Correlation of theory to wind-tunnel data at Reynolds numbers below 500,000

摘要: This paper presents results obtained from two airfoil analysis methods compared with previously published wind tunnel test data at chord Reynolds numbers below 500,000. The are the Eppler-Somers design/analysis code and ISES, Drela-Giles code. experimental recent tests of Eppler 387 in NASA Langley Low Turbulence Pressure Tunnel. For R ≥ 200,000, lift pitching moment predictions both theories compare well experiment. Drag also agree experiment, although to different degrees. predicts pressure distributions which distributions, including those cases laminar separation bubbles. 60,000 100,000, fair agreement However, most drag accompanied bubble warnings indicate that too low. With code, there is a large discrepancy between computed bubbles, polar similar trend