A simple single-stage axial turbine is being designed to produce power from water flowing through a tube as in Fig. P14–88. We approximate both the stator and rotor as thin (bent sheet metal). The 16 stator (upstream) blades have b_sl = 0° and b_st = 50.3°, where subscripts “sl” and “st” mean stator leading edge and stator trailing edge, respectively. At design conditions, the axial flow speed is 8.31 m/s, the rotor turns at 360 rpm, and it is desired that there be no swirl downstream of the turbine. At a radius of 0.324 m, calculate angles b_rl and b_rt (rotor leading and trailing edge angles), sketch what the rotor vanes should look like, and specify how many rotor vanes there should be.

FIGURE P14–88

Transcribed Image Text:

in Hub and Generator Stator wr ???---- Rotor Bst out