Research Papers: Internal Combustion Engines

The Twisted-Blade Model for Radial-Turbine Mistuning

[+] Author and Article Information
Valentina Futoryanova

Dynamics and Vibration Group,
Department of Engineering,
University of Cambridge,
Cambridge CB2 1PZ, UK
e-mail: vf211@cam.ac.uk

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 2, 2017; final manuscript received January 24, 2017; published online April 4, 2017. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(8), 082803 (Apr 04, 2017) (8 pages) Paper No: GTP-17-1002; doi: 10.1115/1.4035914 History: Received January 02, 2017; Revised January 24, 2017

One of the common failure modes of the diesel-engine turbochargers is the high-cycle fatigue (HCF) of the turbine-wheel blades. Mistuning of the blades due to the casting process is believed to contribute to this failure mode. Currently available commercial finite-element software requires high computational capacity to model statistical mistuning. The objective is to develop a simple model tailored for the evaluation of statistical mistuning in diesel-engine turbocharger turbine wheels that can be used in the product design stage. This research focuses on the radial turbine-wheel design that is typically used in 6–12 L diesel-engine applications. A continuous twisted-blade model is developed in matlab using finite element techniques. The model is tested and validated against different symmetrical cases as well as abaqus results.

Copyright © 2017 by ASME
Topics: Turbines , Blades , Wheels
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Fig. 1

Twisted-blade model element definition with 6DOF

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Fig. 2

Finite elements hub (left) and blade (right) assembly

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Fig. 3

Blade-position angle γ and blade-twist angle α

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Fig. 4

Hub-design optimization based on the mass ratio variation of circular and radial hub elements

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Fig. 5

Bar chart of different hub options for the first eight modes of vibration

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Fig. 6

Four-bladed paddle-wheel bending mode shapes

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Fig. 7

Hub nodes amplitude response to blade impact

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Fig. 8

Twisted-blade model compared with Euler beam theoretical calculation for cantilever beam

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Fig. 9

Cantilever bending modes mode shapes

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Fig. 10

Twisted-cantilever bending mode shapes corrected for twist

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Fig. 11

Beam assumptions compared with abaqus frequencies

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Fig. 12

Paddle wheel with short blades and Timoshenko beam elements compared with abaqus frequencies

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Fig. 13

Comparison of abaqus and TBM with Carnegie

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Fig. 14

Tapered-blade frequency and number of elements used

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Fig. 15

Comparing twisted-blade model with the theory for blade taper predictions




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