Question 6.36: (a) Why is drum type construction preferred to disc type con...
(a) Why is drum type construction preferred to disc type construction in reaction turbine ?
(b) Why is partial admission of steam adopted for H.P. impulse stages while full admission is essential for any stage of a reaction turbine ?
(c) In a 50% reaction turbine, the speed of rotation of a blade group is 3000 r.p.m. with mean blade velocity of 120 m/s. The velocity ratio is 0.8 and the exit angle of the blades is 20°. If the mean blade height is 30 mm, calculate the total steam flow rate through the turbine. Neglect the effect of blade edge thickness of the annular area but consider 10% of the total steam flow rate as the tip leakage loss. The mean condition of steam in that blade group is found to be 2.7 bar and 0.95 dry.
(d) What do you mean by once through boilder ? (AMIE Summer, 1998)
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