0
Research Papers

Influence of Turbocharger Turbine Blade Geometry on Vibratory Blade Stresses

[+] Author and Article Information
Pavan Naik

Continental Automotive GmbH,
Regensburg 93055, Germany
e-mail: pavan.naik@continental-corporation.com

Bernhard Lehmayr, Stefan Homeier, Michael Klaus

Continental Automotive GmbH,
Regensburg 93055, Germany

Damian M. Vogt

ITSM—Institute of Thermal Turbomachinery
and Machinery Laboratory,
University of Stuttgart,
Stuttgart 70569, Germany
e-mail: damian.vogt@itsm.uni-stuttgart.de

1Corresponding author.

Manuscript received June 29, 2018; final manuscript received July 24, 2018; published online October 4, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(2), 021015 (Oct 04, 2018) (9 pages) Paper No: GTP-18-1404; doi: 10.1115/1.4041152 History: Received June 29, 2018; Revised July 24, 2018

In this paper, a method to influence the vibratory blade stresses of mixed flow turbocharger turbine blade by varying the local blade thickness in spanwise direction is presented. Such variations have an influence on both the static and the vibratory stresses and therefore can be used for optimizing components with respect to high-cycle fatigue (HCF) tolerance. Two typical cyclic loadings that are of concern to turbocharger manufacturers have been taken into account. These loadings arise from the centrifugal forces and from blade vibrations. The objective of optimization in this study is to minimize combined effects of centrifugal and vibratory stresses on turbine blade HCF and moment of inertia. Here, the conventional turbine blade design with trapezoidal thickness profile is taken as baseline design. The thicknesses are varied at four spanwise equally spaced planes and three streamwise planes to observe their effects on static and vibratory stresses. The summation of both the stresses is referred to as combined stress. In order to ensure comparability among the studied design variants, a generic and constant excitation order-dependent pressure field is used at a specific location on blade. The results show that the locations of static and vibratory stresses, and hence the magnitude of the combined stresses, can be influenced by varying the blade thicknesses while maintaining the same eigenfrequencies. By shifting the maximum vibratory stresses farther away from the maximum static stresses, the combined stresses can be reduced considerably, which leads to improved HCF tolerance.

Copyright © 2019 by ASME
Your Session has timed out. Please sign back in to continue.

References

Rodgers, C. , 1968, “ Paper 5: A Cycle Analysis Technique for Small Gas Turbines,” Proc. Inst. Mech. Eng., Conf. Proc., 183(14), pp. 37–49.
Chou, C.-C. , and Gibbs, C. A. , 1989, “ The Design and Testing of a Mixed-Flow Turbine for Turbochargers,” SAE Paper No. 890644.
Abidat, M. , 1991, “ Design and Testing of a Highly Loaded Mixed Flow Turbine,” Ph.D thesis, University of London, London.
Khairuddin, U. , Costall, A. W. , and Martinez-Botas, R. F. , 2015, “ Influence of Geometrical Parameters on Aerodynamic Optimization of a Mixed-Flow Turbocharger Turbine,” ASME Paper No. GT2015-42053.
Mueller, L. , Alsalihi, Z. , and Verstraete, T. , 2012, “ Multidisciplinary Optimization of a Turbocharger Radial Turbine,” ASME J. Turbomach., 135(2), p. 021022. [CrossRef]
Smith, W. , and Wilkins, C. S. B. , 2016, “ An Improved Approach to HCF Development for Vaneless Turbine Stages,” iMechE Paper No. C6231-164.
Klaus, M. , 2007, “ Strömungsinduzierte Schaufelschwingungen in Radialturbinen Mit Beschaufeltem Spiralgehäuse,” Ph.D. thesis, Universität Karlsruhe (TH), Karlsruhe, Germany.
Farin, G. , 2014, Curves and Surfaces for Computer-Aided Geometric Design: A Practical Guide, Elsevier Science, Boston, MA.
Drozdowski, R. , 2011, “ Berechnung Der Schwingbeanspruchungen in Radialturbinenrädern Unter Berücksichtigung Realer Bauteilgeometrien,” Ph.D. thesis, TU Dresden, Dresden, Germany.
Wilson, A. U. T. , 1993, “ Turbine Blade Dynamics and Blade-Vane Interaction in a Radial Inflow Turbine,” AGARD Conference Proceedings AGARD CP, Vol. 537, pp. 35–1–35–11.
Myhre, M. , 2003, “ Numerical Investigation of the Sensitivity of Forced Response Characteristics of Bladed Disks to Mistuning,” Ph.D. thesis, KTH, Energy Technology, Stockholm, Sweden.
Piersol, A. , and Paez, T. , 2009, Harris' Shock and Vibration Handbook, McGraw-Hill handbooks, McGraw-Hill Education, New York.
Dynardo GmbH, 2016, “ Methods for Multi-Disciplinary Optimization and Robustness Analysis,” Dynardo GmbH User Manual, Dynardo GmbH, Weimar, Germany.

Figures

Grahic Jump Location
Fig. 1

Interdependence of design parameters

Grahic Jump Location
Fig. 2

Location of maximum stresses

Grahic Jump Location
Fig. 3

Simulation process

Grahic Jump Location
Fig. 4

CFD model for URANS simulations

Grahic Jump Location
Fig. 5

Blade mesh for CFD simulations

Grahic Jump Location
Fig. 6

Two-dimensional blade profile showing planes and points for DOE sampling

Grahic Jump Location
Fig. 7

Streamwise blade thickness points

Grahic Jump Location
Fig. 8

Spanwise blade thickness points

Grahic Jump Location
Fig. 10

Generic load application points

Grahic Jump Location
Fig. 11

Load factors at different locations of blade

Grahic Jump Location
Fig. 12

Temperature profile over blade surface

Grahic Jump Location
Fig. 13

Schematic representation of MAC variation

Grahic Jump Location
Fig. 14

Correlation coefficients of static stresses on blade

Grahic Jump Location
Fig. 15

Correlation coefficients of vibratory stresses on blade

Grahic Jump Location
Fig. 16

Correlation coefficients of total stress on blade

Grahic Jump Location
Fig. 17

Haigh diagram representing stresses inhibited by design set

Grahic Jump Location
Fig. 18

Correlation coefficients of moment of inertia

Grahic Jump Location
Fig. 19

Blade thickness variations

Grahic Jump Location
Fig. 20

Design comparison for total stresses

Grahic Jump Location
Fig. 21

Design comparison for moment of inertia

Grahic Jump Location
Fig. 22

Design comparison for reduced mass flow

Grahic Jump Location
Fig. 23

Design comparison for turbine efficiency

Grahic Jump Location
Fig. 24

Anthill plot representing the influence of distance of maximum vibratory stress location from blade hub

Grahic Jump Location
Fig. 25

Modal assurance criterion—distributions

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In