درباره ما
NASA-TN-D-7890
A brief study of the effects of turbofan-engine bypass ratio on short and long-haul cruise aircraft
Year: 1975
Abstract: A brief study of the effects of turbofan-engine bypass ratio on Breguet cruise range and take-off distance for subsonic cruise aircraft showed significant differences between short- and long-haul aircraft designs. Large thrust lapse rates at high bypass ratios caused severe reductions in cruise range for short-haul aircraft because of increases in propulsion system weight. Long-haul aircraft, with a higher fuel fraction (ratio of propulsion weight plus total fuel weight to gross take-off weight), are less sensitive to propulsion-system weight and, accordingly, were not significantly affected by bypass-ratio variations. Both types of aircraft have shorter take-off distances at higher bypass ratios because of higher take-off thrust-weight ratios.
Subject: AIRCRAFT DESIGN
Show full item record
| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T16:41:25Z | |
| date available | 2017-09-04T16:41:25Z | |
| date copyright | 01/01/1975 | |
| date issued | 1975 | |
| identifier other | VPBBFEAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/104698 | |
| description abstract | A brief study of the effects of turbofan-engine bypass ratio on Breguet cruise range and take-off distance for subsonic cruise aircraft showed significant differences between short- and long-haul aircraft designs. Large thrust lapse rates at high bypass ratios caused severe reductions in cruise range for short-haul aircraft because of increases in propulsion system weight. Long-haul aircraft, with a higher fuel fraction (ratio of propulsion weight plus total fuel weight to gross take-off weight), are less sensitive to propulsion-system weight and, accordingly, were not significantly affected by bypass-ratio variations. Both types of aircraft have shorter take-off distances at higher bypass ratios because of higher take-off thrust-weight ratios. | |
| language | English | |
| title | NASA-TN-D-7890 | num |
| title | A brief study of the effects of turbofan-engine bypass ratio on short and long-haul cruise aircraft | en |
| type | standard | |
| page | 46 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1975 | |
| contenttype | fulltext | |
| subject keywords | AIRCRAFT DESIGN | |
| subject keywords | BYPASSES | |
| subject keywords | FUEL CONSUMPTION | |
| subject keywords | MATHEMATICAL MODELS | |
| subject keywords | RATIOS | |
| subject keywords | SHORT HAUL AIRCRAFT | |
| subject keywords | TAKEOFF | |
| subject keywords | TURBOFAN ENGINES | |
| subject keywords | WEIGHT ANALYSIS |