lecture_1Manuel Martinez-Sanchez

lecture_1Manuel Martinez-Sanchez - 16.512 Rocket Propulsion...

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16.512, Rocket Propulsion Prof. Manuel Martinez-Sanchez Lecture 1: Introduction Types of Rockets (Engines) - Depending on gas acceleration mechanism/force on vehicle mechanism . “Thermal” Gas pushes directly on walls by P (pressure) forces Nozzle accelerates gas by P forces (most large rockets, chem, nuclear, some electric…) Electrostatic Ions accelerated by JG E field (a) Electrostatic force (push) on electrodes (Ion engines) (b) Force (push) on magnetic coils through gas j G (Hall thrusters) Electromagnetic Gas accelerated by × G JG j B forces Force (push) on coils or conductors (MPD thrusters, PPT’s) 16.512 concentrates on Thermal - Depending on energy source : Solid Propellant Chemical (always “thermal”) Liquid Propellant Monopropellant Bipropellant Hybrid Nuclear (Thermal) Nuclear (Electric) can be Thermal, ES or EM Solar (Thermal) Solar (Electric) can be Thermal, ES or EM 16.512 deals mostly with Chemical. - Depending on Thrust level (per unit mass) - High thrust ( 1 g ) for launch, fast space maneuvering (16.512) - Low thrust (10 -5 – 10 -2 g ) for efficient in-space maneuvers (16.522) 16.512, Rocket Propulsion Lecture 1 Prof. Manuel Martinez-Sanchez Page 1 of 3
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