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UID:0-400@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20180307T163000

DTEND;TZID=Asia/Jerusalem:20180307T173000

DTSTAMP:20230530T180358Z

URL:https://aerospace.technion.ac.il/events/numerical-simulation-of-a-boro
 n-loaded-gel-fuel-ramjet-combustor/

SUMMARY:Numerical Simulation of a Boron Loaded Gel Fuel Ramjet Combustor
DESCRIPTION:Lecturer:David Diskin\n Faculty:Department of Aerospace Enginee
 ring\n Institute:Technion – Israel Institute of Technology\n Location:Cl
 assroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract:
  \n Details: \n The ramjet is an air-breathing propulsion engine\, which r
 elies on the ram effect for compressing the entering air\, thus\, eliminat
 ing the need for a compressor. Ramjets have no moving parts\, the entering
  air is compressed aerodynamically is mixed with the fuel and ignited. Fin
 ally\, the burned gases accelerate in a converging-diverging nozzle genera
 ting thrust.\nIn the present research\, the ramjet engine fuel is kerosene
  gel in which boron particles have been added. Boron has 140% energy per u
 nit mass in comparison to hydrocarbon fuels and 300% energy per unit volum
 e. Gelled kerosene provides the means that contain the boron powder and pr
 events particle sedimentation.\nAn early study of Hadad et al. showed the 
 high performance potential of a boron loaded ramjet engine with specific i
 mpulse higher than 2\,000 s. The scope of the present study is to evaluate
  the performance of a ramjet loaded with boron and to investigate the effe
 ct of the various parameters\, such as bypass ratio and boron content. The
  study uses a commercial numerical CFD solver (FLUENT) to simulate a 3D co
 mbustion chamber of a ramjet with an aft burner in which bypass air is inj
 ected.\nBoron ignition and combustion has been modelled using King’s mod
 el. The model divides the combustion of the boron into two stages. Initial
 ly\, the boron particles are covered by a boron-oxide thin layer that prev
 ents from ambient oxygen to reach the boron core and react. After the remo
 val of the boron oxide layer\, combustion begins releasing the chemical en
 ergy of the boron particles.\nThe simulation of the boron combustion is ti
 me dependent and deals with the particle phase separately from the CFD sim
 ulation. In each time step the diameter of the boron particles and the hea
 t release are calculated. The particle distribution is polydisperse and th
 e particles are injected into the flowfield together with the gel fuel.\nT
 he results include the temperature\, velocity and particle distribution fl
 owfield and eventually the performance of the ramjet is derived.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20171029T010000

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