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Research Papers: Flows in Complex Systems

Experimental Study of Flow Structure Characteristics for a T-Junction Duct With Horizontal Vanes

[+] Author and Article Information
Shicong Li, Xiaoyu Wang, Jing He

School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China

Mei Lin

School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: janeylinm@mail.xjtu.edu.cn

Hanbing Ke

Science and Technology on Thermal Energy and
Power Laboratory,
Wuhan 430205, China

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 13, 2019; final manuscript received May 15, 2019; published online June 20, 2019. Assoc. Editor: Timothy Lee.

J. Fluids Eng 141(11), 111111 (Jun 20, 2019) (14 pages) Paper No: FE-19-1027; doi: 10.1115/1.4043803 History: Received January 13, 2019; Revised May 15, 2019

An experimental study is carried out to investigate the flow characteristics of the trailing edge of the horizontal vanes mounted at the branch entrance of a T-junction duct by means of particle image velocimetry (PIV). The measured region starts at the trailing edge of the vanes and ends at about 1.26D (hydraulic diameter) length at downstream of the branch duct. The velocity field is obtained across a number of vertical height planes (z/D = ±0.2, 0, and −0.4) under different flow conditions (cross velocity: uc = 30–50 m/s; velocity ratio: R = 0.08–0.18). The instantaneous flow results show that Kelvin-like vortices with counter-clockwise direction appear at the heights of z/D = ±0.2 and 0, and that a separation bubble is formed at the upper wall of the branch duct at the same heights, respectively. As for near wall z/D = −0.4, one large vortex is observed at the downstream channel, but the separation bubble vanishes as the branching Reynolds number is increased to 3.6 × 104. The time-average flow field is slightly different from that of instantaneous flow field. In addition, the vorticity distribution indicates that two significant vortex sheet layers with negative and positive values are found at the high velocity ratio or high cross velocity, and the normalized vorticity strength increases with increasing velocity ratio and decreases with increasing cross velocity except at z/D = −0.4.

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Figures

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Fig. 3

Schematic diagram of the test section: (a) schematic diagram of T-junction (not to scale), (b) vertical location of the measured plane ( x = 0), and (c) streamwise location of the measured plane (z=0)

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Fig. 2

Schematic diagram of experimental apparatus

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Fig. 1

Physical unit of ventilation facility: (a) model of ventilation system and (b) horizontal vanes

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Fig. 8

Flow patterns for the dividing T-junction with horizontal vanes: (a) Kelvin-like vortices with separation bubble (middle height channel at z direction) and (b) single vortex with separation bubble (near wall at z direction)

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Fig. 11

Average streamwise velocity profile for two velocity ratios (uc = 40 m/s): (a) R = 0.08 and (b) R = 0.18

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Fig. 9

Time-average velocity field at four heights for three velocity ratios (uc = 40 m/s): (a) z/D = 0.2, R = 0.08, (b) z/D = 0.2, R = 0.13, (c) z/D = 0.2, R = 0.18, (d) z/D = 0, R = 0.08, (e) z/D = 0, R = 0.13, (f) z/D = 0, R = 0.18, (g) z/D = −0.2, R = 0.08, (h) z/D = −0.2, R = 0.13, (i) z/D = −0.2, R = 0.18, (j) z/D = −0.4, R = 0.08, (k) z/D = −0.4, R = 0.13, and (l) z/D = −0.4, R = 0.18

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Fig. 10

Time-average velocity field at four heights for three cross velocities (R =0.13): (a) z/D = 0.2, uc = 30 m/s, (b) z/D = 0.2, uc = 40 m/s, (c) z/D = 0.2, uc = 50 m/s, (d) z/D = 0, uc = 30 m/s, (e) z/D = 0, uc = 40 m/s, (f) z/D = 0, uc = 50 m/s, (g) z/D = –0.2, uc = 30 m/s, (h) z/D = –0.2, uc = 40 m/s, (i) z/D = –0.2, uc = 50 m/s, (j) z/D = –0.4, uc = 30 m/s, (k) z/D = –0.4, uc = 40 m/s, and (l) z/D = –0.4, uc = 50 m/s

