout this region, but these disturbances decreased with increasing pressure. Effective drop-burning rates (including effects of both surface gasification and bursting) were relatively constant, ca. 10 mm/s, and were consistent with earlier strand-burning-rate measurements of gelled propellant. Pressure-atomized combusting sprays were studied in combustion gas environments at pressures of 3-9 MPa. The liquid-containing region was significantly larger than earlier measurements of Birk and Reeves,19 as well as predictions based on the locally-homogeneous-flow approximation of multiphase flow theory. In conjunction with drop-trajectory calculations, based on present measurements of drop-burning rates, these findings suggest significant effects of separated flow in combusting HAN-based monopropellant sprays.

Original languageEnglish (US)
Pages (from-to)382-391
Number of pages10
JournalJournal of Propulsion and Power
Volume6
Issue number4
DOIs
StatePublished - 1990
Externally publishedYes

ASJC Scopus subject areas

  • Aerospace Engineering
  • Fuel Technology
  • Mechanical Engineering
  • Space and Planetary Science

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