bypass ratio


Also found in: Dictionary, Acronyms, Wikipedia.

bypass ratio

bypass ratio
The numerical ratio of mass airflow in the bypass duct (of a turbojet or a turbofan) to that of mass flow through the engine core. It is cold jet divided by hot jet.
References in periodicals archive ?
Finally, it was also noticed that the bypass ratio R had no influence on the results.
The total specific actual work [7] of turbine has the same configuration with a small modification of fan actual work coefficient because of the bypass ratio is different defined.
Consequently, noise reduction strategies are aimed at increasing bypass ratio to lower nozzle exit velocities and designing bypass and core flows to improve mixing with each other and the atmosphere.
Higher pressure and bypass ratios help to achieve lower fuel consumption and quieter operation.
Except for conventional constraints considered in landing gears design, two additional constraints are highlighted here to take into account the influence by high bypass ratio engine.
They were not there to think, they were not allowed to investigate high bypass ratio engines (or they would be dismissed), and any figures that they found that did not show 0.6 as the best ratio were to go straight into the bin.
Currently, P&W's first generation geared turbofan engines use a gear reduction of 3:1, with a resulting bypass ratio of 12:1.
So Wilde invented the wide-chord blade--for which he held the patent--and effectively the three-shaft, high bypass ratio engine.
As I detailed in these pages in May 2008, the PWIOOOG has a hub-mounted planetary gearing system that drives the fan at lower speeds, permitting up to 16 percent fuel savings, higher bypass ratios, and much lower fan noise.
LEAP-X has a bypass ratio of 12:1, compared to 5:1 for current engines.
Annual Convention in Milwaukee, Bombardier VP-Marketing-Commercial Aircraft Phillippe Poutissou said the CSeries' promised "15% cash operating advantage" over today's narrowbodies is based on aircraft design as a whole, "not a simple engine plug-and-play." He added, "The only way to achieve a step-change in economics is to look at the entire package and the engine is only 50% of the package." He explained that airframe and wing "size dimension" was designed on the CSeries to optimize fully the PW1000G's 12:1 bypass ratio. "In order to take full advantage of that, you need to give yourself a clean sheet," he said.