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Isentropic Efficiency - Turbomachinery Aerodynamics - Lecture Slides, Slides of Turbomachinery

Indian Institute of Tourism and Travel ManagementTurbomachinery

Some concept of Turbomachinery Aerodynamics are Axial Flow Compressors, Axial Turbine Design Considerations, Blade Performance, Engine Performance Significantly, Flows Through Axial Compresso. Main points of this lecture are: Isentropic Efficiency, Axial Flow, Flow Compressor, Compressor, Outlet Angles, Reaction Design, Done Factor, Axial Flow, Mass Flow Rate, Blade Angles

Typology: Slides

2012/2013

Uploaded on 04/27/2013

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Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay 20
Lect-5
Exercise Problem # 1
•An axial flow compressor of 50 percent
reaction design has blades with inlet and
outlet angles at 45oand 10orespectively.
The compressor is to produce a pressure
ratio of 6:1 with overall isentropic efficiency
of 0.85 when inlet static temperature is
37oC. The blade speed and axial velocity are
constant throughout the compressor.
Assuming a value of 200 m/s for blade
speed. Find the number of stages required if
the work done factor is (a) unity and (b)
0.87.
•Ans: (a) 8 (b) 9
pf3
pf4
pf5

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Exercise Problem # 1

  • An axial flow compressor of 50 percent

reaction design has blades with inlet and

outlet angles at 45 o^ and 10 o^ respectively.

The compressor is to produce a pressure

ratio of 6:1 with overall isentropic efficiency

of 0.85 when inlet static temperature is

37 o^ C. The blade speed and axial velocity are

constant throughout the compressor.

Assuming a value of 200 m/s for blade

speed. Find the number of stages required if

the work done factor is (a) unity and (b)

  • Ans: (a) 8 (b) 9

Exercise Problem # 2

 Air at 1 bar and 288 K enters an axial flow compressor stage with an axial velocity of 150 m/s. There are no inlet guide vanes. The rotor has a tip diameter of 60 cm and a hub diameter of 50 cm and rotates at 100 rps. The air enters the rotor and leaves the stator with no change in velocity or radius. The air is turned through 30 o^ as it passes through the rotor. Determine (a) the blade angles (b) mass flow rate (c) power required and (d) the degree of reaction.

 Ans: (a) 49 o, 19 o^ (b) 14.38 kg/s © 300.7 kW (d) 0.

Exercise Problem # 4

 A 50% reaction axial flow compressor has inlet

and outlet blade angles of 45 o^ and 12 o, respectively. The blade speed at the tip of the rotor is 320 m/s. If the inlet total temperature is 300 K, determine the tip relative Mach number.

 Ans: 1.

Exercise Problem # 5

 A 10 stage axial flow compressor develops

an overall pressure ratio of 8.0 with and

isentropic efficiency of 0.85. The absolute

velocity component of air enters the rotor at

an angle of 27 o^ to the axial direction. The

axial component of velocity is constant

throughout the compressor and is equal to

150 m/s. If the ambient air conditions are

15 o^ C and 1 bar, determine the angle which

the relative component of velocity makes

with the axial direction at the exit of the

rotor.

 Ans: 14o