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Fig. 4

Instantaneous velocity field at four heights for three velocity ratios (uc = 40 m/s) (dotted line: shearing separation layer): (a) z/D = 0.2, R = 0.08, (b) z/D = 0.2, R = 0.13, (c) z/D = 0.2, R = 0.18, (d) z/D = 0, R = 0.08, (e) z/D = 0, R = 0.13, (f) z/D = 0, R = 0.18, (g) z/D = −0.2, R = 0.08, (h) z/D = −0.2, R = 0.13, (i) z/D = −0.2, R = 0.18, (j) z/D = −0.4, R = 0.08, (k) z/D = −0.4, R = 0.13, and (l) z/D = −0.4, R = 0.18

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Fig. 5

Instantaneous velocity field at four heights for three cross velocities (R =0.13): (a) z/D = 0.2, uc = 30m/s, (b) z/D = 0.2, uc = 40 m/s, (c) z/D = 0.2, uc = 50 m/s, (d) z/D = 0, uc = 30 m/s, (e) z/D = 0, uc = 40 m/s, (f) z/D = 0, uc = 50 m/s, (g) z/D = −0.2, uc = 30 m/s, (h) z/D = −0.2, uc = 40 m/s, (i) z/D = −0.2, uc = 50 m/s, (j)z/D = −0.4, uc = 30 m/s, (k) z/D = −0.4, uc = 40 m/s, and (l) z/D = −0.4, uc = 50 m/s

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Fig. 6

Instantaneous vorticity field at four heights for three velocity ratios (uc = 40 m/s): (a) z/D = 0.2, R = 0.08, (b) z/D = 0.2, R = 0.13, (c) z/D = 0.2, R = 0.18, (d) z/D = 0, R = 0.08, (e) z/D = 0, R = 0.13, (f) z/D = 0, R = 0.18, (g) z/D = −0.2, R = 0.08, (h) z/D = −0.2, R = 0.13, (i) z/D = −0.2, R = 0.18, (j) z/D = −0.4, R = 0.08, (k) z/D = −0.4, R = 0.13, and (l) z/D = −0.4, R = 0.18

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Fig. 7

Instantaneous vorticity field at four heights for three cross velocities (R =0.13): (a) z/D = 0.2, uc = 30 m/s, (b) z/D = 0.2, uc = 40 m/s, (c) z/D = 0.2, uc = 50 m/s, (d) z/D = 0, uc = 30 m/s, (e) z/D = 0, uc = 40 m/s, (f)z/D = 0, uc = 50 m/s, (g) z/D = −0.2, uc = 30 m/s, (h) z/D = −0.2, uc = 40 m/s, (i) z/D = −0.2, uc = 50 m/s, (j)z/D = −0.4, uc = 30 m/s, (k) z/D = −0.4, uc = 40 m/s, and (l) z/D = −0.4, uc = 50 m/s

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Fig. 12

Time-average vorticity field at four heights for three velocity ratios (uc = 40 m/s): (a) z/D = 0.2, R = 0.08, (b) z/D = 0.2, R = 0.13, (c) z/D = 0.2, R = 0.18, (d) z/D = 0, R = 0.08, (e) z/D = 0, R = 0.13, (f) z/D = 0, R = 0.18, (g) z/D = −0.2, R = 0.08, (h) z/D = −0.2, R = 0.13, (i) z/D = −0.2, R = 0.18, (j) z/D = −0.4, R = 0.08, (k) z/D = −0.4, R = 0.13, and (l) z/D = −0.4, R = 0.18

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Fig. 13

Time-average vorticity field at four heights for three cross velocities (R =0.13): (a) z/D = 0.2, uc = 30 m/s, (b) z/D = 0.2, uc = 40 m/s, (c) z/D = 0.2, uc = 50 m/s, (d) z/D = 0, uc = 30 m/s, (e) z/D = 0, uc = 40 m/s, (f)z/D = 0, uc = 50 m/s, (g) z/D = −0.2, uc = 30 m/s, (h) z/D = −0.2, uc = 40 m/s, (i) z/D = −0.2, uc = 50 m/s, (j)z/D = −0.4, uc = 30 m/s, (k) z/D = −0.4, uc = 40 m/s, and (l) z/D = −0.4, uc = 50 m/s

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