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Journal of Visualization

, Volume 20, Issue 4, pp 817–832 | Cite as

Secondary flow visualization on stagnation row of a combined impingement and film cooled high-pressure gas turbine nozzle guide vane using PIV technique

  • Pol Reddy KukutlaEmail author
  • B. V. S. S. S. Prasad
Regular Paper

Abstract

In this study, the local jet velocity distribution for a combined impingement and film cooled high-pressure nozzle guide vane system was analyzed, using flow visualization and PIV-assisted measurement. The measurements including flow visualization were performed on the stagnation row of an NGV to understand its complex flow pattern. PIV technique was used to measure the effused coolant jet exit velocity field in two-dimensional vertical planes. The computations were performed by ANSYS FLUENT 14.5 SOLVER using shear stress transport (SST) k-ω turbulence model. Three laboratory test cases that correspond to inlet coolant mass flow rates of 0.0032, 0.0045 and 0.0054 kg/s, at the region of an FIT, were studied. The numerical results for the spanwise coolant velocity at stagnation row of the film holes agreed well with the PIV experimental data on the same vane configuration.

Graphical Abstract

Keywords

PIV FIT NGV CFD Combined impingement and film cooling 

List of symbols

FIT

Front impingement tube

PIV

Particle image velocimetry

d

Film hole diameter, m

Vj

Jet exit velocity, m/s

\(\dot{m}_{\text{c}}\)

Coolant mass flow rate supplied at the plenum, kg/s

A

Cross-sectional area, m2

Notes

Acknowledgements

This work was carried out at the I. C. Engines Laboratory, Department of Mechanical Engineering, IIT Madras and hence I would like to express my indebted thanks to Dr. T. N. C. Anand, Asst Professor and Head of the Lab, Department of Mechanical Engineering, IIT Madras, for allowing me to do the PIV experiments and guiding the PIV-related concepts and knowledge. Further authors extend their sincere thanks to the co-scholars; Mr. S. Radha Krishnan, Mr. Sumith and Mr. Shafeer Ambatt for their valuable contribution in developing the PIV experimental setup for the cooled NGV and support extended while doing the PIV measurements and data processing.

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Copyright information

© The Visualization Society of Japan 2017

Authors and Affiliations

  • Pol Reddy Kukutla
    • 1
    Email author
  • B. V. S. S. S. Prasad
    • 1
    • 2
  1. 1.Turbomachines Laboratory, Department of Mechanical EngineeringIndian Institute of Technology MadrasChennaiIndia
  2. 2.Dept. of Mechanical EngineeringIndian Institute of Technology MadrasChennaiIndia

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