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LUID MECH & THERMODYNAMICS, 6e, S.L. Dixon, C.A. Hall (The answer is available in Chegg, but I do

LUID MECH & THERMODYNAMICS, 6e, S.L. Dixon, C.A. Hall (The answer is available in Chegg, but I do

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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CHAPTER  3 - 6

BOOK: FLUID MECH & THERMODYNAMICS, 6e, S.L. Dixon, C.A. Hall

(The answer is available in Chegg, but I don't have an account for that. Thanks)

6. (a) Show that the pressure rise coefficient C, = Ap/( pc;) of an incompressible compressor cas- cade is related to the total pressure loss coefficient by the following expression: Cp =1- (sec?a, + 5)/sec?a¡, Š = Apo/ where a1, a2=flow angles at cascade inlet and outlet. (b) Determine a suitable maximum inlet flow angle of a low speed compressor cascade having a space-chord ratio 0.8 and a2 =30° when the diffusion factor DF is limited to 0.6. The defini- tion of diffusion factor that should be used is the early Lieblein formula (1959): cos ɑj 1- cos a2 cos aj (tan a1 – tan a2). DF = (c) The stagnation pressure loss derived from flow measurements on this cascade is 149 Pa when the inlet velocity c1 is 100 m/s at an air density p of 1.2 kg/m³. Determine the values of (i) pressure rise and (ii) drag and lift coefficients.
Transcribed Image Text:6. (a) Show that the pressure rise coefficient C, = Ap/( pc;) of an incompressible compressor cas- cade is related to the total pressure loss coefficient by the following expression: Cp =1- (sec?a, + 5)/sec?a¡, Š = Apo/ where a1, a2=flow angles at cascade inlet and outlet. (b) Determine a suitable maximum inlet flow angle of a low speed compressor cascade having a space-chord ratio 0.8 and a2 =30° when the diffusion factor DF is limited to 0.6. The defini- tion of diffusion factor that should be used is the early Lieblein formula (1959): cos ɑj 1- cos a2 cos aj (tan a1 – tan a2). DF = (c) The stagnation pressure loss derived from flow measurements on this cascade is 149 Pa when the inlet velocity c1 is 100 m/s at an air density p of 1.2 kg/m³. Determine the values of (i) pressure rise and (ii) drag and lift coefficients.
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