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Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Feastibility study and comparative study of air breathing electric propulsion systems operating in very low Earth orbit conditions
 Šťastný, Marek ; Dytrych, Tomáš ; Dániel, Vladimír ; Mrózek, Kryštof ; Obrusník, Adam
Air Breathing Electric Propulsion (ABEP) systems offer a promising solution to extending the lifetime of Very Low Earth Orbit (VLEO) missions by using residual atmospheric particles as a propellant. ABEP systems need to provide sufficient thrust to compensate for substantial aerodynamic drag present in VLEO environments. The feasibility of operating a hypothetical ABEP system of a given geometry at a given altitude is assessed via Direct Simulation Monte Carlo (DSMC) based on the following parameters: the mean pressure in the ionization chamber, compression factor and drag force acting upon the surface of the given geometry. Atmospheric models were used for reference to ensure realistic VLEO-like conditions. The comparative study is performed using a Global Plasma Model (GPM). A GPM can calculate the volume-averaged quantities of plasma systems with complex physics and reaction kinetics. The results of GPM are compared with a breadboard model of an Electron Cyclotron Resonance (ECR) ABEP system constructed by the Czech aerospace research institute (VZLU a.s.).
Úplný záznam
From Magnetic Resonance To The Low Earth Orbit: Simulation Aided Design Of Birdcage Antenna With Application In The Atmosphere-Breathing Electric Propulsion Engine
 Juřík, Karel
This paper deals with the design and validation of the birdcage coil and with the proposalof its implementation into the Atmosphere-Breathing Electric Propulsion Engine (ABEP).The coil was designed, analysed, and tuned using ANSYS HFSS software and the results wereevaluated against the measurement of the prepared prototype. The difference between the measuredand required frequency was approximately 2.7 %. Although the coil needs to be further optimized,the ability to achieve the desired frequency was demonstrated.
Úplný záznam

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