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376 Figure 9.31 presents some of the nomenclature and notation that will be used in discussing the turbofan engine. For the configuration shown in the figure, the fan pressurizes the compressor inlet air as well as delivering the power needed to accelerate the bypass air through its nozzle downstream. While other fan configur- ations are possible, this frequently used arrangement is the only one analyzed here. In addition to the bypass ratio, a second important design parameter is the fan pressure ratio, the ratio of the stagnation pressure downstream to that upstream of the fan: FPR = po2/po1 [dl] (9.15) The fan pressure ratio, together with the bypass ratio, determines the power transferred between the hot core engine and the bypass flow. For a given core engine configuration, higher bypass ratios and fan pressure ratios cause more power to be extracted from the turbine and passed to the bypass air by the fan. This produces higher bypass duct thrust. However, as more power is extracted from the core flow, the core nozzle velocity and core engine thrust are reduced. The determination of the design values of these parameters therefore involves a complex tradeoff with numerous other design factors. The combination of a compressor and a turbine joined by a shaft is sometimes referred to as a spool. High-pressure-ratio engines are frequently arranged in a twin-spool or even a three-spool configuration. In a twin-spool engine, a high- pressure turbine drives a high-pressure compressor with a hollow shaft, and a low- pressure turbine delivers power to a low-pressure compressor and/or a fan by means of a shaft that turns inside of the high-pressure-spool shaft. The turbofan configuration in Figure 9.31 has the low-pressure turbine driving both the fan andPDF Image | Advanced Systems Steam Power Plant
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