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The development of cambered airfoil sections having favorable lift characteristics at supercritical mach numbers (Document No: 19930082444)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1948 |
| Description | Several groups of new airfoil sections, designated as the NACA 8-series, are derived analytically to have lift characteristics at supercritical Mach numbers which are favorable in the sense that the abrupt loss of lift, characteristic of the usual airfoil section at Mach numbers above the critical, is avoided. Aerodynamic characteristics determined, from two-dimensional windtunnel tests at Mach numbers up to approximately 0.9 are presented for each of the derived airfoils. Comparisons are made between the characteristics of these airfoils and the corresponding characteristics of representative NPiCA 6-series airfoils. The experimental results confirm the design expectations in demonstrating for the NACA S-series airfoils either no variation, or an Increase from the low-speed design value, In the lift coefficient at a constant angle of attack with increasing Mach number above the critical. It was not found possible to improve the variation with Mach number of the slope of the lift curve for these airfoils above that for the NACA 6-series airfoils. The drag characteristics of the new airfoils are somewhat inferior to those of the NACA 6- series with respect to divergence with Mach number, but the pitching-moment characteristics are more favorable for the thinner new sections In demonstrating somewhat smaller variations of moment coefficient with both angle of attack and Mach number. The effect on the aero&ynamic characteristics at high Mach numbers of removing the cusp from the trailing-edge regions of two 10-percent-chord-thick NACA 6-series airfoils is determined to be negligible. |
| File Size | 3687619 |
| Page Count | 82 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930082444 |
| Archival Resource Key | ark:/13960/t6158xf8c |
| Language | English |
| Publisher Date | 1948-12-01 |
| Access Restriction | Open |
| Subject Keyword | Airfoils - Naca 836b110 - Char , Moments & Ordinates Low-drag Airfoils, Cambered Airfoils - Naca 835a216 - Char , Moments & Ordinates Low-drag Wind Tunnel Tests - Aal - High-speed ( 3 1/2'x 1') Airfoils - Naca 836d110 - Char , Moments & Ordinates Low-drag Airfoils - Naca 836a110 - Char , Moments & Ordinates Low-drag Airfoils - Naca 847a1 Airfoils - Naca 836a216 - Char , Moments & Ordinates Low-drag Airfoils - Naca 836c110 - Char , Moments & Ordinates Low-drag Airfoils - Naca 847a216 - Char , Moments & Ordinates Low-drag Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
