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Turbine tech

Tuesday, July 18, 2017 11:58

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The Engineer has an interesting article on the remarkable technology behind Rolls Royce turbine blades.

The components the ABCF is producing are not ones that most people ever see: they are the turbine blades that are hidden away in the hottest part of jet engines. For from the decorative brilliance of Greek bronzes, they combine a utilitarian appearance with complexity of form and function and a jewel-like internal perfection: weighing only about 300g and small enough to fit in the palm of a hand, they are in fact perfect single crystals of a metal alloy whose composition has been fine-tuned over many years to operate in the hellish conditions of the fastest-moving part of a jet engine.

During a summer job in the late sixties I worked in a Rolls Royce lab where we tested this type of blade. In those days they were simpler but not so very different in appearance. The lab I worked in was trying to coat them with tungsten using a kind of plasma spray gun. Tungsten wire was fed into the plasma and sprayed by hand onto test blades. One problem was sunburn from all the uv generated by the plasma.

Surprisingly enough it all seemed rather casual to me, with little sense of urgency. We drank tea from laboratory beakers and some people brought in foreigners, which were DIY projects smuggled in to take advantage of Rolls Royce technical and engineering facilities in various parts of the site.

One chap repaired his rusty torch this way. First he had the metal case sandblasted to remove the old paint and the rust, then he repaired rust holes with resin. Next he had the thing spray painted in a Rolls Royce painting booth and finally a metal ring which held the glass was nickel-plated in a Rolls Royce plating bath. A few years later Rolls-Royce was declared bankrupt. That torch was a symptom of malaise, even I could tell that.

Things are obviously very different now and it’s a pity that this kind of story in the Engineer rarely makes it into the mainstream media. No doubt it is basically a press release, but it is an interesting one, isn’t all that technical and deserves a wider circulation. Instead we have reams of drivel about the latest incarnation of Dr Who, a kids’ TV programme.

Source: http://akhaart.blogspot.com/2017/07/turbine-tech.html

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