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Analysis of the impact of impeller geometry on the turbulent statistics inside a fan-stirred, cylindrical flame speed vessel using PIV

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Abstract

Turbulence statistics of three impellers with different geometric features were measured using particle image velocimetry inside a Plexiglas model (~1:1 scale) of a cylindrical flame speed vessel (30.5 cm ID × 35.6 cm L). With four impellers arranged in a central-symmetric configuration, turbulence intensities between 1.2 and 1.7 m/s with negligible mean flow (0.1u′) were attained at the lowest fan speeds. Acceptable ranges for homogeneity and isotropy ratios of the velocity fields were set within a narrow bandwidth near unity (0.9–1.1). Homogeneity ratios were unaffected by changes to the impeller geometry, and the prototype with the higher number of blades caused the flow to become anisotropic. The integral length scale of the flow fields varied between 27 and 20 mm, which correlates well with those typically observed inside a gas turbine combustor. The mechanism to independently vary the intensity level and the integral length scale was established, where turbulence intensity level was dependent on the rotational speed of the fan, and the integral length scale decreased with increasing blade pitch angle.

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Acknowledgments

The authors would like to thank Dr. Rodney Bowersox and Dr. R.A.Humble, Department of Aerospace Engineering, Texas A&M University, for providing the PIV system. The financial support from the U.S. Department of Energy through the UTSR grant No. DE-FE0004679 is acknowledged. S.J. Peltier would like to acknowledge the support from the U.S. Air Force Office of Scientific Research.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Texas A&M University, College Station, TX, 77843-3123, USA

    Sankaranarayanan Ravi & Eric L. Petersen

  2. Department of Aerospace Engineering, Texas A&M University, College Station, TX, 77843-3141, USA

    Scott J. Peltier

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  1. Sankaranarayanan Ravi
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  2. Scott J. Peltier
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  3. Eric L. Petersen
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Correspondence to Sankaranarayanan Ravi.

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Ravi, S., Peltier, S.J. & Petersen, E.L. Analysis of the impact of impeller geometry on the turbulent statistics inside a fan-stirred, cylindrical flame speed vessel using PIV. Exp Fluids 54, 1424 (2013). https://doi.org/10.1007/s00348-012-1424-z

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  • DOI: https://doi.org/10.1007/s00348-012-1424-z

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