Research Papers

Characteristics of Turbulence in a Turbofan Stage

[+] Author and Article Information
Jeremy Maunus

Graduate Research Assistant

Sheryl Grace

Associate Professor
e-mail: sgrace@bu.edu

Douglas Sondak

Scientific Programmer
e-mail: sondak@bu.edu

Victor Yakhot

e-mail: vy@bu.edu
Department of Mechanical Engineering,
Boston University,
Boston, MA 02215

1Present address: Project Engineering, General Compression, 274 Washington St. Suite 210, Newton, MA 02458.

2Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received December 27, 2010; final manuscript received January 25, 2012; published online November 8, 2012. Editor: David Wisler.

J. Turbomach 135(2), 021024 (Nov 08, 2012) (10 pages) Paper No: TURBO-10-1232; doi: 10.1115/1.4006774 History: Received December 27, 2010; Revised January 25, 2012

Two-equation turbulence models are commonly used in the simulation of turbomachinery flow fields, but there are limited experimental data available to validate the resulting turbulence quantities. Experimental measurements are available from NASA’s Source Diagnostic Test (SDT), a 1/5th scale model representation of the bypass stage of a turbofan engine. Detailed unsteady hot-wire anemometer data were taken at two axial locations between the rotor and fan exit guide vanes (FEGVs). Here, an accurate and consistent procedure is used to obtain the turbulent kinetic energy, dissipation rate, and integral length scale from structure functions calculated using the SDT data. These results are compared to the solutions provided by four proprietary CFD codes that employ two-equation turbulence models. The simulations are shown to predict the turbulent kinetic energy and length scale reasonably well as well as the trend in mean dissipation. The actual mean dissipation rates differ by nearly two orders of magnitude due to a difference in interpretation between the classical definition and what is used in CFD.

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Fig. 1

Source diagnostic test

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Fig. 2

Average passage streamwise mean velocities (ft/s)

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Fig. 3

Midspan passagewise root mean square velocities (ft/s)

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Fig. 4

Radial distribution of mean square velocities (ft2/s2)

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Fig. 5

Midspan second-order structure functions (ft2/s2)

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Fig. 6

Midspan passagewise mean dissipation rate (ft2/s3)

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Fig. 7

Radial distribution of mean dissipation rate (ft2/s3)

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Fig. 8

Radial distribution of circumferentially averaged integral length scale (in.)

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Fig. 9

Calculation of Cɛ and passagewise distribution of Λ1

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Fig. 10

Passagewise distribution of normalized streamwise velocity

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Fig. 11

Radial distributions of turbulent kinetic energy, dissipation rate, and length scale

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Fig. 12

Passagewise distributions of turbulent kinetic energy, dissipation rate, and length scale




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