درباره ما
NASA-CR-121024
An improved design method and experimental performance of two dimensional curved wall diffusers
Year: 1972
Abstract: A computer design program was developed to incorporate the suction slots in solving the potential flow equations with prescribed boundary conditions. Using the contour generated from this program two Griffith diffusers were tested having area ratios AR = 3 and 4. The inlet Reynolds number ranged from 600,000 to 7 million. It was found that the slot suction required for metastable operation depends on the sidewall suction applied. Values of slot suction of 8% of the inlet flow rate was required for AR = 4 with metastable condition, provided that enough sidewall suction was applied. For AR = 3, the values of slot suction was about 25% lower than those required for AR = 4. For nearly all unseparated test runs, the effectiveness was 100% and the exit flow was uniform. In addition to the Griffith diffusers, dump and cusp diffusers of comparable area ratios were built and tested. The results obtained from these diffusers were compared with those of the Griffith diffusers. Flow separation occurred in all test runs with the dump and cusp diffusers.
Subject: BOUNDARY CONDITIONS
Show full item record
| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:50:13Z | |
| date available | 2017-09-04T15:50:13Z | |
| date copyright | 01/01/1972 | |
| date issued | 1972 | |
| identifier other | QGLNGEAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/53313 | |
| description abstract | A computer design program was developed to incorporate the suction slots in solving the potential flow equations with prescribed boundary conditions. Using the contour generated from this program two Griffith diffusers were tested having area ratios AR = 3 and 4. The inlet Reynolds number ranged from 600,000 to 7 million. It was found that the slot suction required for metastable operation depends on the sidewall suction applied. Values of slot suction of 8% of the inlet flow rate was required for AR = 4 with metastable condition, provided that enough sidewall suction was applied. For AR = 3, the values of slot suction was about 25% lower than those required for AR = 4. For nearly all unseparated test runs, the effectiveness was 100% and the exit flow was uniform. In addition to the Griffith diffusers, dump and cusp diffusers of comparable area ratios were built and tested. The results obtained from these diffusers were compared with those of the Griffith diffusers. Flow separation occurred in all test runs with the dump and cusp diffusers. | |
| language | English | |
| title | NASA-CR-121024 | num |
| title | An improved design method and experimental performance of two dimensional curved wall diffusers | en |
| type | standard | |
| page | 77 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1972 | |
| contenttype | fulltext | |
| subject keywords | BOUNDARY CONDITIONS | |
| subject keywords | BOUNDARY LAYER CONTROL | |
| subject keywords | COMPUTER AIDED DESIGN | |
| subject keywords | DIFFUSERS | |
| subject keywords | FLOW VELOCITY | |
| subject keywords | SUCTION | |
| subject keywords | WALLS |