Figure 2 is a characteristic map of a modern compressor with the working lines for the IP and HP compressors of a triple

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Figure 2 Is A Characteristic Map Of A Modern Compressor With The Working Lines For The Ip And Hp Compressors Of A Triple 1 (247.65 KiB) Viewed 46 times

Figure 2 is a characteristic map of a modern compressor with the working lines for the IP and HP compressors of a triple-spool engine superimposed onto it. ISENTROPIC EFFICIENCY 90% 185% 100 80% Ders Point INT 7:9.70 Normalised 75% IP Line Tot = 6.0 IP Line Toz To4 To2 = 4.0 Toe HP Line SURGELINE PRESSURE RATIO 30 40 HP Lint 100 855 (NIT 'Normalised 201 LO 50%. 70" 80%. 90%. 100% 105% 100% NORMALISED CORRECTED MASS FLOW Figure 2 a) Approximate the pressure ratios and normalized mass flows for T.4/T02 = 4.0 and 6.0 for both working lines in Fig. 2. (4 marks) b) What is the non-dimensional speed (N//T.2) of the engine at the design point? (1 marks) c) Approximate the non-dimensional speed of both IP and HP compressor when then T4/To2 is decreased from the design point to 4.0. (2 marks) d) Would it be safe for the engine to be running at T04/To2 = 4.0? (3 marks)