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UID:0-241@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20210405T123000

DTEND;TZID=Asia/Jerusalem:20210405T133000

DTSTAMP:20230417T065952Z

URL:https://aerospace.technion.ac.il/events/optimization-of-energy-distrib
 ution-in-nanosecond-pulsed-high-frequency-discharge-ignition/

SUMMARY:Optimization of Energy Distribution in Nanosecond-Pulsed High-Frequ
 ency Discharge Ignition
DESCRIPTION:Lecturer:Iker Laso\n Faculty:Department of Aerospace Engineerin
 g\n Institute:Technion – Israel Institute of Technology\n Location:https
 ://technion.zoom.us/j/98684528360\n Zoom: \n Abstract: \n Details: \n Igni
 tion is a challenge for gas turbines\, ramjets and scramjets where flow ve
 locities in the combustor are high\, resulting in short flow residence tim
 es. The success of ignition depends on the flow conditions\, as well as th
 e ignition method. In the past years\, nanosecond-pulsed high-frequency di
 scharge (NPHFD) plasmas have been pointed out as an optimal alternative ig
 nition method in flowing mixtures\, given that they offer several advantag
 es as compared to a long duration DC discharge. Previous works have shown 
 that the interaction between subsequent ignition kernels lead to three dif
 ferent coupling regimes based on their ignition probability (PI): fully-co
 upled (highest PI)\, partially-coupled (lowest PI) and decoupled (PI linea
 rly dependent on the number of pulses)\, which occur at different inter-pu
 lse time conditions.\nIn the current research\, a new experimental platfor
 m has been built to explore NPHFD ignition. It has been found that the PI 
 of the aforementioned regimes can be altered by varying the energy per pul
 se (Epp). In fact\, high Epp has resulted in the disappearance of the part
 ially-coupled regime\, and low Epp has proven a negligible PI except for t
 he fully-coupled regime. It has also been found that the minimum ignition 
 power – defined as the applied power that results in 50% of PI – decre
 ases linearly as the Epp is lowered. The kernel-growth rate has been found
  similar in all the tested cases.\nAdditionally\, energy distribution has 
 been optimized by matching the total energy and time of the discharge\, an
 d varying the number of pulses and the Epp. It has been concluded that the
  inter-pulse time is the driving parameter of the ignition probability. In
 deed\, it has been observed that low total energy and long total time disc
 harges can provide a high PI at the right IPT.\nZoom meeting
CATEGORIES:Seminars
LOCATION:https://technion.zoom.us/j/98684528360

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