THE INFLUENCE OF FREE AND DISTURBED LAMINAR-TURBULENT TRANSITION FOR THE WORTMANN FX 66-S-196 V1 AND EPPLER E 385 AIRFOILS AT LOW REYNOLDS NUMBERS

Laurynas Naujokaitis ,Eduardas Lasauskas

doi:10.5755/j01.mech.19.2.4158

Laurynas Naujokaitis , Eduardas Lasauskas

Open Access

https://doi.org/10.5755/j01.mech.19.2.4158

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Journal: Mechanics	Publication Date: Apr 26, 2013
Citations: 2	License type: cc-by

Affiliation: Vilnius Gediminas Technical University

Abstract

This work was carried out to compare theoretically calculated airfoil characteristics with the published measurements data. Furthermore, in this work the influence of free and disturbed laminar-turbulent transitions was analysed. The calculation of the Wortmann FX 66‑S‑ 196 V1 and Eppler E 385 airfoils was made using three codes: Eppler program system PROFIL, XFOIL and RFOIL. The influence of boundary layer disturbed transition on airfoil was analyzed at low Reynolds numbers. The calculated data were compared with published measurement data. The measurement data were obtained in low-speed, low turbulence wind tunnels of the Department of Aerospace Engineering at the Delft University of Technology and Institute of Aerodynamics and Gasdynamics at Stuttgart University.DOI: http://dx.doi.org/10.5755/j01.mech.19.2.4158

Highlights

The flow of the airfoil at low Reynolds numbers is usually better when the laminar boundary layer is constrainedly transformed to turbulent
The analysis of the free and disturbed laminarturbulent transition was performed with two airfoils and at low Reynolds numbers
PROFIL is used in a noninteracted inviscid plus boundary layer method [1] and XFOIL and RFOIL codes are used in an interacted zonal viscous/inviscid method [9]

Summary

Introduction

The flow of the airfoil at low Reynolds numbers is usually better when the laminar boundary layer is constrainedly transformed to turbulent. It is very important to investigate this disturbed turbulent stream. Nowadays such investigations can be made by using calculated codes or computations of modelling. The analysis of the free and disturbed laminarturbulent transition was performed with two airfoils and at low Reynolds numbers. The theoretical calculations were obtained using three codes – Eppler program systems PROFIL [1], XFOIL [2] and RFOIL [3]. There are a few studies done about the impact of the free and disturbed laminar-turbulent transition. They did not analyze the FX 66-S-196 V1 and E 385 airfoils at low Reynolds numbers

The airfoils

The methods of calculations

The measured data

The wind tunnels

Results and discussion

Conclusions

Summary