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UID:0-226@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20211027T183000

DTEND;TZID=Asia/Jerusalem:20211027T193000

DTSTAMP:20230409T141725Z

URL:https://aerospace.technion.ac.il/events/experimental-investigation-of-
 circular-scramjets-in-high-enthalpy-flows-from-flow-choking-to-inlet-buzz/

SUMMARY:Experimental Investigation of Circular Scramjets in High Enthalpy F
 lows: From Flow Choking to Inlet Buzz
DESCRIPTION:Lecturer:Qili Liu\n Faculty:School of Aeronautics and Astronaut
 ics\n Institute:Purdue University\n Location:https://purdue-edu.zoom.us/j/
 7448516056\n Zoom: \n Abstract: \n Details: \n Unsteady fluid-combustion i
 nteractions in optical axisymmetric scramjet models are experimentally inv
 estigated in Mach 4.5 flows. The axisymmetric scramjet reveals generic flu
 id and combustion dynamics without the corner boundary-layer effects that 
 can distort flame propagation in rectangular geometries. Fluid and combust
 ion dynamics are characterized by pressure measurement on the combustor wa
 ll along the entire flowpath. High-speed flame chemiluminescence and lumin
 osity imaging are used to visualize the unsteady shock and flame propagati
 ons driven by fluid-combustion interactions. It is shown that the initial 
 choking location of the scramjet combustors depends on the competing effec
 t of combustion heat addition and combustor area relief. For the 2° combu
 stor\, the combustion-induced flow choking occurs inside the diverging sec
 tion of the combustor\, while the 5° combustor cannot be thermally choked
  due to the excessive area expansion. The unsteady pseudo shock propagates
  upstream until it reaches the cavity flameholder. A shock train is establ
 ished in the isolator to balance the pressure rise downstream. Once the sh
 ock train is disgorged out of the inlet\, a normal shock is formed in fron
 t of the inlet\, i.e.\, inlet unstart. Inlet buzz phenomenon is observed a
 t unstarted conditions due to the fluid-combustion interaction. The buzz f
 requency is correlated to the acoustic wave propagation in the subsonic fl
 ow regime established between the inlet and the flow choked location. Neve
 rtheless\, the resonance mode for a duct with an open and a closed-end is 
 applicable only to the case with an initial choking location at the cavity
  ramp.\nZoom Meeting
CATEGORIES:Seminars
LOCATION:https://purdue-edu.zoom.us/j/7448516056

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