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Establish Engine Performance Data
The discussion in this section generates the available installed thrust and fuel-flow graphs matched for the worked-out, sized-aircraft examples (see Chapter 11): a Bizjet and an AJT. In addition, the performance data for a 1,140-shp turboprop engine are provided for readers to work out the associated aircraft performance.
Because the given sfc graphs are based on uninstalled thrust, the fuel-flow rates are computed using uninstalled thrust. Installation loss at cruise is approximately half the percentage loss at takeoff.
13.3.1 Turbofan Engine (BPR < 4)
Figures 10.45 through 10.47 provide the typical uninstalled turbofan thrust in nondimensional form in terms of TsLs, along with the corresponding sfc for the Bizjet aircraft class. Section 11.6 establishes the requirement of an uninstalled matched TsLs_UNINSTALLED = 3,560 lb per engine. Worked out herein and summarized in Table 13.1 are examples of installed thrust and fuel flows for the three engine ratings. The data are sufficient for the example used in this book; intermediate values may be interpolated linearly.
