Ethylene flame dynamics in an arc-heated hypersonic wind tunnel

H. Do, A. Passaro, Q. Liu, T. Lee, D. Baccarella

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ethylene flame dynamics in a model scramjet is investigated using a pulsed-arc-heated hypersonic wind tunnel simulating supersonic/hypersonic flight conditions (Mach 4.5, 6 and 9 flows of up to 3,500K stagnation temperature). A partially-premixed ethylene flame is auto-ignited with Mach 4.5, 6 and 9 freestream flows in a region downstream of a fuel jet where the high enthalpy flow is compressed and decelerated by incident/reflected shockwaves and development of boundary layers. This flame propagates upstream and anchores at a location depending on flow conditions. In the case of Mach 4.5 freestream flows, inlet unstart phenomenon is observed by excessive heat release from ethylene combustion reactions over a range of fuel concentration (overall equivalence ratio = 1.5 - 2.3). Flame evolution during a test time of hundreds milliseconds is optically resolved by a fast framing camera simultaneously with surface temperature/pressure measurement in the model scramjet. The pressure/temperature traces along with time-sequential flame images (300 Hz) describe the flame dynamics, e.g., flame propagation and flame holding near a wall cavity.

Original languageEnglish (US)
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
StatePublished - 2013
Externally publishedYes
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: Jan 7 2013Jan 10 2013

Publication series

Name51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

Conference

Conference51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
Country/TerritoryUnited States
CityGrapevine, TX
Period1/7/131/10/13

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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