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UID:0-189@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20220302T133000

DTEND;TZID=Asia/Jerusalem:20220302T143000

DTSTAMP:20230108T145922Z

URL:https://aerospace.technion.ac.il/events/investigation-of-submerged-wat
 er-breathing-marine-ramjet/

SUMMARY:Investigation of Submerged Water-Breathing Marine Ramjet
DESCRIPTION:Lecturer:Nachum-Eliyahu Eisen\n Faculty:Department of Aerospace
  Engineering\n Institute:Technion – Israel Institute of Technology\n Loc
 ation:Classroom 165\, ground floor\, Library\, Aerospace Eng & https://tec
 hnion.zoom.us/j/98452539510\n Zoom: \n Abstract: \n Details: \n The resear
 ch presents a novel approach for propelling high-speed\, submerged\, marin
 e vehicles. The operating principle is based on the operation of a ram-roc
 ket (ducted-rocket) motor (solid or hybrid)\, where water is introduced th
 rough an inlet due to the vehicle motion\, and mixed with the hot propella
 nt gases. Theoretical predictions reveal specific impulse increase as high
  as 70% for non-water-reactive propellants\, and over 100% for water-react
 ive propellants containing aluminum or magnesium\, relatively to a paralle
 l non-water-breathing motor. The increase in specific impulse means a subs
 tantial increase in range and operating time.  Static firing tests of hyb
 rid motors without and with water addition revealed major increase in thru
 st and standard specific impulse\, reaching a peak of 485 s due to water a
 ddition when using polyester fuel containing 30% magnesium (twice the spec
 ific impulse of a solid rocket). A series of underwater tests of hybrid ra
 m-rockets in the lab pool at cruise speeds as high as 25 m/s (90 km/h) dem
 onstrated ignition\, sustained combustion\, and noticeable pressure build-
 up in the combustion chamber due to incoming water through the nose inlet.
  Such underwater experiments are unique and had never been published befor
 e in the open literature.\nThe presentation will include video clips of un
 derwater operation of a water-breathing ducted-rocket vehicle.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng & https://t
 echnion.zoom.us/j/98452539510

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