L8_Propulsion_IA - Compass-2 Microsatellite Technology L11...

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L11 - Propulsion Physics in Space Programme, IRF, Uppsala, Sweden | www.phisp.irfu.se Microsatellite Technology L11 – Propulsion SMAD ch. 17 Ilona Alexandersson, February 16, 2010 Swedish Institute of Space Physics, Uppsala, Sweden http://www.physics.irfu.se Compass-2
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L11 - Propulsion Physics in Space Programme, IRF, Uppsala, Sweden | www.phisp.irfu.se Introduction Important parameter for rocket design Rocket equation Short history of rockets How propulsion systems work Types of rockets and examples of missions they were used in
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L11 - Propulsion Physics in Space Programme, IRF, Uppsala, Sweden | www.phisp.irfu.se Thrust is the amount of force applied to the rocket based on the expulsion of gases is given by the equation; Where Ae is the nozzle exit area, Pe is the gas pressure at the nozzle exit, P∞ is the ambient pressure, Ve is propellant exhaust velocity and m is propellant mass flow rate. ) P - (P A e e + = e V m F
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L11 - Propulsion Physics in Space Programme, IRF, Uppsala, Sweden | www.phisp.irfu.se Specific impulse is defined as the ratio of the thrust to the flow rate of the weight ejected is given by the equation; for the maximum thrust; is a measure of the energy content of the propellants and how efficiently it is converted to thrust g m F I sp g V I e sp =
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L11 - Propulsion Physics in Space Programme, IRF, Uppsala, Sweden | www.phisp.irfu.se The rocket equation The most important measure of a propulsion systems performance is the velocity change ΔV it can produce The velocity change is given by; Where m0 is the initial vehicle mass, mp is the mass of the propellant consumed, mf is the final vehicle mass and R is the mass ratio Describes the ideal case R gI m m gI m m m gI V sp f sp p sp ln ln ln 0 0 0 = - =
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L11 - Propulsion Physics in Space Programme, IRF, Uppsala, Sweden | www.phisp.irfu.se required mass of propellant based on either the initial or final mass of the rocket; ( 29 ( 29 ( 29 ( 29 g I V g I V f p sp sp e m e m m / 0 / 1 1 - - = - =
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L11 - Propulsion Physics in Space Programme, IRF, Uppsala, Sweden | www.phisp.irfu.se The history of rockets 13th century solid fueled rockets used by the Chinese in warfare Rocket comes from Rocchetta=little fuse
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L11 - Propulsion Physics in Space Programme, IRF, Uppsala, Sweden | www.phisp.irfu.se n Modern rockets born in 1920s n Adding a de Laval nozzle doubled the thrust and raised the engine efficiency from 2 to 64%. n
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L8_Propulsion_IA - Compass-2 Microsatellite Technology L11...

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