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NACA-RM-A50L12
Preliminary investigation of the delay of turbulent flow separation by means of wedge-shaped bodies
Year: 1951
Abstract: An experimental investigation of pyramidal, wedge-like bodies devices for delaying separation of a turbulent boundary layer was undertaken. Tests of individual wedges on a large flat plate showed that, within certain limits, effective boundary-layer control could be obtained with wedges of different geometry, but that the drag of the wedges was high, making it desirable to keep the size of the wedges to a minimum.
Tests of multiple small wedges attached to a two-dimensional NACA 633-018 airfoil model showed that greater maximum lift was attained by placing the wedges well forward along the chord, and by allowing open spaces between adjacent wedges. The best arrangement found increased the maximum lift of the airfoil about 45 percent at the expense of doubling the zero-lift drag. Similar gains were achieved by the use of small, vane-type vortex generators at about half the cost in drag.
Tests of multiple small wedges attached to a two-dimensional NACA 633-018 airfoil model showed that greater maximum lift was attained by placing the wedges well forward along the chord, and by allowing open spaces between adjacent wedges. The best arrangement found increased the maximum lift of the airfoil about 45 percent at the expense of doubling the zero-lift drag. Similar gains were achieved by the use of small, vane-type vortex generators at about half the cost in drag.
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:58:28Z | |
| date available | 2017-09-04T17:58:28Z | |
| date copyright | 01/01/1951 | |
| date issued | 1951 | |
| identifier other | FRONEEAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std;jsery=autho162s7D8308/handle/yse/181554 | |
| description abstract | An experimental investigation of pyramidal, wedge-like bodies devices for delaying separation of a turbulent boundary layer was undertaken. Tests of individual wedges on a large flat plate showed that, within certain limits, effective boundary-layer control could be obtained with wedges of different geometry, but that the drag of the wedges was high, making it desirable to keep the size of the wedges to a minimum. Tests of multiple small wedges attached to a two-dimensional NACA 633-018 airfoil model showed that greater maximum lift was attained by placing the wedges well forward along the chord, and by allowing open spaces between adjacent wedges. The best arrangement found increased the maximum lift of the airfoil about 45 percent at the expense of doubling the zero-lift drag. Similar gains were achieved by the use of small, vane-type vortex generators at about half the cost in drag. | |
| language | English | |
| title | NACA-RM-A50L12 | num |
| title | Preliminary investigation of the delay of turbulent flow separation by means of wedge-shaped bodies | en |
| type | standard | |
| page | 31 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1951 | |
| contenttype | fulltext |