Effects of leading-edge radius and maximum thickness-chord ratio on the variation with Mach number of the aerodynamic characteristics of several thin NACA airfoil sections / Robert E. Berggren and Donald J. Graham.
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| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
National Advisory Committee for Aeronautics,
1954.
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| Series: | Technical note (United States. National Advisory Committee for Aeronautics) ;
3172. |
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| Abstract: | A wind-tunnel investigation has been made to determine the effects of leading-edge radius and maximum thickness-chord ratio on the variation with Mach number of the aerodynamic characteristics of several thin symmetrical NACA 4-digit-series airfoil sections. The Mach number range of the investigation was from 0.3 to approximately 0.9 and the corresponding Reynolds number range from approximately 1,000,000 to 2,000,000. The variations with Mach number of this lift, drag, and pitching moment for a 4-percent-chord-thick airfoil section are not significantly affected by a change of leading-edge radius from 0.18 to 0.53 percent of the chord. A similar conclusion can be drawn for a leading-edge-radius various from 0.10- to 0.40-percent chord on a 6-percent-chord-thick section. Progressive improvement of the variation of lift-curve slope with Mach number, the lift and drag-divergence characteristics, and the maximum section lift characteristics at Mach numbers above 0.6 results from reduction of the maximum thickness-chord ratio from 10 to 4 percent. Section pitching-momnet characteristics are not greatly affected by variation of the maximum thickness-chord ratio. |
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| Item Description: | "April 14, 1954." NACA TN Number 3172. This supersedes NACA RM AD50D04, "Effects of leading-edge radius and maximum thickness-chord ratio on the variation with Mach number of the aerodynamic characteristics of several thin NACA airfoil sections" by Robert E. Berggren and Donald J. Graham, 1950. |
| Physical Description: | 65 pages : illustrations ; 27 cm. |
| Bibliography: | Includes bibliographical references. |
| Action Note: | committed to retain 20230101 20480101 Alliance Shared Trust https://www.coalliance.org/shared-print-archiving-policies. |