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Text | Advanced Systems Steam Power Plant | 062
revenue. What is the break-even operating time to recover the cost of this maintenance operation?
9.31 Compare the isentropic efficiencies of two compressors, each having a polytropic efficiency of 87% and pressure ratios of 6 and 18.
9.32 What is the polytropic efficiency of a turbine, with a pressure ratio 30, that has the same isentropic efficiency as a turbine having a polytropic efficiency of 92% at a pressure ratio of 12?
9.33* Compare the performance of a twin-spool turbofan engine with separate fan and compressor to that of a turbojet engine, both with an overall pressure ratio of 30 and a turbine inlet temperature of 1300K, and designed for an altitude of 15,000m and a flight speed of 275 m/s. The bypass ratio is 6 and the fan pressure ratio is 1.6. Assume turbine, fan, and compressor polytropic efficiencies of 90% and a combustor pressure loss of 3% of the compressor exit total pressure. Compare specific thrusts for engines built from the same core engine. Compare, also, specific fuel consumption and jet velocities.
9.34* Build a multicase spreadsheet for the conditions of Exercise 9.33, and use it to plot specific thrust and TSFC as a function of fan pressure ratio. Use the spreadsheet to explore further the influence of varying bypass ratio for a value of fan pressure ratio suggested by your plot. Write a memo discussing briefly the results of your study.
9.35 Develop an analysis for a turbofan engine, sometimes called an aftfan engine, in which the fan is located at the same axial station and directly attached to a low pressure turbine dedicated to driving the fan. The high- pressure turbine drives the compressor, and is located upstream of the fan. The compressor and fan each have their own separate inlets.
9.36 Express the work of a compressor in terms of its inlet temperature and pressure ratio using (a) the isentropic efficiency, and (b) the polytropic efficiency. Equate the relations, and solve for the compressor isentropic efficiency. Compare your result with Equation (9.13).
9.37 Express the work of a turbine in terms of its inlet temperature and pressure ratio using (a) the isentropic efficiency, and (b) the polytropic efficiency. Equate the relations, and solve for the turbine isentropic efficiency. Compare your result with Equation (9.10).
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