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Flow characteristics of an automotive compressor with an additively manufactured rotor disc

Andrearczyk Artur

Archives of Thermodynamics

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2021

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Vol. 42, no 1

3--13

EN

This paper presents the results of experimental research regarding the determination of the flow characteristics of the compressor of an automotive turbocharger with a plastic rotor disc. The disc was manufactured using the 3D printing technology called the multijet printing, which allows complex geometries to be printed with high precision. Currently, in addition to speeding up the manufacturing processes and reducing their costs, 3D printing technologies are increasingly seen as standard tools that can be used in the design and optimization of machine parts. This article is a continuation of research on the possibility of applying additively manufactured elements in turbomachines. The experimental research was carried out at high rotational speeds (up to 110 000 rpm), using the automotive turbocharger with two different compressor rotors (i.e. one aluminum and one polymer). The first chapters of the paper discuss the preparation stage of the research (i.e. the manufacture of the rotor, the test rig). Then, the experimental research and the flow characteristics are described. The results obtained for the two types of discs were compared with each other and the area of application of the additively manufactured rotor was determined. The rotor functioned properly in the range of tested operating parameters and the results obtained showed that the technology and material applied could be used in the optimization studies of the blade systems of high-speed fluid-flow machines.

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Vibration analysis of a turbocharger with an additively manufactured compressor wheel

Andrearczyk Artur, Bagiński Paweł

Zeszyty Naukowe. Transport / Politechnika Śląska

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2020

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z. 107

05--17

EN

This article presents the vibration analysis of a turbocharger, whose compression wheel was manufactured using a high-precision additive manufacturing technology. Currently, there are advance studies around the world for the development of parts of innovative fluid-flow machines using additive manufacturing techniques. The experimental research was carried out under conditions of reduced flow temperatures. The tests and the analysis were performed on a wheel manufactured using a 3D printing technology and on a conventionally used aluminium wheel. Apart from an FFT analysis of the vibration signal during machine operation, a machine run-up test was conducted (up to a speed of 105,000 rpm). The results showed the positive impact of the use of a plastic wheel on the dynamics of the system at a certain speed range, which might contribute to the development of a new method to optimise the geometry of flow systems in small high-speed turbomachines. A modified automotive turbocharger was subjected to experiments on a test stand.

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Low cycle fatigue prediction of the aluminium alloy compresor wheel

Brumek J., Strnadel B.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2007

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Vol. 321, z. 89

89-89

EN

This paper is devoted to give a brief review of the mechanism proceeding cracks initiation in the fatigue process in the compressor wheel. Finite element analysis has been used to calculate triaxial stresses. Alternating and mean stresses of each sub cycle where calculated in each direction and Sines’ methodology was used to convert triaxial stress to an equivalent uniaxial stress. Damage caused by each sub cycle found using test bar S-N curve. Total life was found using Miner’s rule.