propulsive$64618$ - définition. Qu'est-ce que propulsive$64618$
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Qu'est-ce (qui) est propulsive$64618$ - définition

NOZZLE THAT CONVERTS THE INTERNAL ENERGY OF A WORKING GAS INTO PROPULSIVE FORCE
Jet nozzle; Propulsive nozzle
  • Sketch showing rearward-discharge of gas from exhaust manifold.
  • Sectioned Jumo 004 exhaust nozzle, showing the ''Zwiebel'' central plug.

Propulsive fluid accumulator         
SELF-FILLING ORBITAL ROCKET FUEL DEPOT
Accumulating Space Device (ASD); Accumulating space device; PROFAC; Propulsive Fluid Accumulator
A Propulsive Fluid Accumulator is an artificial Earth satellite which collects and stores oxygen and other atmospheric gases for in-situ refuelling of high-thrust rockets. This eliminates the need to lift oxidizer to orbit and therefore brings significant cost benefits.
Propelling nozzle         
A propelling nozzle is a nozzle that converts the internal energy of a working gas into propulsive force; it is the nozzle, which forms a jet, that separates a gas turbine, or gas generator, from a jet engine.
Propulsive efficiency         
  • Dependence of the propulsive efficiency (<math>\eta_p</math>) upon the vehicle speed/exhaust speed ratio (v_0/v_9) for rocket and jet engines
  • Propulsive efficiency comparison for various gas turbine engine configurations
MEASURE OF EFFICIENCY
In aerospace engineering, concerning aircraft, rocket and spacecraft design, overall propulsion system efficiency \eta is the efficiency with which the energy contained in a vehicle's fuel is converted into kinetic energy of the vehicle, to accelerate it, or to replace losses due to aerodynamic drag or gravity. Mathematically, it is represented as \eta = \eta_c \eta_p,ch10-3 where \eta_c is the cycle efficiency and \eta_p is the propulsive efficiency.

Wikipédia

Propelling nozzle

A propelling nozzle is a nozzle that converts the internal energy of a working gas into propulsive force; it is the nozzle, which forms a jet, that separates a gas turbine, or gas generator, from a jet engine.

Propelling nozzles accelerate the available gas to subsonic, transonic, or supersonic velocities depending on the power setting of the engine, their internal shape and the pressures at entry to, and exit from, the nozzle. The internal shape may be convergent or convergent-divergent (C-D). C-D nozzles can accelerate the jet to supersonic velocities within the divergent section, whereas a convergent nozzle cannot accelerate the jet beyond sonic speed.

Propelling nozzles may have a fixed geometry, or they may have variable geometry to give different exit areas to control the operation of the engine when equipped with an afterburner or a reheat system. When afterburning engines are equipped with a C-D nozzle the throat area is variable. Nozzles for supersonic flight speeds, at which high nozzle pressure ratios are generated, also have variable area divergent sections. Turbofan engines may have an additional and separate propelling nozzle which further accelerates the bypass air.

Propelling nozzles also act as downstream restrictors, the consequences of which constitute an important aspect of engine design.