Materials Essay

539 WordsOct 17, 20133 Pages
Engineering Materials. Compressor Wheel. Gabdullina Alina Sembayev Darmen Since the power a piston engine can produce is directly dependent upon the mass of air it can ingest, the purpose of forced induction is to increase the inlet manifold pressure and density so as to make the cylinders ingest a greater mass of air during each intake stroke. In turbochargers the torque is transmitted from the turbine wheel to the compressor wheel. For commercially used turbocharger, the connection between compressor wheel and shaft is established by a clamped connection. This method of clamping is widely used and well established. The compressor increases the mass of intake air entering the combustion chamber. The compressor side of a turbocharger faces its own challenges. In most applications, the compressor is ingesting air at slightly more than ambient temperature, but the temperature rise across the compressor can be substantial. Data from the simulation of M11. Temperature of inlet air - 173.32°C Pressure of inlet air - 2.15 bars Parts of the centrifugal compressor: 1. Impeller 2. Diffuser 3. Volute Housing 1. Material properties of compressor wheel: 1. Physical properties: We should have low density, because of rotating parts, F=m*a, mass should be low, for easier rotation of the wheel, not to spend a lot of force. 2. Mechanical properties: a. Tension High tension ability, because of requirement in high force value. b. Compression High compression ability, it is in contrast with the tension, if we have high tension, we will have high compression. c. Strain Low strain ability. If we look on formula of strain, which is ratio between change in length and original length, we see that we don't want to have a big change in length, that's why strain ability should be low. d. Stiffness High stiffness ability, by using formula of stiffness

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