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The reverse-flow type of combustion chamber, as implemented on the third engine, was necessary to allow the continued use of the more expensive components, e.g. rotor assembly, which had been designed for the completely different straight-through combustion chamber used on the first engine.
A flashback arrestor or flash arrestor is a gas safety device most commonly used in oxy-fuel welding and cutting to stop the flame or reverse flow of gas back up into the equipment or supply line. It protects the user and equipment from damage or explosions.
The flow resistance is defined, analogously to Ohm's law for electrical resistance, [2] as the ratio of applied pressure drop and resulting flow rate: R = Δ p Q {\displaystyle R={\frac {\Delta p}{Q}}} where Δ p {\displaystyle \Delta p} is the applied pressure difference between two ends of the conduit, and Q {\displaystyle Q} the flow rate.
There, it is reversed to flow through a centrifugal compressor stage, the combustors and then the turbine stages. Beyond this, the flow is then reversed again to exit through the fan bypass duct. All engine accessories are mounted on the aft end of the engine under an engine tail-cone.
As well as detecting a blocked supply of oxygen, these must also detect a blocked exhaust or reversed flow in the exhaust flue owing to wind conditions. Two methods are used to provide these, an Oxygen Depletion System (ODS) that measures the availability of oxygen for combustion or an Atmospheric Sensing Device (ASD) measures excess heat rise ...
This means that the generally inferior flow of a reverse-flow head is less of a disadvantage. In the early days of turbo charging a reverse-flow head allowed the compressor outlet of a turbocharger to blow directly into the inlet manifold with either a blow-through or draw-through carburettor and no intercooler. This allowed the use of shorter ...
The general adoption of rotary valves in the place of poppet valves in combustion engines was prevented by the issue of sealing. Poppet valves have a seal around the tapered flange of the opening, and this seal improves with increased working pressure in the combustion chamber because the pressure forces the valve shut.
A crossflow head gives better performance than a Reverse-flow cylinder head (though not as good as a uniflow), but the popular explanation put forward for this — that the gases do not have to change direction and hence are moved into and out of the cylinder more efficiently — is a simplification since there is no continuous flow because of valve opening and closing.
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