5. An experimental centrifugal compressor is fitted with free-vortex guide vanes in order to reduce the relative air speed at inlet to the impeller. At the outer radius of the eye. air leaving the guide-vanes has a velocity of 91.5 m/s at 20 deg to the axial direction. Determine the inlet relative Mach number, assuming frictionless flow through the guide vanes, and the impeller total-to-total efficiency. Other details of the compressor and its operating conditions are: Impeller entry tip diameter. 0.457 m Impeller exit tip diameter. 0.762 m Slip factor 0.9 Radial component of velocity at impeller exit. 53.4m/s Rotational speed of impeller. 11 000 rev/min Static pressure at impeller exit. 223 kPa (abs.)

5. An experimental centrifugal compressor is fitted with free-vortex guide vanes in order to reduce the relative air speed at inlet to the impeller. At the outer radius of the eye. air leaving the guide-vanes has a velocity of 91.5 m/s at 20 deg to the axial direction. Determine the inlet relative Mach number, assuming frictionless flow through the guide vanes, and the impeller total-to-total efficiency. Other details of the compressor and its operating conditions are: Impeller entry tip diameter. 0.457 m Impeller exit tip diameter. 0.762 m Slip factor 0.9 Radial component of velocity at impeller exit. 53.4m/s Rotational speed of impeller. 11 000 rev/min Static pressure at impeller exit. 223 kPa (abs.)

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

5. An experimental centrifugal compressor is fitted with free-vortex guide vanes in order to reduce the
relative air speed at inlet to the impeller. At the outer radius of the eye. air leaving the guide-vanes has a
velocity of 91.5 m/s at 20 deg to the axial direction. Determine the inlet relative Mach number, assuming
frictionless flow through the guide vanes, and the impeller total-to-total efficiency.
Other details of the compressor and its operating conditions are:
Impeller entry tip diameter. 0.457 m Impeller exit tip diameter. 0.762 m Slip factor 0.9
Radial component of velocity at impeller exit. 53.4m/s Rotational speed of impeller. 11 000 rev/min Static
pressure at impeller exit. 223 kPa (abs.)

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