Origin of the safety features


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Mechanical drive applications of Gas turbines

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The scope of gas turbines is not limited to aerodynamic uses but can also be extended for industrial purposes as well. These industrial gas turbines are designed such that they can be operated in varying climatic conditions ranging from the arctic cold to desert heat. SGT-A30RB Aeroderivative  The first class of industrial gas turbines are the aeroderivative turbines. As the name suggests, these are aircraft derived gas turbines. They include the same components as that of aircraft turbines with minor modifications so that they can include a wide range of liquid and gas fuels. They operate at an efficiency of 45% which indicates an increase of 15% compared to heavy duty gas turbines. They are light weight and utilize advanced materials for improved efficiency. They are multi shaft so that the mechanical components can operate at their optimal speed. SGT700 Industrial  The second class are the heavy duty gas turbines or frame turbines. They are heavy weight and ar...
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All about Brayton

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The thermodynamics behind the functioning of the gas turbines is the Brayton cycle. This cycle consists of four processes which may be closed or open. In a closed cycle, the working fluid is circulated within the system after a complete cycle as in the case of steam turbines. In open cycle, the working fluid enters at the inlet and leaves at the exhaust of the cycle as observed in the cast of turbojets and turbofans. The cycle consists of 2 isobaric (constant pressure) and isentropic (constant entropy) processes. The following processes occur in the gas turbine:    1. Isentropic compression (1-2)    2. Isobaric addition of heat (2-3)    3. Isentropic expansion (3-4)    4. Isobaric removal of heat (4-1) Brayton cycle for P-V and T-s diagrams However, compression and expansion processes do not occur in isentropic manner, increasing the compression ratios is the most effective way to increase the output of Brayton cycle. This fig...
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Materials used in Turbine blades

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There has been a wide range of materials used for the manufacturing of gas turbine blades. It is one of the most important parts in a gas turbine and any deterioration of it will affect the performance and efficiency of the turbine and most importantly will damage the turbine.  Many materials have been tested and used but the most preferred materials include steel, titanium, Nickel based super alloys and ceramics. The first stage of the compressor is very delicate as it is subjected to a very high temperature of approx. 1400-1500 degree celsius.  This part of the turbine should tolerate high temperatures, high pressures, high thermal stresses including creep and fatigue, vibrations which can influence it's performance. The first stage uses Udimet 500, Nickel based super alloy Inconel 738 or GTD 111.  The relatively cold stages of the turbine employ titanium as there are chances of it igniting when used above 500 degree celsius.      ...
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