The axial flow steam turbine rotor shown in Fig. P12.69 has a blade outer radius \(R_{0}=2.40 \mathrm{ft}\), a blade inner radius \(\mathrm{R}_{i}=\) \(2.00 \mathrm{ft}\), a steam inlet pressure \(p_{1}=200 \mathrm{psia}\), a steam inlet density \(ho_{1}=0.296 \mathrm{lbm} / \mathrm{ft}^{3}\), and an inlet absolute velocity \(V_{1}=1000 \mathrm{ft} / \mathrm{s}\) making an angle of \(70^{\circ}\) with the axial direction. The steam outlet pressure \(p_{2}=50 \mathrm{psia}\) and outlet density is \(0.1014 \mathrm{lbm} / \mathrm{ft}^{3} . \beta_{2}=\) \(40^{\circ}\). The rotor rotates at \(3600 \mathrm{rpm}\). Using a blade velocity at the blade midheight \((R=2.20 \mathrm{ft}\) ), find the power transferred from the steam to the rotor.

Figure P12.69

Transcribed Image Text:

= 20 U U V W A Turbine blade 2 Section AA A V2 W R Ro