Lox jet atomization under transverse acoustic oscillations

Justin S. Hardi, Harvey Camilo Gomez Martinez, Michael Oschwald, Bassam B. Dally

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Testing has been conducted with the BKH rocket combustor at the European Research and Technology Test Facility P8 for cryogenic rocket engines at DLR Lampoldshausen. BKH has multiple shear coaxial injectors and an exhaust modulation system for forcing excitation of acoustic resonances in the combustion chamber. Optical access windows allow the application of parallel high-speed shadowgraph and flame emission imaging of the near-injector region. This paper reports measurements of the intact liquid oxygen core during forced excitation of the first transverse acoustic mode. High-speed shadowgraph images show that the mechanism of core breakup and atomization differs between off-resonance and first transverse excitation conditions. The core length is found to decrease with increasing amplitude of acoustic pressure, or equivalently with transverse acoustic velocity, with a core length reduction of up to 70% for conditions approaching those of naturally occurring high frequency combustion instabilities. This dependence is shown to be distinguishable for differing operating conditions of the combustor. Fluctuation in core length also decreases with increasing excitation amplitude. Knowledge of the influence of the transverse acoustic field on the LOx core is important for understanding the driving mechanisms of combustion instabilities. © 2013 by the authors.
Original languageEnglish (US)
Pages (from-to)337-349
Number of pages13
JournalJournal of Propulsion and Power
Volume30
Issue number2
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

ASJC Scopus subject areas

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

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