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NACA-TR-1077
Two-and three-dimensional unsteady lift problems in high-speed flight
Year: 1952
Abstract: The problem of transient lift on two- and three-dimensional wings flying at high speeds is discussed as a boundary-value problem for the classical wave equation. Kirchhoff's formula is applied so that the analysis is reduced, just as in the steady state, to an investigation of sources and doublets. The applications include the evaluation of indicial lift and pitching-moment curves for two-dimensional sinking and pitching wings flying at Mach numbers equal to 0, 0.8, 1.0, 1.2 and 2.0. Results for the sinking case are also given for a Mach number of 0.5. In addition, the indicial functions for supersonic-edged triangular wings in both forward and reverse flow are presented and compared with the two-dimensional values.
Subject: AIRCRAFT
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T18:42:21Z | |
| date available | 2017-09-04T18:42:21Z | |
| date copyright | 01/01/1952 | |
| date issued | 1952 | |
| identifier other | JZDZYDAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std;query=autho162sAF679D40AC429654DD6EFDEC9FCD/handle/yse/223774 | |
| description abstract | The problem of transient lift on two- and three-dimensional wings flying at high speeds is discussed as a boundary-value problem for the classical wave equation. Kirchhoff's formula is applied so that the analysis is reduced, just as in the steady state, to an investigation of sources and doublets. The applications include the evaluation of indicial lift and pitching-moment curves for two-dimensional sinking and pitching wings flying at Mach numbers equal to 0, 0.8, 1.0, 1.2 and 2.0. Results for the sinking case are also given for a Mach number of 0.5. In addition, the indicial functions for supersonic-edged triangular wings in both forward and reverse flow are presented and compared with the two-dimensional values. | |
| language | English | |
| title | NACA-TR-1077 | num |
| title | Two-and three-dimensional unsteady lift problems in high-speed flight | en |
| type | standard | |
| page | 55 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1952 | |
| contenttype | fulltext | |
| subject keywords | AIRCRAFT | |
| subject keywords | BOUNDARY | |
| subject keywords | COMPUTATIONAL | |
| subject keywords | DELTA | |
| subject keywords | DISTRIBUTION | |
| subject keywords | DYNAMICS | |
| subject keywords | FLIGHT | |
| subject keywords | FLUID | |
| subject keywords | FORCES | |
| subject keywords | HIGH | |
| subject keywords | LIFT | |
| subject keywords | LOAD | |
| subject keywords | MOMENTS | |
| subject keywords | PARTS | |
| subject keywords | PITCHING | |
| subject keywords | PROBLEMS | |
| subject keywords | RECTANGULAR | |
| subject keywords | SINKING | |
| subject keywords | SLENDER | |
| subject keywords | SPEED | |
| subject keywords | VALUE | |
| subject keywords | WINGS |