Differentiate between impulse turbine and reaction turbine in terms of i) steam velocity ii) pressure drop across moving blades iii) axial thrust.
What is degree of reaction? What do you mean by degree of reaction values zero and one?
In a De Laval turbine, the steam issues from the nozzles with a velocity of 900 m/s. The nozzle angle is 20°. Blade velocity is 350 m/s. The blades are symmetrical. The mass flow rate is 600 kg/min. Friction factor is 0.8. Determine i) blade angles ii) power developed iii) blade efficiency iv) stage efficiency. Consider nozzle efficiency 93%.
What is the difference between blade efficiency and stage efficiency of a turbine? Give expressions for the two.
How the various losses occur in a steam turbine?
For an impulse steam de Laval type, the nozzle having an angle of 16∘16^\circ16∘, delivers 1 kg of steam per sec at a speed of 720 m/s to a set of blades moving at 180 m/s. The blade angle at outlet is 25∘25^\circ25∘ and velocity coefficient is 0.72. Determine (i) blade power, (ii) blade efficiency and (iii) energy lost in the blade.
Why is steam turbine compounded? Explain velocity compounded impulse turbine. Mention its problems.
Differentiate between impulse and reaction steam turbine.
In a De Laval turbine, the steam issues from the nozzles with a velocity of 900 m/s. The nozzle angle is 20∘20^{\circ}20∘, the blade velocity is 350 m/s. The blades are symmetrical. The mass flow rate is 600 kg/min. Friction factor is 0.8. Determine (i) blade angles, (ii) power developed, (iii) blade efficiency and (iv) stage efficiency.
For an impulse steam De Laval type, the nozzle having an angle of 16°, delivers 1 kg of steam per sec at a speed of 720 m/s to a set of blades moving at 180 m/s. The blade angle at outlet is 25° and velocity coefficient is 0.72. Determine (i) blade power, (ii) blade efficiency (iii) energy lost in the blade.
Why are steam turbines compounded? What are the different methods of compounding? How is the numbers of stages of a turbine estimated?
In a De Laval turbine the steam issues from the nozzles with a velocity of 900 m/s. The nozzle angle is 20°. Blade velocity is 350 m/s. The blades are symmetrical. The mass flow rate is 600 kg/min. Friction factor is 0.8. Determine (i) blade angle, (ii) power developed, (iii) blade efficiency, and (iv) stage efficiency if nozzle efficiency is 93%.