Gas property measurements in a supersonic combustor using nanosecond gated laser-induced breakdown spectroscopy with direct spectrum matching

Brendan McGann, Campbell D. Carter, Timothy M. Ombrello, Stephen Hammack, Tonghun Lee, Hyungrok Do

Research output: Contribution to journalArticle

Abstract

Gas density and fuel mole fraction in a cavity flameholder of a supersonic combustor with ethylene fueling were simultaneously assessed using nanosecond gated laser-induced breakdown spectroscopy. Emission spectra from the laser-induced plasma over at 550-830 nm containing multiple emission lines of O H N and C were captured and used to quantify the gas conditions. Fuel mole fraction and gas density were mapped within a cavity flameholder on planes parallel to the Mach 2 freestream flow above the cavity. A high fuel mole fraction region appeared near the front step where density and flow velocity are low and thus favorable for cavity flame ignition. The fuel mole fraction at a location in the cavity was almost proportional to fueling rate while the gas density was unaffected by the fueling rate under the typical operating conditions.

Original languageEnglish (US)
Pages (from-to)2857-2864
Number of pages8
JournalProceedings of the Combustion Institute
Volume36
Issue number2
DOIs
StatePublished - Jan 1 2017

Keywords

  • Cavity flameholder
  • Gated LIBS
  • Laser-induced breakdown
  • Scramjet

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Gas property measurements in a supersonic combustor using nanosecond gated laser-induced breakdown spectroscopy with direct spectrum matching'. Together they form a unique fingerprint.

  • Cite this