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384 inner fan-turbine blades, rear fairing, and tailcone assembly, is cantilevered at the rear of the engine and rotates counterclockwise. With unducted-fan engines, very high bypass ratios are possible. The UDF engine, with an overall pressure ratio of approximately 42 at top of climb, has demonstrated substantial SFC reductions over modern turbo fans, approximately 20% lower than the best of the current turbofan engines. In-cabin noise, originally expected to be a problem with unducted fans, was very low–equal to or less than that of today’s turbofan-powered aircraft (ref. 55). Despite the attractiveness of the unducted fan concept, it appears that in the next decade large transport aircraft will use ducted fans that incorporate more modest increases in bypass ratio together with increases in overall pressure ratio for improved performance. Reference 63, for example, anticipated the family of 75,000 to 95,000 pounds-thrust turbofans coming into use around 1995. They were expected to have a bypass ratio of 9 and overall pressure ratio about 45 to give a 9% improvement in SFC over then-existing engines. The reference anticipated that the engines would have a low speed, low pressure ratio fan for low noise. The fans were expected to be made of composite materials to save about 25% weight over competing metal fans. Bibliography and References 1. Curran, Paul F., "Clean Power at Cool Water," Mechanical Engineering, Vol. 109, No. 8 (August 1987): 68-71. 2. Grover, Ralph W., et al.; "Preliminary Environmental Monitoring Results for The Cool Water Coal Gasification Program." Proceedings of the EPRI Sixth Annual Conference on Coal Gasification, Palo Alto, Calif., October 15–16, 1986. 3. Watts, Donald H., Dinkel, Paul W., and McDaniel, John E., "Cool Water IGCC Performance to Date and its Future in the Electric Utility Industry," U.S. Utility Symposium, Palm Springs, Calif., October 1987. 4. Gluckman, Michael J., et al., "A Reconciliation of the Cool Water IGCC Plant Performance and Cost Data with Equivalent Projections for a Mature 360-MW Commercial IGCC Facility." Cool Water Gasification Program, October 1987. 5. Fahrion, M. E., "Materials Development Experience at Cool Water Coal Gasification Plant." Cool Water Coal Gasification Program, October 1987. 6. Anon., "Boilers and Auxiliary Equipment," Power, June 1988: 91–229. 7. Ehrlich, Shelton, "Fluidized-Combustion Boiler Technology–1988 Update." Missouri Valley Electric Association Engineering Conference, Kansas City, Mo., March 1988. 8. Ehrlich, Shelton, "Fluidized Combustion: Is It Achieving Its Promise?" Electric Power Research Institute, Palo Alto, Calif.PDF Image | Advanced Systems Steam Power Plant
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