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Research Papers: Fundamental Issues and Canonical Flows

Experimental Investigation of Boundary Layer Relaminarization in Accelerated Flow

[+] Author and Article Information
Pascal Bader, Manuel Pschernig

Institute for Thermal Turbomachinery and
Machine Dynamics,
Graz University of Technology,
Graz 8010, Austria

Wolfgang Sanz

Professor
Institute for Thermal Turbomachinery and
Machine Dynamics,
Graz University of Technology,
Graz 8010, Austria
e-mail: wolfgang.sanz@tugraz.at

Jakob Woisetschläger, Franz Heitmeir

Professor
Institute for Thermal Turbomachinery and
Machine Dynamics,
Graz University of Technology,
Graz 8010, Austria

Walter Meile

Professor
Institute of Fluid Mechanics and Heat Transfer,
Graz University of Technology,
Graz 8010, Austria
e-mail: walter.meile@tugraz.at

Günter Brenn

Professor
Institute of Fluid Mechanics and Heat Transfer,
Graz University of Technology,
Graz 8010, Austria
e-mail: guenter.brenn@tugraz.at

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received June 27, 2017; final manuscript received December 11, 2017; published online March 29, 2018. Assoc. Editor: Daniel Maynes.

J. Fluids Eng 140(8), 081201 (Mar 29, 2018) (15 pages) Paper No: FE-17-1386; doi: 10.1115/1.4039257 History: Received June 27, 2017; Revised December 11, 2017

Flow in turbomachines is generally highly turbulent. Nonetheless, boundary layers may exhibit laminar-to-turbulent transition, and relaminarization of the turbulent flow may also occur. The state of flow of the boundary layer is important since it influences transport phenomena like skin friction and heat transfer. In this paper, relaminarization in accelerated flat-plate boundary-layer flows is experimentally investigated, measuring flow velocities with laser Doppler anemometry (LDA). Besides the mean values, statistical properties of the velocity fluctuations are discussed in order to understand the processes in relaminarization. It is shown that strong acceleration leads to a suppression of turbulence production. The velocity fluctuations in the accelerated boundary layer flow “freeze,” while the mean velocity increases, thus reducing the turbulence intensity. This leads to a laminar-like velocity profile close to the wall, resulting in a decrease of the local skin friction coefficient. Downstream from the section with enforced relaminarization, a rapid retransition to turbulent flow is observed. The findings of this work also describe the mechanism of retransition.

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References

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Figures

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Fig. 1

Test setup: (a) sketch of the wind tunnel and (b) detailed view of the test section with FP, AP, PP, AF, SP, and TW

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Fig. 3

(a) Development of the freestream turbulence intensity measured along the plate and (b) boundary layer thickness along the plate for the three flow cases

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Fig. 2

Computed velocity fields in the wind tunnel midplane at (top) 5 m/s, TW, γ = 10 deg; (mid) 5 m/s, TW, γ = 20 deg; (bottom) 9 m/s, γ = 20 deg

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Fig. 4

Nondimensional velocity profiles u*(y*) at different streamwise positions, measured with LDA

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Fig. 5

Nondimensional velocity profiles u+(y+) in wall coordinates at different streamwise positions, measured with LDA

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Fig. 6

Streamwise distribution of (a) velocity at the BLE u(δ(x)), (b) acceleration parameter K, (c) local skin friction coefficient c′f, and (d) shape factor H, as recorded by one-component LDA. The lines parallel to the ordinate axis mark the locations of the edges of the AP at the two different inclinations.

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Fig. 8

Normalized streamwise distributions at y/δ(x) = 0.25, 0.5 and 0.75 of (a) ratio of turbulent kinetic energy versus kinetic energy R/R495, (b) x-velocity fluctuation urms/urms,495, (c) y-velocity fluctuation vrms/vrms,495, (d) turbulence intensity Tux/Tux,495, and (e) turbulent Reynolds shear stress RS/RS495, as obtained by two-component LDA measurements

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Fig. 9

Normalized streamwise distributions at y/δ(x) = 0.25, 0.5 and 0.75 of (a) skewness Su of u and (b) skewness Sv of v, (c) flatness (kurtosis) Fu of u and (d) flatness Fv of v, as obtained by two-component LDA measurements

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Fig. 7

Nondimensional velocity profiles v*(x) in the boundary layer at different distances from the wall

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Fig. 11

Boundary layer thickness profile δ(x), and velocity fluctuations u′ and v′ at different streamwise positions and wall distances for the 5 m/s, 20 deg case

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Fig. 10

Boundary layer thickness profile δ(x), and velocity fluctuations u′ and v′ at different streamwise positions and wall distances for the 5 m/s, 10 deg case

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