98-Mar-B5 December 2016 Page 9 of 20 QUESTION 7 TURBINE AND COMPRESSOR STAGE LIMITATIONS HUMOR LP compressor HP compress

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98 Mar B5 December 2016 Page 9 Of 20 Question 7 Turbine And Compressor Stage Limitations Humor Lp Compressor Hp Compress 1 (94.61 KiB) Viewed 25 times

98-Mar-B5 December 2016 Page 9 of 20 QUESTION 7 TURBINE AND COMPRESSOR STAGE LIMITATIONS HUMOR LP compressor HP compressor HP and LP Afterburner turbines Rolls-Royce/SNECMA Olympus 593 Mark 610 Afterburning Turbojet The diagram of the gas turbine turbojet engine above shows a high pressure turbine with just one stage driving a high pressure compressor with seven stages and similarly a low pressure turbine also with just one stage driving a low pressure compressor with seven stages. The two turbines drive the respective compressors through separate shafts at different speeds. The diagram is for orientation only and no specific information need be obtained from it. (a) Explain why the compressors require so many stages compared with the turbines for an equivalent transfer of energy. Clarify the limiting factors in compressor design and operation, (4) (b) Explain how with only one stage each the turbines can produce sufficient power to drive the compressors. (4) (c) Explain why the low pressure and high pressure turbine-compressor shafts run at different speeds: LP turbine-compressor shaft speed = 6500 rev/min HP turbine-compressor shaft speed = 8500 rev/min (2) [10 marks ]