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Research Papers: Flows in Complex Systems

Investigation of Vortical Structures and Turbulence Characteristics in Corner Separation in a Linear Compressor Cascade Using DDES

[+] Author and Article Information
Yangwei Liu

Collaborative Innovation Center
of Advanced Aero-Engine;
National Key Laboratory of Science
and Technology on Aero-Engine
Aero-Thermodynamics,
School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: liuyangwei@126.com

Hao Yan

Collaborative Innovation Center
of Advanced Aero-Engine;
National Key Laboratory of Science and
Technology on Aero-Engine
Aero-Thermodynamics,
School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China;
Xi'an Aerospace Propulsion Institute,
Xi'an 710100, China
e-mail: yanhaovsdami@163.com

Lipeng Lu

Collaborative Innovation Center
of Advanced Aero-Engine;
National Key Laboratory of Science
and Technology on Aero-Engine
Aero-Thermodynamics,
School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: lulp@buaa.edu.cn

Qiushi Li

Collaborative Innovation Center
of Advanced Aero-Engine;
National Key Laboratory of Science and
Technology on Aero-Engine
Aero-Thermodynamics,
School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: liqs@buaa.edu.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received February 3, 2016; final manuscript received September 12, 2016; published online December 7, 2016. Assoc. Editor: Kwang-Yong Kim.

J. Fluids Eng 139(2), 021107 (Dec 07, 2016) (14 pages) Paper No: FE-16-1075; doi: 10.1115/1.4034871 History: Received February 03, 2016; Revised September 12, 2016

Three-dimensional (3D) corner separation in a linear highly loaded compressor cascade is studied by using delayed detached-eddy simulation (DDES) method. This paper studies the flow mechanism of corner separation, including vortical structures and turbulence characteristics. The vortical structures are analyzed and the distributions of Reynolds stresses and turbulent anisotropy are also discussed in detail. The results show that there exist different kinds of vortical structures, such as horseshoe vortex, passage vortex, wake shedding vortex, and “corner vortex.” Before the corner separation forms, the passage vortex becomes the main secondary vortex and obviously enhances the corner separation. At approximate 35% chord position, the corner vortex begins to form, enlarges rapidly, and dominates the secondary flow in the cascade. The corner vortex is a compound vortex with its vortex core composed of multiple vortices. Streamwise normal Reynolds stress contributes greatest to the turbulence fluctuation in the corner region. The turbulence develops from two-dimensional (2D) turbulence in the near-wall region to one-component type turbulence in the corner region. The turbulence tends to be more anisotropic when the flow is close to the endwall within the corner separation region.

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References

Figures

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Fig. 2

Mesh of PVD cascade: (a) point distribution of blade to blade and (b) topology

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Fig. 1

Pictorial view of prescribed velocity distribution (PVD) cascade [7,15]

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Fig. 9

Isosurface of Q=5000

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Fig. 10

Time-averaged velocity and streamline in S3 plane at different chord positions: (a) 35%, (b) 50%, (c) 70%, and (d) 90%

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Fig. 3

Velocity profile at inlet

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Fig. 4

Time-averaged pressure coefficient at 54% span

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Fig. 5

Time-averaged pressure coefficient at 89% span

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Fig. 6

Pitchwise mass-averaged total pressure loss at 50.0% chord downstream

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Fig. 7

One-dimensional frequency spectra of velocity fluctuations at P2 in Fig. 8: (a) frequency spectra of velocity and (b) velocity fluctuation

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Fig. 8

Location of monitor points

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Fig. 11

Isosurface of Q=100,000

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Fig. 12

Streamwise vorticity magnitude and streamline at the trailing edge of the blade: (a) contour of streamwise vorticity magnitude and (b) streamwise vorticity magnitude and streamline at slice of dashed rectangle in (a)

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Fig. 13

Isosurface Q=2,000,000 at several instantaneous cases

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Fig. 14

Pressure spectra of three monitor points

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Fig. 15

Shear strain rate

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Fig. 16

Turbulent kinetic energy at 80% chord

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Fig. 17

Reynolds stress at 80% chord: (a) 〈u′u′〉, (b) 〈v′v′〉, (c) 〈w′w′〉, (d) 〈u′v′〉, (e) 〈u′w′〉, and (f) 〈v′w′〉

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Fig. 18

Normal Reynolds stress: (a) 10% span, (b) 20% span, and (c) 30% span

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Fig. 19

Shear Reynolds stress: (a) 10% span, (b) 20% span, and (c) 30% span

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Fig. 21

Distribution of points from the extracted lines in anisotropy invariant map at 30% span: (a) no. 1, (b) no. 2, (c) no. 3, and (d) no. 4

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Fig. 22

Distribution of points from the extracted lines in anisotropy invariant map at 20% span: (a) no. 1, (b) no. 2, (c) no. 3, and (d) no. 4

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Fig. 23

Distribution of points from the extracted lines in anisotropy invariant map at 10% span: (a) no. 1, (b) no. 2, (c) no. 3, and (d) no. 4

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Fig. 20

Anisotropy invariant map (a) and position of lines with velocity vectors extracted at 30% span (b), 20% span (c), and 10% span (d)

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