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An experimental investigation of a low-pressure turbine blade suction surface using a shear and stress sensitive film

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Abstract

A shear and stress sensitive film (S3F) is employed on the suction surface of an industry standard low-pressure turbine blade. These tests address the optimization of S3F for low-speed air investigations on a curved surface, and are the first measurements of its kind. S3F provides all three stress components on a surface in a single measurement, and is based on 3D elastic deformations of a polymeric film. A detailed description of the S3F technique is presented along with proof of concept experiments, followed by the turbine results which illustrate the need for separate films tailored for the local stress levels in each area. Oil–film verification of stresses is also included.

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Abbreviations

c :

chord length

C f :

skin friction coefficient

dC p :

change in pressure coefficient, \({\rm d}C_{\rm p}=\frac{{\rm d}P}{0.5\,mU^2}\)

G :

Green’s functions of influence

h :

film thickness

m :

density of air

Re :

Reynold's number, \(Re=\frac{Uc}{\nu}\)

S :

contact surface

u :

displacement fields

U :

characteristic velocity

η :

dynamic viscosity of oil

ε :

deformation tensor

λ :

Lame constant, \(\lambda=\frac{2\mu \nu}{1-2\nu}\)

μ :

shear modulus of elasticity

ν :

Poisson ratio

ρ :

S3F density

τ :

shear stress

θ :

volume deformation

x :

streamwise direction

y :

surface-normal direction

z :

cross-stream direction

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Acknowledgments

The first author wishes to thank the Dayton Area Graduate Studies Institute for financial support. All authors would like to thank Andrew Lethander and Chris Murphy of AFRL for their assistance with the rapid prototyping of the LPT blade, and Grant Jones of ISSI for assistance with the S3F formulation.

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Authors and Affiliations

  1. Mechanical and Materials Engineering, Wright State University, 3640 Colonel Glenn Hwy, Dayton, OH, 45435, USA

    Mark McQuilling & Mitch Wolff

  2. Innovative Scientific Solutions, Inc., 2766 Indian Ripple Road, Dayton, OH, 45440, USA

    Sergey Fonov & Jim Crafton

  3. Turbines Branch, Propulsion Directorate, Air Force Research Laboratory, 1950 Fifth St., WPAFB, Dayton, OH, 45433, USA

    Rolf Sondergaard

Authors
  1. Mark McQuilling
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  2. Mitch Wolff
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  3. Sergey Fonov
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  4. Jim Crafton
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  5. Rolf Sondergaard
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Correspondence to Mark McQuilling.

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McQuilling, M., Wolff, M., Fonov, S. et al. An experimental investigation of a low-pressure turbine blade suction surface using a shear and stress sensitive film. Exp Fluids 44, 73–88 (2008). https://doi.org/10.1007/s00348-007-0375-2

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  • DOI: https://doi.org/10.1007/s00348-007-0375-2

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