Analysis of leading-edge separation bubbles on airfoils

Crimi, Peter; Reeves, Barry L.

doi:10.2514/3.7250

Cited by 35 publications

(11 citation statements)

References 11 publications

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“…Empiricism is common to all separation bubbles analyses which utilize inviscid-viscid interaction techniques, especially in connection to transition. Often the models of transition are extensions of that used in attached boundary layer flows: analysts may use an en method to predict transition location (Gleyzes et al, 1985;van Ingen et al, 1985) or an intermittency factor to model the length of transition (Crimi and Reeves, 1976;. These models are often validated by comparing the predicted pressure distribution or momentum thickness variation in a separation bubble with that in experiments.…”

Section: Short Bubble Perturbationmentioning

confidence: 99%

Transition in a Separation Bubble

Malkiel

Mayle

1995

Volume 1: Turbomachinery

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In the interest of being able to predict separatingreattaching flows, it is necessary to have an accurate model of transition in separation bubbles. An experimental investigation of the process of turbulence development in a separation bubble shows that transition occurs within the separated shear layer. A comparison of simultaneous velocity traces from probes separated in the lateral direction suggests that Kelvin-Helmholtz waves, which originate in the laminar shear layer, do not break down to turbulence simultaneously spanwise when they proceed to agglomerate. The streamwise development of intermittency t beginning of transition T end of transition, turbulent

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Section: Short Bubble Perturbationmentioning

confidence: 99%

Transition in a Separation Bubble

Malkiel

Mayle

1995

Volume 1: Turbomachinery

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“…tion occurs where the local Reynolds number based on the momentum thickness RQ is related to length Reynolds number R x by the equation There are also several empirical formulas for predicting the onset of transition in flows involving separation bubbles such as those given by Horton 6 and Crimi and Reeves. 7 The latter assumes that transition occurs when…”

Section: Introductionmentioning

confidence: 99%

Essential ingredients of a method for low Reynolds-number airfoils

Cebeci

1989

AIAA Journal

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A calculation method for low-Reynolds-number flows is described and appraised in terms of comparisons between calculations and measurements. It comprises interaction between solutions of inviscid-and boundarylayer equations and involves the e n method to determine the location of the onset of transition with further interaction to insure that upstream effects of the turbulent-flow region are correctly represented. The importance of the length of the transition region, which usually occurs within a separation bubble, is demonstrated, and an extended version of the intermittency expression used in the Cebeci-Smith algebraic, eddy-viscosity formulation is proposed and shown to represent the separation-induced transitional flows. The comparison of calculated and measured results encompasses five airfoils, chord Reynolds numbers from 3 x 10 5 to 8 X10 6 , and angles of attack from 0-11 deg, and shows that the essential features of these flows are correctly represented.

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“…Reeves [15] also used an integral analysis in developing a prediction scheme for leading edge separation bubbles. Gerhart and Chima [16] Nreported that an attempt to apply an integral boundary layer scheme in an interaction procedure for treating subsonic turbulent separation had, to date, been unsuccessful.…”

Section: Imentioning

confidence: 99%