[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 92 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, 0.45 m Impeller exit tip diameter, 0.76 m Slip factor, 0.9 Radial component of velocity at impeller exit, 54 m/s Rotational speed of impeller, 11,000 rev/min Static pressure at impeller exit, 222 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 92 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, 0.45 m Impeller exit tip diameter, 0.76 m Slip factor, 0.9 Radial component of velocity at impeller exit, 54 m/s Rotational speed of impeller, 11,000 rev/min Static pressure at impeller exit, 222 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 Number 5

[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 92 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, 0.45 m Impeller exit tip diameter,
0.76 m Slip factor, 0.9 Radial component of velocity at impeller exit, 54 m/s Rotational
speed of impeller, 11,000 rev/min Static pressure at impeller exit, 222 kPa (abs).

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