Aeronautic and automotive turbines are normally manufactured starting from high quality casts using 5 axis milling processes. The machining requires precise machines and accurate CN control, to obtain complex shape parts. The materials range from light alloys in the automotive compressor, to steel and finally superalloys (like Inconel
The turbo charger for automotive application exploits the energy of the exhaust gas to make turning a disk turbine connected with a disk compressor that force the fresh air in the cylinder chamber. The amount of fuel that can be burned per cycle increase proportionally with the increase of the air molecules available in the combustion chamber, leading to an obvious increase of energy generated during the combustion process, as so the power accordingly.
Resonant vibrations of turbine blades requires thicker and aerodynamically lower performing blade designs, increasing the engine weight and the inertia of rotating parts, leading to higher fuel consumption. High performance rotating blades are subject to high cycle fatigue (HCF) limitations as a result of high vibratory stresses. A better damping of the turbine and compressor blisks could lead to 20% lighter parts, reducing the inertia of the same amount and so reducing all the negative effects of the turbo lag.