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A low-cost, high-temperature radial turbine has been developed that demonstrates the technology required to manufacture a small, cooled turbine using photoetched laminates bonded together to form a complete wheel. An advanced long-life and high-performance turbine design is described which uses an iterative optimization procedure to provide a balanced mechanical and aerodynamic design. The calculated bulk heat-transfer effectiveness was 0.54 with operation at 2300 F over a typical Army helicopter mission of 6000 cycles and with a design life of 5000 hours. Several wheels were manufactured from precision-rolled Astrology sheet. The mechanical integrity was demonstrated in a series of proof tests conducted in a whirlpit test facility including overspeed, growth, and burst tests, a stresscoat test, and a 6000-cycle test at overspeed conditions (119-percent design speed) to establish the low-cycle-fatigue characteristics of this rotor. (Author).
The objective of this program was to provide and demonstrate the technology required to economically manufacture a cooled, high-temperature, radial turbine with sufficient integrity and aerodynamic performance to meet future Army requirements for a reliable, low-cost, high performance, small gas turbine engine. The work to accomplish this objective was subdivided into three phases. (Author).