The invention of internal combustion engines at the beginning of the 19th century led to the discovery of the use of cheap energy, oil, which which allowed the world to develop and progress towards the modern world. Today. Humans were able to accomplish more work with little manual labor, using internal combustion engines powered by fossil fuels. Internal combustion engines are mechanical power devices that convert thermal energy into mechanical energy, with the combustion process occurring within the boundaries of a system (Rolle, 2005). Among the internal combustion engines invented in the 19th century were the Otto engine, the diesel engine, and the gas turbine engine. The gas turbine engine is one of the most widely used engines today due to its high torque to weight ratio compared to other types of internal combustion engines. As explained by Cengel and Boles (2011), the gas turbine engine operates in a 6-stage process, namely air intake, compression, fuel injection, combustion, expansion and l exhaust (see figure 1 in appendix 1). Firstly, the gas turbine engine operation begins with the air intake process. As with any internal combustion engine, oxygen is necessary to sustain the combustion of the fuel and the source of oxygen comes from the fresh air drawn in. Initially, the fan is rotated by a drive shaft driven by the engine turbine. engine. A negative pressure or vacuum on the inlet side is then created by the rotating fan. Then, ambient air is drawn into the inlet and causes it to flow into the inlet of the gas turbine engine (Cengel & Boles, 2011). At the same time, the pressure on the other side of the fan increases because it is compressed to a lower pressure ratio and causes the air on the outlet side of the fan to move toward the middle of the paper. ....operation.Works CitedCengel, YA and Boles, MA (2011). Thermodynamics: an engineering approach (7th ed.). New York, NY: McGraw-Hill.¬¬¬¬Ganesan, V. (1999). Gas turbines. New Delhi, India: Tata McGraw-Hill.Rolle, K.C. (2005). Thermodynamics and thermal power (6th ed.). Upper Saddle River, NJ: Prentice Hall. Saravanamutto, HIH, Rogers, GFC, Cohen, H. and Straznicky, PV (2009). Gas Turbine Theory (6th ed.). London, United Kingdom: Prentice Hall. Sirignano, W.A. and Liu, F. (1999). Increased performance of a gas turbine engine through combustion inside the turbine. Journal of Propulsion and Power, 15(1), 111-118.Walsh, PP and Fletcher, P. (2004). Gas Turbine Performance (2nd ed.). Oxford, UK: Blackwell. Wilson, D.G. and Korakianitis, T. (1998). The Design of High-Efficiency Turbomachines and Gas Turbines (2nd ed.). Upper Saddle River, New Jersey: Prentice Hall.