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Research Papers: Flows in Complex Systems

Unsteady Behaviors of Steam Flow in a Control Valve With T-Junction Discharge Under the Choked Condition: Detached Eddy Simulation and Proper Orthogonal Decomposition

[+] Author and Article Information
Peng Wang, Hongyu Ma

Key Lab of Education Ministry for
Power Machinery and Engineering,
School of Mechanical Engineering;
Gas Turbine Research Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China

Yingzheng Liu

Key Lab of Education Ministry for
Power Machinery and Engineering,
School of Mechanical Engineering;
Gas Turbine Research Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: yzliu@sjtu.edu.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 29, 2017; final manuscript received January 30, 2018; published online March 29, 2018. Assoc. Editor: Daniel Livescu.

J. Fluids Eng 140(8), 081104 (Mar 29, 2018) (13 pages) Paper No: FE-17-1702; doi: 10.1115/1.4039254 History: Received October 29, 2017; Revised January 30, 2018

Due to the practical space limitation, the control valve in industrial utilities is usually immediately followed by a short flow passage, which would introduce considerable complexity into highly unsteady flow behaviors, along with the flow noise and structure vibration. In the present study, the unsteady behaviors of the steam flow inside a control valve with a T-junction discharge, when the valve operates under the choked condition, are numerically simulated. Toward this end, the detached eddy simulation (DES) is used to capture the spatiotemporally varying flow field in the serpentine flow passage. The results show periodic fluctuations of the aerodynamic forces on the valve spindle and periodic fluctuations of the pressure and flow rate at the two discharge outlets. Subsequently, proper orthogonal decomposition (POD) analysis is conducted using the velocity field and pressure field, identifying, respectively, the dominant coherent structures and energetic pressure fluctuation modes. Finally, the extended-POD method is used to delineate the coupling between the pressure fluctuations with the dominant flow structures superimposed in the highly unsteady flow field. The fourth velocity mode at St = 0.1, which corresponds to the alternating oscillations of the annular wall-attached jet, is determined to cause the periodic flow imbalance at the two discharge outlets, whereas signatures of the first three modes are found to be dissipated in the spherical chamber. Such findings could serve as facts for vibration prediction and optimization design. Particularly, the POD and extended-POD techniques were demonstrated to be effective methodologies for analyzing the highly turbulent flows in engineering fluid mechanics.

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Figures

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Fig. 4

Time-averaged and time-variant flow patterns in the valve passage

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Fig. 3

Plots of wall pressure fluctuations during the numerical simulation

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Fig. 2

Results of the mesh independence test

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Fig. 7

Imbalance of the mass flow rate and pressure in the two outlet pipes of the T-junction discharge: (a) instantaneous mass flow rate (left) and its spectrum (right) and (b) instantaneous pressure (left) and its spectrum (right)

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Fig. 9

Space–time cross-correlation coefficients of the pressure fluctuations along the centerlines of the two outlet pipes of the T-junction

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Fig. 10

Normalized eigenvalue of each POD eigenmode and its cumulative distribution for the pressure field in the valve passage

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Fig. 11

(a) Spatial patterns and (b) the corresponding spectrum of the mode coefficients for the POD modes of the pressure fields in the valve passage

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Fig. 13

(a) Spatial patterns and (b) the corresponding spectrum of the mode coefficients for the POD modes of the velocity fields in the valve passage

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Fig. 14

Streamwise velocity distribution of the reconstructed flow fields with the third velocity mode

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Fig. 1

Schematic representation of the steam control valve with a T-junction discharge

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Fig. 5

Contour plot of the statistical quantities in the valvepassage: (a) Root-mean-square (RMS) of streamwise velocity fluctuations, (b)reverse-flow intermittency, and (c) RMS of pressure fluctuations

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Fig. 6

Spectrum of aerodynamic forces acting on the valve spindle: (a) lateral force fluctuations and (b) axial force fluctuations

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Fig. 8

Comparison of the pressure fields between the two outlet pipes: (a) instantaneous pressure difference and (b) contour plot of the instantaneous pressure distribution

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Fig. 12

Normalized eigenvalue of each POD eigenmode and its cumulative distribution for the velocity field in the valve passage

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Fig. 15

Streamwise velocity distribution of the reconstructed flow fields with the fourth velocity mode

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Fig. 16

Spatial patterns of the extended modes of the pressure fields in the T-junction discharge

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