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03000 ME364052101

efficiencies of the fan and drive are 82% and 88% respectively. The radial
velocity remains constant and has a value of 0.202. The velocity at the inlet eye
is 0.402. If the blower handles 200 m°/min of air at the entry conditions,
determine:
(a) power required by the electric motor,
(b) impeller outer diameter,
(c) inner diameter of the blade ring,
(d) blade angle at entry,
(e) impeller widths at entry and exit
Draw the velocity triangles for the different types of impeller design in a
centrifugal fan.

Vw

For a centrifugal compressor, Prove that R = 1 - where R is degree of
2

reaction, ‏)ص۷‎ is the whirl velocity component at the exit and wz is the vane
velocity in tangential direction.
What is surging phenomenon. With the help of performance characteristic
curve, explain surging in a compressor.
Draw the enthalpy-entropy diagram of a centrifugal compressor stage
With the help of velocity triangle, explain the significance of slip in a
centrifugal compressor.
PART ட

Answer any four full questions, each carries 10 marks.
Draw the velocity triangle for an axial flow compressor stage.
With the help of neat diagram explain the distribution of pressure and velocity
in a stage of an axial flow compressor.

Explain rotating stall.

For an axial flow compressor, prove that ಗ = 1 — = (tan ०८२- tan ०८1) where
நீர is flow velocity perpendicular to vane velocity, R is degree of reaction, प is
the vane velocity in tangential direction, x, and ०] are the inlet guide vane

angle.

Explain positive incidence flow separation with a neat diagram.

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