AOSS 101 Midterm: Mid-Term2StudyGuide
29 Mar 2016
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Newton"s third law: for every action, there is an equal and opposite reaction. Thrust= mass flow rate x exhaust velocity. Impulse(i): thrust integrated over burn time (units same as momentum kgm/s) Leaks, explosions, fuel degradations, no spark , cracks, radio signals start igniter. High pressure inside rocket makes high velocity and high mass flow rate. Low pressure outside rocket combined with a delaval nozzle allows high velocity and high mass flow rate. Solid: reliability: fewer moving parts, fuel and oxidizer, higher mass fractions (higher density and lower tankage, operational simplicity. Liquid: higher exhaust velocity (higher isp, controllable thrust, restart capability, termination control. Generate a large electric field and expel charged particles. Very high isp, so it needs less fuel. If with humans, engine must be well removed from crew. Fuse together light elements to make heavier elements. Directly expel heated fuel for high isp rocket. Large magnetic fields confine the plasma and then direct it to exhaust similar to.
