Influences of inlet geometry modification on scramjet flow and combustion dynamics

Qili Liu, Damiano Baccarella, Tonghun Lee, Stephen Hammack, Campbell D. Carter, Hyungrok Do

Research output: Contribution to journalArticlepeer-review


The influences of inlet geometry modification on flow and combustion dynamics are experimentally investigated in a model supersonic combustion ramjet (scramjet) installed in Mach 4.5 high-enthalpy air freestreams. The inlet upper-lip angle (6, 12, and 20 deg) and the intake contraction ratio (1.3 and 1.9) chosen as the generic inlet design parameters are varied. With the inlet geometries systematically modified, flowfields inside the model scramjet are visualized at cold conditions (room temperature) using a planar laser Rayleigh scattering method (wherein laser radiation is scattered by carbon dioxide particles). In addition, combustion dynamics and structures in the scramjet combustor are investigated in high-enthalpy flows with a total temperature of 2600Kcapable of autoigniting injected fuels. High-frame-rate time-averaged chemiluminescence (broadband) imaging and hydroxyl planar laser-induced fluorescence are used for this investigation. Incident shock-wave strength, separated flow behavior, boundary-layer development, combustion structure/anchoring, and chemiluminescence intensity are found to be sensitive to the inlet geometry modifications.

Original languageEnglish (US)
Pages (from-to)1179-1186
Number of pages8
JournalJournal of Propulsion and Power
Issue number5
StatePublished - 2017

ASJC Scopus subject areas

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


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