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Thermodynamics

Question:

An axial flow compressor stage has blade root,mean and tip velocities of 150,200 and 250 m/s. The stage is to be designed for a stagnation temperature rise of 20K andaxial velocity of 150 m/s, both constant from root to tip. The work-done factor is 0.93. Assuming %50 reaction at mean radius, calculate the stage air angles at root?

Answers

An axial flow compressor stage has blade root,mean and tip velocities of 150,200 and 250 m/s. The stage is to be designed for a stagnation temperaturerise of 20K and axial velocity of 150 m/s, both constant from root to tip. The work-done factor is 0.93. Assuming %50 reaction at mean radius,calculate the stage air angles at root? Assume constant work input at all radii.

(a1= 17.04° (= b2), b1= 45.75° (= a2) at mean radius; a1=13.77°,

b1= 54.88°, b2 =40.36°, a2= 39.34° at tip; a1=22.10°,

b1= 30.71°, b2 =-19.95°, a2= 53.74° at root)

.

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