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NASA-CR-152-241
Estimation of tunnel blockage from wall pressure signatures: A review and data correlation
Year: 1979
Abstract: A method is described for estimating low speed wind tunnel blockage, including model volume, bubble separation and viscous wake effects. A tunnel-centerline, source/sink distribution is derived from measured wall pressure signatures using fast algorithms to solve the inverse problem in three dimensions. Blockage may then be computed throughout the test volume. Correlations using scaled models or tests in two tunnels were made in all cases. In many cases model reference area exceeded 10% of the tunnel cross-sectional area. Good correlations were obtained regarding model surface pressures, lift drag and pitching moment. It is shown that blockage-induced velocity variations across the test section are relatively unimportant but axial gradients should be considered when model size is determined.
Subject: ALGORITHMS
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Statistics
NASA-CR-152-241
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:30:25Z | |
| date available | 2017-09-04T15:30:25Z | |
| date copyright | 01/01/1979 | |
| date issued | 1979 | |
| identifier other | OANKAEAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/31805 | |
| description abstract | A method is described for estimating low speed wind tunnel blockage, including model volume, bubble separation and viscous wake effects. A tunnel-centerline, source/sink distribution is derived from measured wall pressure signatures using fast algorithms to solve the inverse problem in three dimensions. Blockage may then be computed throughout the test volume. Correlations using scaled models or tests in two tunnels were made in all cases. In many cases model reference area exceeded 10% of the tunnel cross-sectional area. Good correlations were obtained regarding model surface pressures, lift drag and pitching moment. It is shown that blockage-induced velocity variations across the test section are relatively unimportant but axial gradients should be considered when model size is determined. | |
| language | English | |
| title | NASA-CR-152-241 | num |
| title | Estimation of tunnel blockage from wall pressure signatures: A review and data correlation | en |
| type | standard | |
| page | 172 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1979 | |
| contenttype | fulltext | |
| subject keywords | ALGORITHMS | |
| subject keywords | BLOCKING | |
| subject keywords | BUBBLES | |
| subject keywords | CORRELATION | |
| subject keywords | DATA | |
| subject keywords | FLOW | |
| subject keywords | LOW | |
| subject keywords | MODELS | |
| subject keywords | PRESSURE | |
| subject keywords | SCALE | |
| subject keywords | SPEED | |
| subject keywords | TUNNELS | |
| subject keywords | VISCOUS | |
| subject keywords | VOLUME | |
| subject keywords | WALL | |
| subject keywords | WAVES | |
| subject keywords | WIND |