# Entropy And The Laws Of Thermodynamics

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Q1) What are the three main scientific concepts regarding the Gas Turbine Engine
1. Entropy and the Laws of Thermodynamics
 Definition:
The first law of thermodynamics states that the total energy of the system is constant and that energy can neither be created nor destroyed and can only transform from one form to another. This means that we can't create noting from something, and we can't create something from nothing. Energy exists and cannot become nonexistent and nonexistent energy cannot become exist. The first law makes use of the key concepts of internal energy, heat, and system work. It is used extensively in the discussion of heat engines.
 Example:
An example of first law of thermodynamics is when a fan is on, the motor heats up;
The gas turbine will first intake of air and possibly fuel, and then Compression of the air and possibly fuel, after that Combustion, where fuel is injected if it was not drawn in with the intake air and burned to convert the stored energy, finally expansion and exhaust, where the converted energy is put to use, which, in turn, propel the airplane. In some modern environments the cycles are described as SUCK, SQUEEZE, BANG, BLOW. Every joule of heat released by combustion of the fuel could be extracted as work at the output shaft. Such an engine would operate at 100 percent efficiency.
2. Newton’s third law of motion
 Definition:
The Newton’s third law states that every action has an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The direction of the force on the first object is opposite to the direction of the force on the second object, thus they balance each other.
 Example:
An example of Newton’s third law is when you sit on a chair; your body exerts a downward force on the surface of the chair, while the chair exerts an equal and upward force on your
Air is a bit different than a fluid although it acts as though it were a fluid through an orifice, meaning that by compressing it tightly, one could compress tiny molecules of air into a very confined area, mix in fuel in its vapor form, and ignite the fuel air mixture. Igniting the fuel and air forces the mixture to covert its stored potential energy into thermal and mechanical energy, turning the rear turbine blades.

Q2) Sketch the Brayton Cycle graph & a High Bypass Turbo Fan (HBTF) & give a description of the work cycle of gas through a HBTF engine at each point.

1) Brayton Cycle

Stage one from point 0 to 3, the air is sent through the intake and moved in the compressor, in which air will get compressed and pressure and temperature of this air will get increased and the volume is decreased. Stage two from point 3 to 4, the air will move to combustion chamber where the fuel is injected and the temperature and entropy rises after combustion. Stage three 4 to 8, the gases expand through the turbines which cause volume to increase and pressure and temperature will both decrease, which will cause turbine to produce thrust and work. At 8 to 0, the air will move out through the exhaust. This cycle is then repeated over and over

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