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

Abstract

This work was carried out to compare theoretical-ly calculated airfoil characteristics with the published measurements data. Furthermore, in this work the influ-ence 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 transi-tion on airfoil was analyzed at low Reynolds numbers. The calculated data were compared with pub-lished measurement data. The measurement data were ob-tained in low-speed, low turbulence wind tunnels of the Department of Aerospace Engineering at the Delft Univer-sity of Technology and Institute of Aerodynamics and Gasdynamics at Stuttgart University.

Šiuo darbu norėta palyginti teoriškai apskaičiuotas profilio charakteristikas su publikuotais eksperimentiniais duomenimis. Išnagrinėta laisvo ir sutrikdyto laminarinio turbulentinio srauto įtaka. Trimis skaitinio modeliavimo programomis – Epplerio programine sistema PROFIL, XFOIL ir RFOIL – išanalizuota pasienio sluoksnio priverstinio virsmo įtaka Wortmanno FX 66-S-196 V1 ir Eplerio E 385 sparno pro-filių aerodinaminėms charakteristikoms esant mažiems Reinoldso skaičiams. Gauti teoriniai rezultatai išanalizuoti ir palyginti su publikuotais eksperimentiniais duomenimis, gautais Delfto technologijos universiteto ir Štutgarto universiteto mažo greičio ir mažos turbulencijos aerodinaminiuose vamzdžiuose.