What is steam turbine and its function?
A steam turbine is a machine that extracts thermal energy from pressurized steam and uses it to do mechanical work on a rotating output shaft, possibly using a renewable energy heat source. Its modern manifestation was invented by Charles Parsons in 1884.
How does a steam turbine operate?
As the name implies, a steam turbine is powered by steam. As hot, gaseous steam flows past the turbine’ spinning blades, steam expands and cools, giving off most of the energy it contains. This steam spins the blades continuously. The blades thus convert most of the steam’s potential energy into kinetic energy.
What is the main function of a turbine?
Briefly, the purpose of a turbine is to convert the available energy into the fluid that enters it to generate electrical energy. In its conception, the turbine expands the fluid that enters it, decreasing its pressure – or even, decreasing its internal energy2.
What are the 3 stages of turbine?
In modern turbines, three types of staging are employed, either separately or in combination: (1) pressure (or impulse) staging, (2) reaction staging, and (3) velocity-compound staging.
What is steam turbine stage?
In a steam turbine impulse stage, energy is extracted at constant pressure while the velocity of the steam falls as it flows across the blades. The steam is then expanded through a stationary control stage to increase its velocity again before energy is extracted from another set of impulse blades.
Which is the operating cycle of turbine?
In an ideal gas turbine, gases undergo four thermodynamic processes: an isentropic compression, an isobaric (constant pressure) combustion, an isentropic expansion and heat rejection. Together, these make up the Brayton cycle.
What are stages in turbine?
How do you start of steam turbine?
– Start the gland steam condenser fan unit. 15. – Provided both lubricating and control oil pressure is established the startup sequence may continue at a steady even acceleration rate of approximately 300 rpm to normal running speed. – Checks should continue to be made on oil pressure, temperature and vibration readings.
What are the stages of a steam turbine?
Based on Steam Movement. On the basis of steam speed,these are classified into different types,which include the following.
What is the working principle of steam turbine?
– The steam energy is converted Mechanical work by expansion through turbine. – Expansion take place through a series of fixed and moving blades. – In each row, fixed blade and moving blade are called stage.
Why steam turbines are preferred over steam engines?
The superheated steam entering the turbine loses its pressure (enthalpy) moving through the blades of the rotors, and the rotors move the shaft to which they are connected. Steam turbines deliver power at a smooth, constant rate, and the thermal efficiency of a steam turbine is higher than that of a reciprocating engine.