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NACA-TR-D-949
Effect of screens in wide-angle diffusers
Year: 1949
Abstract: An experimental investigation at low airspeeds was made of the filling effect observed when a screen or similar resistance is placed across a diffuser. The filling effect is found to be real in that screens can prevent separation or restore separated flow in diffusers even of extreme divergence and to depend principally on screen location and pressure-drop coefficient of the screen. Results are given for three different diffusers of circular cross section with a variety of screen arrangements. Effects of single screens and multiple screens are shown. The mechanics of the filling effect is explained, and possible efficiencies are discussed. Results of arrangements of multiple screens in wide-angle diffusers are given to show a possible application to damping screens as used in wind tunnels to reduce turbulence. (author)
Subject: AIR FLOW
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:38:17Z | |
| date available | 2017-09-04T17:38:17Z | |
| date copyright | 01/01/1949 | |
| date issued | 1949 | |
| identifier other | DPONEEAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/161265 | |
| description abstract | An experimental investigation at low airspeeds was made of the filling effect observed when a screen or similar resistance is placed across a diffuser. The filling effect is found to be real in that screens can prevent separation or restore separated flow in diffusers even of extreme divergence and to depend principally on screen location and pressure-drop coefficient of the screen. Results are given for three different diffusers of circular cross section with a variety of screen arrangements. Effects of single screens and multiple screens are shown. The mechanics of the filling effect is explained, and possible efficiencies are discussed. Results of arrangements of multiple screens in wide-angle diffusers are given to show a possible application to damping screens as used in wind tunnels to reduce turbulence. (author) | |
| language | English | |
| title | NACA-TR-D-949 | num |
| title | Effect of screens in wide-angle diffusers | en |
| type | standard | |
| page | 46 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1949 | |
| contenttype | fulltext | |
| subject keywords | AIR FLOW | |
| subject keywords | ANGLES (GEOMETRY) | |
| subject keywords | DAMPING | |
| subject keywords | DIFFUSERS | |
| subject keywords | INLET FLOW | |
| subject keywords | RESISTANCE | |
| subject keywords | RESTORATION | |
| subject keywords | SCREENS | |
| subject keywords | SEPARATED FLOW | |
| subject keywords | SHAPES | |
| subject keywords | TURBULENCE | |
| subject keywords | TURBULENT DIFFUSION | |
| subject keywords | WIND TUNNELS |