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Unformatted text preview: in the axial compressor of the
industrial gas turbine are close coupled, making intercooling
very impractical. To cool the air in such compressors and to
reduce the compression power, it is proposed to spray water
mist with drop size on the order of 5 microns into the air stream
as it is compressed and to cool the air continuously as the water
evaporates. Although the collision of water droplets with turbine blades is a concern, experience with steam turbines indicates that they can cope with water droplet concentrations of
up to 14 percent. Assuming air is compressed isentropically at
a rate of 2 kg/s from 300 K and 100 kPa to 1200 kPa and the
water is injected at a temperature of 20°C at a rate of 0.2 kg/s,
determine the reduction in the exit temperature of the compressed air and the compressor power saved. Assume the water
vaporizes completely before leaving the compressor, and assume an average mass flow rate of 2.1 kg/s throughout the
7–91 Reconsider Prob. 7–90. The...
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- Spring '09