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DESIGN OF MINIATURE TURBOJET ENGINE 19 leading edges facing the combustion chamber (Hunecke, 1997). Their purpose is to reduce the phenomena known as swirl and allow air to accelerate into the turbine blades. The stator directs exhaust gases in the axial direction towards the turbine blades while increasing the absolute velocity and kinetic energy of the exhaust gases. The stator has a similar yet opposite role to that of the diffuser in the compressor stage. In the diffuser, the area between the adjacent blades increase in the downstream direction whereas in the stator this area increases. The stator and turbine must contend with extremely high thermal loads. By raising the turbine inlet temperature, more thrust per unit mass flow rate is generated (Mattingly, 2000). The turbine also operates at extremely high angular velocities. These criteria have driven the development of new materials and cooling techniques used in this stage of the engine. Even small turbine blades can encounter exhaust gases with temperatures in excess of 1000 degrees centigrade while rotating upwards of 100,000 RPM. Due to high pressures, temperatures, and peripheral blade speeds nickel-based super alloys are often used (Mukinutalapati, 2011). These materials must also have high resistance of creep due to their continuous use under these conditions. Various companies have developed Nickel-Chromium super alloys for use in turbine blades. Common trade names for these alloys include: Inconel 625, Altemp 625, and Chronin 625. Examples of a turbine and a stator with housing can be seen in 5.PDF Image | Design and Manufacturing of a Miniature Turbojet Engine
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