Solve an impulse turbine problem given V1, alpha1, U, blade exit angle phi2, and blade friction loss.

let's solve this impulse turbine problem.

Given:
Absolute velocity of steam at inlet, $V_1 = 600 \text{ m/s}$
Nozzle angle (angle of $V_1$ to the plane of rotation), $\alpha_1 = 30^\circ$
Mean blade speed, $U = 300 \text{ m/s}$
Exit angle of the blades, $\phi_2 = 40^\circ$
Loss in relative velocity due to friction in the blade = $15\%$, so $V_{r2} = (1 - 0.15) V_{r1} = 0.85 V_{r1}$.

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