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Defects in Turbine Impeller Blades with Non-destructive Testing: Modeling, Ultrasonic Waves, Defect Analysis

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Abstract

The basic defects of turbines in the water, oil and aerospace industries are very obvious. Turbines play a key role by rotating the impeller. In some turbine engines, impellers are used instead of axial compressors, and the impeller play a key role in investigating defects that can increase its performance and life of the turbine. The blades have different dimensions and shapes and are installed on the impeller by bolt and nut connections. The shape, dimensions and number of blades vary depending on the power required. In the present study, corrosion defect on the turbine impeller was performed with one of the non-destructive tests, which was an ultrasonic test. The defect is considered to be corrosion, which occurs mostly in turbines in the oil and water industries, and its examination in non-destructive testing will be an attractive challenge. Corrosion defects occur with work and rotational performance of the impellers long-term. Measuring the diameter by ultrasound, which is a new method in this test, the amount of corrosion will be detected. In this article, 20 turbines with defective blades were tested. The defect was simulated by Comsol software to prove the experimental work. According to various tests about the size of the defect, the new solution can determine the approximate life and efficiency hours of each turbine to a large extent. Diagrams were drawn to determine efficiency hours of each turbine based on rate and size of corrosion diameter, that have effect on defect. The experimental and simulation results were significantly consistent, and size of corrosion diameter was obtained by ultrasound waves that it is a new method in ultrasonic testing.

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  1. Department of Mechanical Engineering, Technical and Vocational University of Iran, P.O.Box 87719-46645, Tehran, Tehran, Iran

    Esmaeil Mirmahdi

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Mirmahdi, E. Defects in Turbine Impeller Blades with Non-destructive Testing: Modeling, Ultrasonic Waves, Defect Analysis. J. Inst. Eng. India Ser. C 102, 1395–1401 (2021). https://doi.org/10.1007/s40032-021-00769-6

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  • DOI: https://doi.org/10.1007/s40032-021-00769-6

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