Small, Low Cost, High Performance Engines for Miniature Munitions

"We propose to design and develop a turbine-driven fan module that will attach to the exhaust duct of an expendable turbojet converting it into an aft-fan turbofan. Depending upon selected bypass ratio, thrust can be increased as much as 70% and TSFC canbe reduced more than 50%. The complete fan unit would weigh roughly 4-5 lbs and provide significant increase in range and/or mission duration. Design will be similar to the GE CF-700 and to an aft-fan module that M-DOT designed for the Army for theAllison-Rolls Model 150 turbojet. The Army augmenter design is scalable to roughly 44% of its current size to be under 6 inches diameter. In Phase I, mission requirements and core engine data will be obtained. Trade studies of throttle settings,bypass ratios and fan pressure ratios will be conducted and a design point selected. Flowpath geometry will be created. The existing Army augmentor will be used as a baseline for preliminary hardware design and creation of a cross-sectional layout.Weight and production cost will be estimated. At Phase I conclusion, a preliminary design will exist that can be structurally analyzed in detail, fabricated and tested in Phase II. This program will yield a heavy-fueled propulsion system with a significant improvement in TSFC over existing turbojets. This system will have application on any small powered UAV or munition and could improve performance of MALD, LOCAAS, Bird-Dog andother small UAVs an