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NACA-TN-3663
Discharge coefficients for combustor-liner air-entry holes
Year: 1956
Abstract: An experimental investigation was conducted t o determine the effects of various geometric and flow factors on the discharge coefficients for circular holes having flow parallel to the plane of the hole. The geometric and flow factors considered were hole diameter, wall thickness at the at the hole, parallel-flow duct height, boundary-layer thickness, parallel-flow velocity, static-pressure level, and pressure ratio across the test hole.
Discharge coefficients, corrected for pressure-ratio effects, were correlated with a flow parameter incorporating the total and static pressures of the discharge jet and of the parallel-flow stream. Within the range investigated, the effects of hole diameter and wall thickness at the hole on discharge coefficients were small compared with the effects of parallel-flow velocity and static-pressure ratio across the hole. The effects of duct height, boundary-layer thickness, and static-pressure level were negligible.
Discharge coefficients, corrected for pressure-ratio effects, were correlated with a flow parameter incorporating the total and static pressures of the discharge jet and of the parallel-flow stream. Within the range investigated, the effects of hole diameter and wall thickness at the hole on discharge coefficients were small compared with the effects of parallel-flow velocity and static-pressure ratio across the hole. The effects of duct height, boundary-layer thickness, and static-pressure level were negligible.
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T18:00:50Z | |
| date available | 2017-09-04T18:00:50Z | |
| date copyright | 01/01/1956 | |
| date issued | 1956 | |
| identifier other | FXONEEAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std;jsery=autho162s7D8308/handle/yse/183810 | |
| description abstract | An experimental investigation was conducted t o determine the effects of various geometric and flow factors on the discharge coefficients for circular holes having flow parallel to the plane of the hole. The geometric and flow factors considered were hole diameter, wall thickness at the at the hole, parallel-flow duct height, boundary-layer thickness, parallel-flow velocity, static-pressure level, and pressure ratio across the test hole. Discharge coefficients, corrected for pressure-ratio effects, were correlated with a flow parameter incorporating the total and static pressures of the discharge jet and of the parallel-flow stream. Within the range investigated, the effects of hole diameter and wall thickness at the hole on discharge coefficients were small compared with the effects of parallel-flow velocity and static-pressure ratio across the hole. The effects of duct height, boundary-layer thickness, and static-pressure level were negligible. | |
| language | English | |
| title | NACA-TN-3663 | num |
| title | Discharge coefficients for combustor-liner air-entry holes | en |
| type | standard | |
| page | 40 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1956 | |
| contenttype | fulltext |