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NACA-TN-2323
Theoretical investigation of submerged inlets at low speeds
Year: 1951
Abstract: The general characteristics of the flow field in a submerged air inlet are investigated by theoretical, wind-tunnel, and visual-flow studies.
Equations are developed for calculating the laminar and turbulent boundary-layer growth along the ramp floor for parallel, divergent, and convergent ramp walls, and a general equation is derived relating the boundary-layer pressure losses to the boundary-layer thickness. It is demonstrated that the growth of the boundary layer on the floor of the divergent-ramp inlet is retarded and that a vortex pair is generated in such an inlet. Functional relationships are established between the pressure losses in the vortices and the geometry of the inlet.
Equations are developed for calculating the laminar and turbulent boundary-layer growth along the ramp floor for parallel, divergent, and convergent ramp walls, and a general equation is derived relating the boundary-layer pressure losses to the boundary-layer thickness. It is demonstrated that the growth of the boundary layer on the floor of the divergent-ramp inlet is retarded and that a vortex pair is generated in such an inlet. Functional relationships are established between the pressure losses in the vortices and the geometry of the inlet.
Subject: AERODYNAMIC
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T18:43:35Z | |
| date available | 2017-09-04T18:43:35Z | |
| date copyright | 01/01/1951 | |
| date issued | 1951 | |
| identifier other | KCHUYDAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std;jsessionid=3826AF679D40527318548F1EFDEC014A/handle/yse/224957 | |
| description abstract | The general characteristics of the flow field in a submerged air inlet are investigated by theoretical, wind-tunnel, and visual-flow studies. Equations are developed for calculating the laminar and turbulent boundary-layer growth along the ramp floor for parallel, divergent, and convergent ramp walls, and a general equation is derived relating the boundary-layer pressure losses to the boundary-layer thickness. It is demonstrated that the growth of the boundary layer on the floor of the divergent-ramp inlet is retarded and that a vortex pair is generated in such an inlet. Functional relationships are established between the pressure losses in the vortices and the geometry of the inlet. | |
| language | English | |
| title | NACA-TN-2323 | num |
| title | Theoretical investigation of submerged inlets at low speeds | en |
| type | standard | |
| page | 49 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1951 | |
| contenttype | fulltext | |
| subject keywords | AERODYNAMIC | |
| subject keywords | AIR | |
| subject keywords | BODIES | |
| subject keywords | BOUNDARY | |
| subject keywords | COMPRESSIBILITY | |
| subject keywords | DISTRIBUTION | |
| subject keywords | DRAG | |
| subject keywords | FLOW | |
| subject keywords | INTAKE | |
| subject keywords | LAMINAR | |
| subject keywords | LAYER | |
| subject keywords | LOW | |
| subject keywords | MASS | |
| subject keywords | SPEED | |
| subject keywords | SUBMERGED | |
| subject keywords | SYSTEMS | |
| subject keywords | TESTS | |
| subject keywords | TUNNEL | |
| subject keywords | TURBULENT | |
| subject keywords | VISUALIZATION | |
| subject keywords | VORTICES | |
| subject keywords | WIND |