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UID:0-1584@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20260817T133000

DTEND;TZID=Asia/Jerusalem:20260817T143000

DTSTAMP:20260629T075442Z

URL:https://aerospace.technion.ac.il/events/seminar-shavit-attar-17aug2026
 /

SUMMARY:Closed-Loop Control of a Dual-Mode Scramjet with Fuel Injection Dis
 tribution
DESCRIPTION:Lecturer:Shavit Attar\n Faculty:Department of Aerospace Enginee
 ring\n Institute:Technion – Israel Institute of Technology\n Location:Cl
 assroom 240\, 1st floor\, Aerospace Eng. building\n Zoom: https://technion
 .zoom.us/j/98372598857\n Abstract: This study demonstrates closed-loop con
 trol of the shock train leading-edge location in a dual-mode scramjet comb
 ustor using fuel-injection distribution as the control input. Experiments 
 were performed in a direct-connect\, cavity-stabilized combustor with dist
 ributed ethylene injection.\n\nIn the first part\, wall-pressure measureme
 nts\, high-speed CH* chemiluminescence\, and high-speed shadowgraph imagin
 g were used to examine the effects of fuel distribution on flame stabiliza
 tion\, thermal choking\, and shock train dynamics. At sufficiently high eq
 uivalence ratios\, 37% downstream injection produced a stable jet-wake fla
 me\, whereas upstream-only injection at similar conditions produced an osc
 illating flame between the cavity shear layer and fuel jet wake. A thermal
  choking regime map showed that sufficiently increasing the downstream inj
 ection fraction can shift the combustor from thermally choked to unchoked.
  Shadowgraph images showed shock structures in the combustion region in bo
 th thermally choked and unchoked cases. Shock train locations for thermall
 y choked cases\, obtained using a pressure-standard-deviation criterion\, 
 shifted upstream with increasing equivalence ratio or decreasing downstrea
 m injection fraction.\n\nIn the second part\, wall-pressure measurements w
 ere used to estimate the shock train location\, and a proportional-integra
 l controller adjusted the downstream injection fraction in real time. Quas
 i-steady experiments showed that the shock train response to fuel redistri
 bution is nonlinear and depends on the operating condition\, with reduced 
 control authority near the thermal choking boundary. Open-loop step respon
 se experiments were used to identify low-order dynamic models for controll
 er design. Closed-loop tests demonstrated commanded shock train motion and
  suppression of upstream shock train displacement caused by an increase in
  equivalence ratio. These results show the potential of distributed fuel i
 njection as an active control method for shock train positioning and unsta
 rt prevention in dual-mode scramjet engines.\n\nThis work is towards an M.
 Sc. degree under the supervision of Assoc. Prof. Dan Michaels\, The Stephe
 n B. Klein Faculty of Aerospace Engineering\, Technion.\n Details: \n 
CATEGORIES:Seminars
LOCATION:Classroom 240\, 1st floor\, Aerospace Eng. building

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