Talk:Bristol Siddeley Orpheus

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Military history: Aviation / British / European

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What does this mean?[edit]

incorporating the turbine entry duct and its stator vanes into the flame tube outlet, each flame tube providing one seventh of the overall duct

I'm looking at the image and trying to understand what this means, but failing. Can someone expand on this section?

Maury Markowitz (talk) 02:20, 14 November 2013 (UTC)[reply]

It means that instead of having a separate turbine entry ring with the guide vanes inside, instead the turbine inlet guide vanes are incorporated into the end of the combustion chambers (flame tubes) themselves. This does away with the need for a component that is usually difficult to cast or fabricate and is sometimes prone to fatigue.

Normally the output of the combustion chambers leads in to the turbine entry ring with the entry guide vanes guiding the jet of gases into the turbine blades at the correct angle. In the Orpheus the guide vanes were incorporated into the end of each combustion chambers themselves, rather than being all incorporated within a separate component. [1] — Preceding unsigned comment added by 2.24.215.129 (talk) 16:57, 30 September 2014 (UTC)[reply]

Certainly not the first[edit]

This article makes it sound like the central spindle concept was invented for the Orpheus. It was not. The same design was used on a number of engines that pre-date the Orpheous, including the Metrovick F.2. The concept is generally only applicable to axial flow designs because of the "folding" and placement of the flame cans on a centrifugal flow design, so it appears on many designs as the UK moved to axial flow designs on-mass. Maury Markowitz (talk) 12:42, 18 November 2013 (UTC)[reply]

The difference is that the Orpheus was (AFAIK) the first engine to place the compressor and turbine between two bearings. In the F2, the compressor was indeed on a long large-diameter shaft supported by only two bearings, but the turbine was overhung, beyond the rear bearing. Amongst other issues, the F2 bearings were each quite complicated bits of kit, much more so than the Orpheus. Andy Dingley (talk) 12:20, 20 January 2014 (UTC)[reply]