Analysis of transitional separation bubbles on infinite swept wings

Davis, Robert L.; CARTER, J.; Reshotko, Eli

doi:10.2514/6.1985-1685

Cited by 26 publications

(28 citation statements)

References 10 publications

(3 reference statements)

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“…In order to determine the onset of separated flow transition Re st is expressed in terms of the turbulence intensity (Tu) and the momentum thickness Reynolds number at the point of separation (Reo s ) in the form [ 19] Rest = 874ReBs 1 exp[-0.4Tu] ( 10) This correlation provides a better representation of the experimental data than Davis et al [30] correlation and is used to predict onset of separated flow transition in the present computations.…”

Section: Journal Of Turbomachinerymentioning

confidence: 99%

A Computational Fluid Dynamics Study of Transitional Flows in Low-Pressure Turbines Under a Wide Range of Operating Conditions

Suzen

Huang

Ashpis

et al. 2006

Journal of Turbomachinery

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A transport equation for the intermittency factor is employed to predict the transitional flows in low-pressure turbines. The intermittent behavior of the transitional flows is taken into account and incorporated into computations by modifying the eddy viscosity, ^t, with the intermittency factor, y. Turbulent quantities are predicted by using Menter's twoequation turbulence model (SST). The intermittency factor is obtained from a transport equation model which can produce both the experimentally observed streamwise variation of intermittency and a realistic profile in the cross

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Section: Journal Of Turbomachinerymentioning

confidence: 99%

A Computational Fluid Dynamics Study of Transitional Flows in Low-Pressure Turbines Under a Wide Range of Operating Conditions

Suzen

Huang

Ashpis

et al. 2006

Journal of Turbomachinery

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“…For cases involving separation bubbles the model developed by Roberts [28], and modified by Davis et al [29], is used:…”

Section: Roberts' Modelmentioning

confidence: 99%

The effects of blade count on boundary layer development in a low-pressure turbine

Dorney

Flitan

Ashpis

et al. 2000

38th Aerospace Sciences Meeting and Exhibit

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“…In contrast to Davis et al (1987) correlation, the current formula seems to provide a better representation of the data scattering. In the present paper Equation 12 is used as a replacement of Davis et al correlation to predict the onset of separated-flow transition.…”

Section: Attached-flow M-ansitionmentioning

confidence: 99%

“…In Figure 1, Davis et al (1987) correlation is given along with the data of Roberts (1980) (the original data used to develop Davis' correlation), Simon et al (2000), Hultgren and Volino (2000) and Lake (1999). Each point (except for the data of Robert (1980)) is numbered to indicate the Reynolds numbers of the cases based on exit velocity and suction surface length.…”

Section: Attached-flow M-ansitionmentioning

confidence: 99%

“…The transition Reynolds number, Rest , which is based on the length defined between the onset location of separation and that of transition, is correlated as a function of a turbulent factor representing effects of the external turbulence level and its disturbance spectrum. The model was simplified by Davis et al (1987) to only a function of turbulence intensity, Rest = 2.5 x 10 4 log l ocoth(0.1732TV), (11) where Tu is the freestream turbulence intensity value at the onset of separation. Although this model was originally proposed for swept wing flows, it had been used widely for predicting onset of transition in a variety of separated flows.…”

Section: Attached-flow M-ansitionmentioning

confidence: 99%

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Predictions of separated and transitional boundary layers under low-pressure turbine airfoil conditions using an intermittency transport equation

Suzen

Huang

Hultgren

et al. 2001

39th Aerospace Sciences Meeting and Exhibit

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A new transport equation for the intermittency factor was proposed to predict separated and transitional boundary layers under low-pressure turbine airfoil conditions. The intermittent behavior of the transitional flows is taken into account and incorporated into computations by modifying the eddy viscosity, µt , with the intermittency factor, y. Turbulent quantities are predicted by using Menter's two-equation turbulence model (SST). The intermittency factor is obtained from a transport equation model, which not only can reproduce the experimentally observed streamwise variation of the intermittency in the transition zone, but also can provide a realistic cross-stream variation of the intermittency profile.In this paper, the intermittency model is used to predict a recent separated and transitional boundary layer experiment under low pressure turbine airfoil conditions. The experiment provides detailed measurements of velocity, turbulent kinetic energy and intermittency profiles for a number of Reynolds numbers and freestream turbulent intensity conditions and is suitable for validation purposes. Detailed comparisons of computational 'Postdoctoral Researcher, Member AIAA. t Associate Professor, Senior Member AIAA.Associate Fellow AIAA § Aerospace Engineer, Senior Member AIAA.

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Analysis of transitional separation bubbles on infinite swept wings

Cited by 26 publications

References 10 publications

A Computational Fluid Dynamics Study of Transitional Flows in Low-Pressure Turbines Under a Wide Range of Operating Conditions

A Computational Fluid Dynamics Study of Transitional Flows in Low-Pressure Turbines Under a Wide Range of Operating Conditions

The effects of blade count on boundary layer development in a low-pressure turbine

Predictions of separated and transitional boundary layers under low-pressure turbine airfoil conditions using an intermittency transport equation

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