The Effect of Pressure Gradient and Freestream Turbulence Intensity on the Length of Transitional Boundary Layers

Fraser, C. J.; Milne, John; Gardiner, ID

doi:10.1243/pime_proc_1988_202_107_02

Cited by 9 publications

(3 citation statements)

References 10 publications

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“…While the nondimensional formation rate parameter N includes the propagation parameter σ, the very strong dependence of N on pressure gradient indicates that the spot formation rate increases significantly as adverse pressure gradient strengthens. Fraser (1988) found that favorable pressure gradients continue the trend of Figure 15, with the spot formation rate decreasing as the favorable pressure gradient increases. Figure 15: Effect of non-dimensional pressure gradient parameter on spot formation parameter N. (From Gostelow, 1994) …”

Section: Pressure Gradient Effectsmentioning

confidence: 54%

Control of Aerodynamic Flows. Delivery Order 0051: Transition Prediction Method Review Summary for the Rapid Assessment Tool for Transition Prediction (RATTraP)

Davis¹,

Reed²,

Youngren³

et al. 2005

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Section: Pressure Gradient Effectsmentioning

confidence: 54%

Control of Aerodynamic Flows. Delivery Order 0051: Transition Prediction Method Review Summary for the Rapid Assessment Tool for Transition Prediction (RATTraP)

Davis¹,

Reed²,

Youngren³

et al. 2005

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“…to pressure gradient could be detected. The effects of pressure gradient and free-stream turbulence intensity on the length of transition were further studied by Fraser et al (1988). Their data showed that while the turbulence level remains constant, an increase in the adverse pressure gradient causes a decrease in the transition length Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Adverse Pressure Gradients on Momentum and Thermal Structures in Transitional Boundary Layers: Part 1 — Mean Quantities

Mislevy

Wang

1995

Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration

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“…The most consistent definition of the state of transition has proved to be the observation of turbulent intermittency. Some measurements of transition in a streamwise pressure gradient, in which observations of intermittency have been reported in addition to the other boundary layer properties, have been made by Narasimha (1957), Abu-Ghannam and Shaw (1980), Fraser, Milne and Gardiner (1988), Ashworth, LaGraff and Schultz (1989) and by Gostelow and Blunden (1988).…”

mentioning

confidence: 99%

Similarity Behavior in Transitional Boundary Layers Over a Range of Adverse Pressure Gradients and Turbulence Levels

Gostelow

Walker

1990

Volume 1: Turbomachinery

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Boundary layer transition has been investigated experimentally under low, moderate and high free-stream turbulence levels and varying adverse pressure gradients. Under high turbulence levels and adverse pressure gradients a pronounced subtransition was present. A strong degree of similarity in intermittency distributions was observed, for all conditions, when the Narasimha procedure for determination of transition inception was used. Effects of free-stream turbulence on the velocity profile are particularly strong for the laminar boundary layer upstream of the transition region. This could reflect the influence of the turbulence on the shear stress distribution throughout the layer and this matter needs further attention. The velocity profiles in wall coordinates undershoot the turbulent wall layer asymptote near the wall over most of the transition region. The rapidity with which transition occurs under adverse pressure gradients produces strong lag effects on the velocity profile; the starting turbulent boundary layer velocity profile may depart significantly from local equilibrium conditions. The practice of deriving integral properties and skin friction for transitional boundary layers by a linear combination of laminar and turbulent values for equilibrium layers is inconsistent with the observed lag effects. The velocity profile responds sufficiently slowly to the perturbation imposed by transition that much of the anticipated drop in form factor will not have occurred prior to the completion of transition. This calls into question both experimental techniques which rely on measured form factor to characterize transition and boundary layer calculations which rely on local equilibrium assumptions in the vicinity of transition.

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The Effect of Pressure Gradient and Freestream Turbulence Intensity on the Length of Transitional Boundary Layers

Cited by 9 publications

References 10 publications

Control of Aerodynamic Flows. Delivery Order 0051: Transition Prediction Method Review Summary for the Rapid Assessment Tool for Transition Prediction (RATTraP)

Control of Aerodynamic Flows. Delivery Order 0051: Transition Prediction Method Review Summary for the Rapid Assessment Tool for Transition Prediction (RATTraP)

The Effects of Adverse Pressure Gradients on Momentum and Thermal Structures in Transitional Boundary Layers: Part 1 — Mean Quantities

Similarity Behavior in Transitional Boundary Layers Over a Range of Adverse Pressure Gradients and Turbulence Levels

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