Electric Powered Compressed Air Plane Engine

Mithion

10 W
Joined
Aug 7, 2012
Messages
79
Would this work?


The nose of the plane features an inlet similar to those found on an F86 Sabre and FJ Fury. Recessed within this inlet sits the main propulsion components. A bank of lithium polymer batteries housed in the belly of the fuselage power an electric motor which turns a series of turbofans. These turbo fans compress and heat the air with the aid of glow plugs which is than fed into a vectored propelling nozzle system built into the design of the tail section that further heats the air and forces it out of the tail end, there is no fuel or combustion.
The vectored propelling nozzle operates by using the narrowest part, called the throat, to increase pressure within the system by further constricting the already compressed and heated airflow, then expanding the resulting air stream to atmospheric pressure and finally forming it into a high speed jet to propel the plane through an outlet in the tail section.

Just an idea.
 
airflow vs heat, i think you might need about a 1000 glow plugs to keep the heat to any reasonable temp :D. ducted rc plane motors would do the same job but without the heat.
but
 
Ok so this system just wouldn't heat the air enough?

Even after being heated from compression and glow plugs and the propelling nozzle constriction?

Hmmmm
 
How bout this- EDITED

The nose of the plane features an inlet similar to those found on an F86 Sabre and FJ Fury. Recessed within this inlet sits the main propulsion components. A bank of lithium polymer batteries housed in the belly of the fuselage power an axial flow electric motor which turns a series of air foils. Axial-flow compressors use arrays of fan-like airfoils to progressively compress incoming air. The arrays of airfoils are set in rows as pairs: one rotating and one stationary. The rotating airfoils, also known as blades or rotors, accelerate the fluid. The stationary airfoils, also known as stators or vanes, decelerate and redirect the flow direction of the fluid, preparing it for the rotor blades of the next stage. These air foils are used along with a series of glow plugs to further heat the air which is than fed into a unique Variable Geometry Vectored Propelling Nozzle (VGVPN) system built into the design of the tail section that further heats the air and forces it out of the tail end, there is no fuel or combustion. The VGVPN operates by using the narrowest part, called the throat, to increase pressure within the system by again further constricting/heating the already compressed air, then expanding the resulting stream to ambient pressure and finally forming it into a high speed jet to propel the plane through an ejector outlet. The variable geometry is used to give different throat and exit diameters so as to deal with differences in ambient pressure, flow and engine pressure; thus permitting improvement of thrust and efficiency. The whole system creates forward thrust on the airframe by imparting a net rearward momentum onto the air via producing a jet of "exhaust" gas, which, when fully expanded, has a speed that exceeds the aircraft's airspeed. To generate thrust quickly from idle, the propelling nozzle is used with variable area. While at idle, the nozzle is set to its open configuration for minimum thrust and high engine rpm, but when high thrust is needed, for example during take-off, constricting the nozzle will quickly generate high thrust. The rear most tail section, the last section of the system, contains an "Ejector" which creates a secondary effective nozzle through secondary airflow and spring-loaded petals. At subsonic speeds, the airflow constricts the exhaust to a convergent shape. As the aircraft speeds up, the ejector nozzle dilates, which allows the exhaust to form a convergent-divergent shape, speeding up the exhaust gasses for more thrust.
 
In your scenario, it would first be quite a lot more efficient to drive a prop, however if you wanted ducted fan velocities, it would then be better to just run many individual ducted fans.

Think of making thrust as the mass of air you can accelerate behind you. Single prop is so much less drag for the amount of air it moves, ducted fans quite a lot worse, series ducted fans substantially worse than that, and even if you dumped say 50kW into heating the air, if you were to have dumped that same power into props (or more ducted fans) you would get orders of magnitude more thrust.
 
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