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- W1489795742 abstract "This chapter focuses on axial-flow turbines that are the most widely employed turbines using a compressible fluid. Axial-flow turbines power most of the gas turbine units and they are more efficient than radial-inflow turbines in most operational ranges. They are also used in steam turbine design; however, there are some significant differences between the axial-flow turbine design for a gas turbine and the design for a steam turbine. Axial-flow turbines are now designed with a high work factor to obtain lower fuel consumption and reduce the noise from the turbine. Lower fuel consumption and lower noise requires the design of higher by-pass ratio engines, and a high by-pass ratio engine in turn requires various turbine stages to drive the high-flow, low-speed fan. The flow in axial-flow turbines enters and leaves in the axial direction. There are two types of axial turbines: impulse type and reaction type. Most axial flow turbines consist of more than one stage. The front stages are usually impulse (zero reaction) and the later stages have about 50% reaction. The impulse stages produce about twice the output of a comparable 50% reaction stage, while the efficiency of an impulse stage is less than that of a 50% reaction stage. The high temperatures that are available in the turbine section have resulted from the improvements of the metallurgy of the blades in the turbines. Development of directionally solidified blades as well as the new single-crystal blades, with the new coating cooling schemes, is responsible for the increase in firing temperatures. The high pressure ratio in the compressor also causes the cooling air used in the first stages of the turbine to become hot." @default.
- W1489795742 created "2016-06-24" @default.
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- W1489795742 date "2012-01-01" @default.
- W1489795742 modified "2023-09-27" @default.
- W1489795742 title "Axial-Flow Turbines" @default.
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- W1489795742 doi "https://doi.org/10.1016/b978-0-12-383842-1.00009-3" @default.
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