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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:11 |
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Conference: Bucharest University Faculty of Physics 2017 Meeting
Section: Physics Education
Title:
Momentum conservation in the dynamics of some reactive engines in vertical motion
Authors:
Rareş IOVĂNESCU, Alin SEVESTREAN, Tiberius O. CHECHE
Affiliation:
Faculty of Physics, University of Bucharest
E-mail
tiberiuscheche@yahoo.com
Keywords:
momentum conservation, pulsejet, V-1 flying bomb, turbojet, cephalopod, octopus
Abstract:
By applying the momentum conservation law the dynamics of a pulsejet engine in vertical motion in a uniform gravitational field and in the absence of friction is analyzed following [1]. In the limit of short pulses, the model predicts the existence of a terminal speed given the pulse frequency. The dynamics models of the pulsejet and turbojet engine [2, 3] are compared . The pulsejet model is applied to aircraft and octopi in vertical motion. The validity limits of the frictionless model are discussed.
References:
[1] Tiberius O. Cheche, Pulsejet engine dynamics in vertical motion using momentum conservation, Eur. J. Phys. 38 (2017) 025001 (14pp).
[2] Johnson W, Soden P D and Trueman E R 1972 A study in jet propulsion: an analysis of the motion of the squid, Loligo vulgaris J. Exp. Biol. 56 155–65.
[3] Wojcicki S, Pulsejet, Jet, and Rocket Engines, 1967.
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