Rocket Propulsion Exam 1 Prep|2023 LATEST UPDATE|GUARANTEED SUCCESS

Thrust T = ma Thrust term (pe - pa) 0 Drag term (pe - pa) 0 Overexpanded Nozzles have pressure losses (drag penalty) Underexpanded Nozzes have gains (thrust contribution) matched condition The highest thrust is generated when nozzle expansion ratio operates such that pe = pa Impulse Total momentum change imparted during a burn Specific Impulse Total Impulse/Weight of propellant Isp A measure of fuel efficiency; a measure of jet speed; a measure of an impulse imparted to a rocket; a measure for burn time for rockets lifting off the ground Chemical Thruster High T/W, Low Isp Electric Thruster Low T/W, High Isp Bipropellant Fuel + oxidizer Monopropellant 1 fuel + catalyst Solid Propellant Biprops with both propellants mixed Hybrid Propellant One propellant liquid, one propellant solid Very High Isp Results in low thrust and therefore low acceleration Isp too low Mp too high Isp too high Mpow too high Electrothermal Thruster Resistojet, Arcject Electrostatic Thruster Ion, Hall, Electrospray, Field Emission Electric Propulsion Electromagnetic Thruster Pulsed Plasma, Magnetoplasmadynamic, Lorentz Force accelerator Rocket Equation delta*V = -cln(mf/mi) where c is jet velocity Mass breakdown initial gross mass = overall structure + propellant + payload Stage All of vehicle begin accelerating by engines