start-ver=1.4
cd-journal=joma
no-vol=28
cd-vols=
no-issue=1
article-no=
start-page=106
end-page=112
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2012
dt-pub=2012
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Mechanism and Control of Combustion-Mode Transition in a Scramjet Engine
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= A sidewall compression scramjet engine operated in two combustion modes under Mach 6 flight condition, weak- and intensive-combustion modes. The weak mode occurred below the overall fuel equivalence ratio (Φ) of around 0.4. Transition from the weak mode to the intensive mode occurred at Φ ~ 0.4, accompanied by a sudden increase in thrust. Mechanisms of the transition were numerically investigated in this study. Our simulations captured the sudden increase in thrust at the mode transition. In the weak mode, combustion occurred in only a region near the topwall where an igniter was installed. The combustion region expanded toward the cowl with boundary-layer separation at the mode transition. Our simulations demonstrated that low ignition capability resulted in the weak mode. We demonstrated that the presence of additional igniters on the sidewalls improved the ignition capability and achieved the intensive mode in the entire Φ range.
en-copyright=
kn-copyright=

en-aut-name=KouchiToshinori
en-aut-sei=Kouchi
en-aut-mei=Toshinori
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=MasuyaGoro
en-aut-sei=Masuya
en-aut-mei=Goro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MitaniTohru
en-aut-sei=Mitani
en-aut-mei=Tohru
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=TomiokaSadatake
en-aut-sei=Tomioka
en-aut-mei=Sadatake
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=graduate school of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Tohoku University
kn-affil=

affil-num=3
en-affil=Japan Aerospace Exploration Agency
kn-affil=

affil-num=4
en-affil=Japan Aerospace Exploration Agency
kn-affil=
END