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Launch Vehicle and Spacecraft System Design



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AIAA 2004 6130 Space 2004 Conference and Exhibit 28 30 September 2004 San Diego California Launch Vehicle and Spacecraft System Design Using the Pistonless Pump Steve Harrington Ph D San Diego State University Flometrics Inc Solana Beach CA 92075 The application of a pistonless pump to a launch vehicle or spacecraft can provide cost and reliability improvements over standard pressure fed or turbopump fed designs Calculations show that in a first stage launch vehicle application a system which uses the pistonless pump has comparable performance to gas generator turbopump designs The performance can be improved by using low pressure liquid helium which is pumped using a pistonless pump to high pressure and then heated at the engine This allows for lower pressurant tankage weight This system uses less than 1 of the fuel mass in liquid helium which offers a performance advantage over comparable gas generator turbopump powered rockets A complete overall vehicle design is presented which shows how the various systems are integrated and how much each component weighs The vehicle uses LOX hydrocarbon propellants at moderate to high pressures to achieve high performance at low weight and low cost The pump is also shown to have significant performance and flexibility increases for spacecraft when combined with high pressure storable propellant engines The pistonless pump is also applicable to pumping gelled propellants Nomenclature a b c g Isp K M P0 Pe Ru f c c T Tcycle Ve W factor for portion of vehicle mass proportional to payload factor for portion of vehicle mass proportional to propellant mass factor for portion of vehicle mass proportional to propellant mass time chamber pressure acceleration of gravity specific impulse pump design efficiency Currently 5 average molecular weight of combustion products Chamber Pressure External ambient pressure universal gas constant average propellant density pump chamber material density pump chamber material acceptable design stress



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