123 research outputs found
Laser-propelled ram accelerator
The concept of 'laser-propelled ram accelerator (L-RAMAC)' is proposed. Theoretically it
is capable of achieving a higher launch speed than that by a chemical ram accelerator because a higher
specific energy can be input to the propellant gas. The laser beam is supplied through the muzzle, focused
as an annulus behind the base of the projectile. The performance of L-RAMAC is analized based on
generalized Rankine-Hugoniot relations, suggesting that a superorbital muzzle speed is achievable out of
this device
Effects of magnetic field profile near anode on ion acceleration characteristics of adiverging magnetic field electrostatic thruster
Ram accelerator operations at acceleration level up to 6 x 104 g
Experiments were conducted using a 25-mm-bore ram accelerator. By varying the projectile mass and the
mixture fill pressure, the projectile acceleration level was varied by a factor of three. The acceleration performance
is evaluated based on a ballistic efficiency. Over a velocity range from 80% to 110% of Chapman-Jouguet
detonation velocity, the ballistic efficiency was kept almost constant, and did not depend on the acceleration level
Improvement of Supersonic Aerodynamic Performance Using Repetitive Laser Energy Depositions
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