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The Power Jets W.2 was a British turbojet engine designed by Frank Whittle and Power Jets (Research and Development) Ltd.Like the earlier Power Jets W.1, the reverse-flow combustion configuration included a double-sided centrifugal compressor, 10 combustion chambers and an axial-flow turbine with air-cooled disc.
The reverse flow design is generally considered [according to whom?] to be inferior to a crossflow design in terms of ultimate engineering potential for two reasons. Firstly, there is limited space when inlet and exhaust ports are arranged in a line on one side of the head meaning a reduction in port area compared to a crossflow head.
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.
The two spool turbofan has a single front fan powered by a single stage turbine, a compressor with a mixed flow first stage (a diagonal compressor) and a centrifugal second stage powered by a single stage HP turbine and a reverse flow combustor. [6] [7] [8] This configuration was described in a PW&C patent filed on 6 October 2000. [9]
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Schnuerle scavenging (sometimes called "loop scavenging" or "reverse scavenging") is a design used by most modern valveless two-stroke engines. The key difference compared to crossflow scavenging is that the transfer ports are located either side of the exhaust port and aimed at the opposite cylinder wall. [ 3 ]