Problem #1: A centrifugal compressor has a mass flow rate of 1.6 kg/s while rotating at 11,000 rpm. The impellor is a radial imp
ellor meaning that the blades are strictly radial at exit (β2' = 0). The radius of the radial impeller at exit is 0.3 m with a blade width 0.01 m. Assume that the entrance flow is axial. For this compressor, the compressor efficiency is 83% and the slip coefficient is 0.9. (a) Clearly sketch the velocity triangles at the exit of the impellor. Include the flow slip and mark all the angles and velocities.
1 answer:
Answer:
a) The slip coefficient is 0.9
b) Blade tip speed is 345.57 m/s
c) Stagnation temperature exiting the impellor is 416.84 k
d) Exit flow velocity is 84.88 m/s
e) Exit flow angle is 76.2°
f) Exit static temperature is 353.84 k
g) Impellor exit Mach number is 0.943
Explanation:
Flow at entry is axial α₁ = 0
Tagential velocity at entry = 0
Blade at exit is radial β₂ = 0
μ₂ =
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Answer:
When water is surrounding T_s = 34.17 degree C
When air surrounding T_S = 1434.7 degree C
from above calculation we can conclude that air is less effective than water as heat transfer agent
Explanation:
Given data:
length = 300 mm
Outer diameter = 30 mm
Dissipated energy = 2 kw = 2000 w
Heat transfer coefficient IN WATER = 5000 W/m^2 K
Heat transfer coefficient in air = 50 W/m^2 K
we know that
From newton law of coding we have
is surface temp.
T - temperature at surrounding
solving for[/tex] T_s [/tex] w have
When air is surrounding we have
from above calculation we can conclude that air is less effective than water as heat transfer agent