Rocket Propulsion

# Rocket Propulsion - Rocket Propulsion JIN KANG Content...

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Rocket Propulsion JIN KANG

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2 Content ! Introduction to Rocket ! Thrust ! Rocket equation ! Other performance parameters
3 Roles of Propulsion System ! Get spacecraft into space ! Move around spacecraft in orbit ! Change attitude of spacecraft

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4 Thrust ! for every action there is an equal but opposite reaction ! Thrust is generated through change in momentum ! Expulsion of high energy mass creates equal reaction in opposite direction
5 Description of Thrust ! Exhaust momentum = change in vehicle momentum ! Exhaust momentum = total mass flow x exit velocity

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6 Example ! V Values ! Required ! V ! ! V to LEO : approximately 9.5 km/s ! Parking orbit to GEO : approximately 4.2 km/s ! Mars fly-by: additional 3.4 km/s ! Solar system escape : additional 8.5 km/s ! GEO station keeping: 0.03~0.4 km/s
7 Rocket Equation-I sp ! I sp (specific impulse) ! Can think of it as mileage ! Indicates fuel efficiency of propulsion system ! High I sp does not mean high thrust!!

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8 Effective Exhaust Velocity ! Effective exhaust velocity, C, is often used to compare propulsion system ) ( atmosphere exit exit exit P P m A V C ! " # !
Rocket Equation-Thrust and ! V t P C m F rocket thrust \$ \$ # # ! % % ( ( ) * # \$ final

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Rocket Propulsion - Rocket Propulsion JIN KANG Content...

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