Q6. The total throat area of the nozzles of a simple impulse turbine is 3000 mm2. The nozzles are convergent/divergent in form, and flow is choked. Steam enters the nozzles at a pressure of 10 bar and a temperature of 400°C, and expands isentropically according to the law pV1.3 = constant. The mean blade ring diameter is 1 m and the speed of rotation is 9365 rev/min. The blades are symmetrical with a blade angle of 36°. The blade velocity coefficient is 1, and steam leaves the blades in an axial direction. Determine EACH of the following:
(a) The mass flow rate of steam
(b) The blade power
(c) The nozzle angle
(d) The nozzle exit pressure.
pc = po × (2/(n + 1))n/n-1; Vc = Vo × ((n + 1)/2)1/n-1;a = √npv
Approximate relations for the isentropic expansion of steam, quoted in the Steam
Tables, may be used as appropriate.
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