Technical Brief

Measurement of Transitional Surface Roughness Effects on Flat-Plate Boundary Layer Transition

[+] Author and Article Information
Heechan Jeong

Mechanical Engineering,
Seoul National University,
Gwanak-ro 1, Gwanak-gu,
Seoul 08826, South Korea
e-mail: jhc891012@snu.ac.kr

Seung Woo Lee

Mechanical Engineering,
Seoul National University,
Gwanak-ro 1, Gwanak-gu,
Seoul 08826, South Korea
e-mail: krisjohn123@snu.ac.kr

Seung Jin Song

Mechanical Engineering;Institute of Advanced Machines and Design,
Seoul National University,
Gwanak-ro 1, Gwanak-gu,
Seoul 08826, South Korea
e-mail: sjsong@snu.ac.kr

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 29, 2018; final manuscript received November 29, 2018; published online January 14, 2019. Assoc. Editor: Pierre E. Sullivan.

J. Fluids Eng 141(7), 074501 (Jan 14, 2019) (7 pages) Paper No: FE-18-1145; doi: 10.1115/1.4042258 History: Received March 29, 2018; Revised November 29, 2018

An experimental study has been conducted to investigate the effects of transitionally rough surface on the flat-plate boundary layer transition. Transitional boundary layers with three different flat plates (ks+ = 0.07 ∼ 0.19, 2.71 ∼ 7.05, and 13.65 ∼ 41.09) have been measured with a single-sensor hot-wire probe. All of the measurements have been conducted under zero pressure gradient (ZPG) at the fixed Reynolds number (ReL) and freestream turbulence intensity (Tu) of 3.05 × 106 and 0.2%. Transitionally, rough surface does not affect the sigmoidal distribution of turbulence intermittency model; but induces earlier transition onset and shortens the transition length. For all surfaces, streamwise turbulence intensity profiles with similar values of turbulence intermittency are similar for the transition length less than 60%. Therefore, mean velocity profiles with the similar values of turbulence intermittency are similar regardless of surface conditions. However, downstream of 60% of the transition length, mean velocity defect increases as the surface roughness increases. Enhanced diffusion of turbulent kinetic energy from the near wall (y/δ < 0.1) to the outer part (y/δ ≈ 0.4) of the boundary layer due to the surface roughness is responsible for the increased momentum deficit.

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Fig. 1

Schematic of the flat-plate test section

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Fig. 2

Static pressure coefficient plotted versus normalized flat-plate length

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Fig. 3

Transitional mean velocity profiles with similarity profiles for ks = 1.27 μm, ZPG case

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Fig. 4

Peak turbulence intermittency distributions for all test surfaces

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Fig. 5

Turbulent spot production rate plotted versus freestream turbulence

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Fig. 6

Peak turbulence intermittency distributions for test cases normalized by the transition length

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Fig. 7

Mean velocity profiles for γ ≈ 0.01 to γ ≈ 0.5

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Fig. 8

Mean velocity profiles for late stages of transition: (a) γ ≈ 0.72 and (b) γ ≈ 0.96

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Fig. 9

Normalized momentum thickness versus scaled transition length for all test cases

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Fig. 10

Turbulence intensity profiles for γ ≈ 0.01 to γ ≈ 0.5

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Fig. 11

Turbulence intensity profiles for late stages of transition: (a) γ ≈ 0.88 and (b) γ ≈ 0.96

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Fig. 12

Contours of PSD (u2) for late-stage transitional boundary layer: (a) ks = 1.27 μm, γ = 0.96 and (b) ks = 373.2 μm, γ = 0.96



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