ATTACHMENT : century; however the projected specific impulse gains are on the order of 107.. The nonconventional systems offer specific impulse gains of hundreds of percent but involve larger risks and, possibly, higher costs and longer lead times. Development programs will improve the efficiencies, versatility, and payload capabilities of liquid propulsion systems (e.g. the advanced RL10 system using liquid H and 0 ) and solid rocket systems (e.g. the IUS system of motors). These advances are extremely important since each percentage point increase in propulsion system efficiency can yield significantly larger increases in payload weight in GEO. In particular, typical LEO payloads for subsequent trips to GEO are 50 - 807. propulsion and fuel. Further improvements in chemical systems (e.g. replacing 0 with F , using metal hydrides) should be achievable in the next decade. In addition, advances in refrigeration to permit long term (or even indefinite) storage of H will provide additional options for both propulsion and power. Solid propulsion systems are expected to take advantage of new energetic ingredients (e.g. more energetic binders, burning rate control). Thus the Air Force is continuing basic research on specific aspects of chemical propulsion. However, with respect to propulsion, the primary emphasis of the FY83 initiative will be on ATTACHMENT : nonconventional propulsion. Consistent with the theme of the meeting, the discussions that follow tend to emphasize those propulsion concepts requiring megawatts of electric power. Title: Brayton cycle power conversion for space Source: Proceedings of the AFOSR Special Conference on Prime-Power for High Energy Space Systems, Norfolk, Virginia, USA, Feb. 22-25, 1982. (Paper No. V-l) Authors: Parker, G. H.; <Westinghouse Electric Corporation, Advanced Energy Systems Di vision> Date: 02-22-82 Classification: u Keywords: space energy conversion, al ternative systems Abstract: As a spinoff from jet engine technology, closed gas turbine (Brayton) cycles also have a strong technology base. A wealth of design and testing experience exists for all critical components. Compact configurations ranging from a few kW(e) (DOE sponsored) to tens of MW(e) (ONR sponsored) have been designed. Title: Nuclear powered organic Rankine systems for space applications Source: Proceedings of the AFOSR Special Conference on Prime—Power for High Energy Space Systems, Norfolk, Virginia, USA, Feb. 22-25, 1982. (Paper No. V-3) Authors: <Sundstrand Energy Systems> Date: 02-22-82 Classification: u Keywords: nuclear, alternative systems, space energy conversion Abstract: Organic Rankine Cycle (ORC) experience and its technology base are briefly discussed. The Dynamic Isotope Power System (DIPS) and its current status is reviewed. The characteristics and attributes of the ORC system are presented along with a discussion on the compatibility with different heat ATTACHMENT : sources. System weights are given for isotope and reactor systems. System reliability is enhanced by redundant power conversion systems and a heat pipe radiator.
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