(root) and outer (tip) diameters of the eye region are 0.15 and 0.3 m, respectively. Use y=1.4 and Cp=1 kJ/(kg K) for this problem.
⚫ The impeller tip diameter is 0.5 m and its height is 0.05 m.
• The impeller rotates at a speed N = 200 (rev/s).
0.63π • There are a total of 12 impeller blades, where the slip factor σ = 1- , and n power input factor, , is 1.04.
• The overall isentropic efficiency is nc=0.95.
• Pressure and temperature (both static) measured at the impeller tip (station 2) are T2=400 K and P2=400 kPa, respectively.
(a) Determine the radial velocity and tangential velocity exiting from the impeller tip.
(b) Determine the stagnation temperature out of the diffuser To3.
(c) Determine the overall pressure ratio, Poз/Po1.
(d) Estimate the axial Mach number entering the eye region (use P₁= 100 kPa and To1=300 K regardless what you have found earlier). One iteration will be sufficient to estimate the density/temperature.