3.21) An axial flow compressor has an overall pressure ratio of 4.0 and mass flow of 3 kg/s. If the polytropic efficiency is 0.88 and the stagnation temperature rise per stage must not exceed 25 K, calculate the number of stages required and the pressure ratio of the first stage. Assume equal temperature rise in all stages. If the absolute velocity approaching the 1st stage rotor is 165 m/s at an angle of 20° from the axial direction, the work done factor is 0.83, the velocity diagram is symmetrical, and the mean diameter of the 1st stage rotor is 18 cm, calculate the rotational speed and the length of the 1st stage rotor blade at inlet to the stage. Ambient conditions are 1.01 bar and 288 K. [7,1.273, 356 rev/s, 19.45 cm]

3.21) An axial flow compressor has an overall pressure ratio of 4.0 and mass flow of 3 kg/s. If the polytropic efficiency is 0.88 and the stagnation temperature rise per stage must not exceed 25 K, calculate the number of stages required and the pressure ratio of the first stage. Assume equal temperature rise in all stages. If the absolute velocity approaching the 1st stage rotor is 165 m/s at an angle of 20° from the axial direction, the work done factor is 0.83, the velocity diagram is symmetrical, and the mean diameter of the 1st stage rotor is 18 cm, calculate the rotational speed and the length of the 1st stage rotor blade at inlet to the stage. Ambient conditions are 1.01 bar and 288 K. [7,1.273, 356 rev/s, 19.45 cm]

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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Question

3.21) An axial flow compressor has an overall pressure ratio of 4.0 and mass flow of 3 kg/s. If the
polytropic efficiency is 0.88 and the stagnation temperature rise per stage must not exceed 25 K,
calculate the number of stages required and the pressure ratio of the first stage. Assume equal
temperature rise in all stages.
If the absolute velocity approaching the 1st stage rotor is 165 m/s at an angle of 20° from the axial
direction, the work done factor is 0.83, the velocity diagram is symmetrical, and the mean diameter
of the 1st stage rotor is 18 cm, calculate the rotational speed and the length of the 1st stage rotor
blade at inlet to the stage.
Ambient conditions are 1.01 bar and 288 K.
[7,1.273, 356 rev/s, 19.45 cm]

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