Steady state stress analysis was carried out on a typical automotive turbocharger centrifugal compressor impeller using the finite element method and the concept of cyclic symmetry. Since the rotational speed of the impeller is very high and the size of the impeller is quite small, experimental verification of the stresses is extremely difficult. A novel method of measuring the radial growth of the impeller tip has been presented and a suitable instrumentation was designed and developed. This paper describes the numerical and experimental work carried out on a centrifugal compressor impeller

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Stress analysis and determination of eigen pairs of a typical turbocharger compressor impeller have been carried out using the concept of cyclic symmetry. A simplified model treating the blade and the hub as isolated elements has also been attempted. The limitations of the simplified model have been brought out. The results of the finite element model using the cyclic symmetric approach have been discussed.

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