Question 16.SP.11: Assume the Francis turbine of Sample Prob. 16.6 is operating......
Assume the Francis turbine of Sample Prob. 16.6 is operating at maximum efficiency. Find the specific speed of the turbine and estimate the diameter of its runner.
Step-by-Step
Eq. (16.21): \quad N_{s}=\left(\frac{n_{e} \sqrt{\mathrm{bhp}}}{h^{5 / 4}}\right)_{\eta_{\max }}=\frac{300 \sqrt{1125}}{97.2^{5 / 4}}=33.0 \quad
From Fig. 16.14: \quad \phi_{e}=0.72
Eq. (16.20): \quad D=\frac{153.3(0.72) \sqrt{97.2}}{300}=3.63 \mathrm{ft} \quad
N_s=\left(\frac{n_e \sqrt{\mathrm{bh} \mathrm{p}}}{h^{5 / 4}}\right)_{\eta_{\max }} ( 6.21)
D=\frac{153.3 \phi_e \sqrt{h}}{n} (6.20)
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