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TURBO MACHINES Steam and Gas Turbines
Intended Contents
Gas Turbine
The Power Cycle for a Jet Engine
Joule (UK) or Brayton (US) Cycle
Steam Turbine
Rankine or Vapor Cycle
Combined Cycles
Gas Turbine Engine Pressure Ratio
“Classical Thermodynamics is the only physical theory of universal content which …. within the framework of its basic notions, will never be toppled.” Albert Einstein
Global Energy Crisis!!
Do we have an Energy, Enthalpy or an Entropy Crisis?
Freeman Dyson explains Entropy as a "measure of disorder in a physical system".
Another useful thermodynamic quantity in the context of energy conversion is Enthalpy, which is used to quantify the thermal energy content of hot steam.
The energy available from a thermal power system depends on the temperature and pressure of the hot steam entering the turbine.
Gas Turbines
So, what are Gas Turbines?
Popularly called the “GT”
Copperbelt Energy Corporation (CEC) has Rolls-Royce Gas Turbines at Luano Station along Chingola Road.
Gas Turbine Principle
A gas turbine is a rotary machine, similar in principle to a steam turbine.
In an open cycle gas turbine working on Joule cycle, the air is compressed in a rotary compressor and passed into a combustion chamber where fuel is burnt, the products of combustion are then made to impinge over rings of turbine blades with high velocity and work is produced.
“Nature, in providing us with combustibles on all sides, has given us the power to produce, at all times and in all places, heat and the impelling power which is the result of it. To develop this power, to appropriate it to our uses, is the objective of heat engines. The study of these engines is of greatest interest, their importance is enormous, their use is continually increasing, and they seem destined to produce a great revolution in the civilized world.”
Sadi Carnot, Reflection On The Motive Power of Heat And On Machines Fitted To Develop That Power, 1824.