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02000ME206052001

pressure for a two stage reciprocating air compressor with perfect intercooling.
Compare reciprocating and rotary air compressors.

A single inlet type centrifugal compressor handles 528 kg/min. of air. The
ambient air conditions are 1 bar and 20°C. The compressor runs at 20000 rpm
with isentropic efficiency of 80%. The air is compressed in the compressor from
1 bar static pressure to 4 bar total pressure. The air enters the impeller eye with
a velocity of 145 m/s with no pre-whirl. Assuming that the ratio of whirl speed
to tip speed is 0.9, calculate rise in total temperature during compression if the
change in kinetic energy is negligible, the tip diameter of the impeller, power
required and eye diameter if the hub diameter 12 cm.

Explain the construction and working of an axial flow air compressor.

Define degree of reaction. Discuss the significance of 50% reaction blading.
Explain surging and choking in centrifugal compressors.

Explain the construction and working of roots blower.

TER KK

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