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Research Papers: Fundamental Issues and Canonical Flows

Comparison of Large Eddy Simulation and Unsteady Reynolds-Averaged Navier–Stokes for Evaluation of Entropy Noise

[+] Author and Article Information
Eduard Ron

Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK;
Center for Energy Research,
University of California—San Diego,
La Jolla, CA 92093
e-mail: eduardron91@gmail.com

Kam Chana

Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: kam.chana@eng.ox.ac.uk

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 6, 2017; final manuscript received June 14, 2017; published online August 11, 2017. Assoc. Editor: Riccardo Mereu.

J. Fluids Eng 139(11), 111204 (Aug 11, 2017) (8 pages) Paper No: FE-17-1211; doi: 10.1115/1.4037140 History: Received April 06, 2017; Revised June 14, 2017

This paper expands on the numerical simulation of entropy noise by performing a comparison of two commonly used models for resolving turbulent flow field: large eddy simulation (LES) and unsteady Reynolds-averaged Navier–Stokes (URANS). A brand new numerical procedure was developed allowing an accurate reproduction of two-dimensional spatial and temporal temperature variations of a nonuniform temperature profile. Experimental investigation was performed for the same nonuniform temperature profile, and comparison of the entropy noise level measured experimentally and evaluated numerically using the two models was performed. It was shown that large eddy simulation allows a better prediction of entropy noise within the developed numerical procedure than URANS.

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Figures

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Fig. 1

Schematic representation of Oxford Turbine Research Facility

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Fig. 2

Cross section of the EOTDF generator

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Fig. 3

Hardware configuration for the investigated nozzle

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Fig. 4

Radial EOTDF and uniform temperature profile

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Fig. 5

Sound pressure level of the EOTDF and uniform temperature profiles evaluated at the 17th axial Kulite for subsonic flow conditions

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Fig. 6

Spatial temperature variations of the EOTDF temperature profile measured in the OTRF (a) and predicted numerically with LES (b) and URANS (c)

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Fig. 7

Range of the EOTDF temperature variations

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Fig. 8

Temporal temperature variations of the EOTDF temperature profile measured experimentally in the OTRF (a) and predicted numerically using LES (b) and URANS (c)

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Fig. 9

Comparison of isentropic Mach number distribution measured experimentally in the OTRF and evaluated numerically with LES

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Fig. 10

Comparison of sound pressure level evaluated numerically with LES and URANS turbulence models against experimentally measured in the OTRF for the uniform temperature profile

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Fig. 11

Comparison of sound pressure level evaluated numerically with LES and URANS turbulence models against experimentally measured in the OTRF for the EOTDF temperature profile

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Fig. 12

Comparison of fast Fourier transform applied to unsteady temperature fluctuations of the EOTDF temperature profile measured experimentally in the OTRF and predicted numerically with LES and URANS turbulence models

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