- 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.
Aviation dictionary. 2014.
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Bypass ratio — The term bypass ratio (BPR) relates to the design of turbofan engines, commonly used in aviation. It is defined as the ratio between the mass flow rate of air drawn in by the fan but bypassing the engine core to the mass flow rate passing through … Wikipedia
Bypass duct — A bypass duct is an annular passage that allows some of a turbofan s airflow to bypass the engine core, or gas generator. If the turbofan is unmixed, the bypass duct will terminate at the bypass nozzle. In mixed turbofans, the bypass duct leads… … Wikipedia
Bypass-Verhältnis — Das Nebenstromverhältnis (engl. bypass ratio, BPR) ist ein Ausdruck der Luftfahrttechnik. Er beschreibt bei einem Zweistrom Strahltriebwerk das Verhältnis zwischen dem Luftmassenstrom, der nach der ersten Verdichterstufe der Gasturbine außen an… … Deutsch Wikipedia
medium-bypass engine — A turbofan engine with a bypass ratio between 2:1 and 4:1. A bypass ratio is the ratio of air handled by the fan to the air handled by the core engine. Also called a moderatic bypass … Aviation dictionary
low-bypass turbofan — A turbofan having a bypass ratio of less than 2:1. The usual bypass ratio of a low bypass turbofan is 1:1 … Aviation dictionary
ultrahigh bypass — A bypass engine with a very high bypass ratio. Such engines are expected to have very low noise emission levels … Aviation dictionary
high-bypass turbofan — A turbofan engine with a bypass ratio of 4:1 or higher (i.e., four or more times as much air flows across the fan as across the core engine) … Aviation dictionary
high-bypass — An engine with a bypass ratio in the region of 15:1. These engines may be used for reverse thrust. This type of configuration is known as a cold reverse thrust as opposed to a hot reverse thrust, which is provided by hot exhaust gases … Aviation dictionary
very high bypass — An engine with a bypass ratio in the region of 15:1. These engines may be used for reverse thrust. This type of configuration is known as cold reverse thrust, as opposed to hot reverse thrust, which is provided by hot exhaust gases … Aviation dictionary
Oxidizable carbon ratio dating — is a method of dating in archaeology and earth science that can be used to derive or estimate the age of soil and sediment samples up to 35,000 years old. The method is considered by some to be experimental, and it is not as widely used in… … Wikipedia