Isolator shock dynamics of mass injection-induced unstart in a circular model scramjet

Damiano Baccarella, Qili Liu, Brendan McGann, Tonghun Lee

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

Abstract

The shock dynamics in the isolator of a free-jet model scramjet is investigated during unstart at low enthalpy conditions. Mass injection is used to choke the combustor flow and cause unstart by simulating the blockage effect of combustion heat release. The model scramjet used has a constant area circular cross section and optically accessible isolator and combustor. A detailed characterization of the unstart process was provided by wall pressure measurements and high-speed (10 kHz) CO2 Rayleigh scattering imaging. In response to the backpressure rise induced by mass injection, the flow in the isolator separates, forming a shock-train. The flow in the combustor stays supersonic until choking occurs near the exit. Once the flow is choked, a pseudo-shock propagates upstream and reaches the injectors location, where it starts interacting with the isolator shock-train. Under particularly severe blockage conditions the shock system ultimately disgorges from the inlet causing unstart.

Original languageEnglish (US)
Title of host publication23rd AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2020
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624106002
StatePublished - 2020
Event23rd AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2020 - Montreal, Canada
Duration: Mar 10 2020Mar 12 2020

Publication series

Name23rd AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2020

Conference

Conference23rd AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2020
CountryCanada
CityMontreal
Period3/10/203/12/20

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science
  • Control and Systems Engineering

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