Advances in turbine materials, design and manufacturing by A. Strang, William M. Banks, R. D. Conroy, M. J. Goulette

By A. Strang, William M. Banks, R. D. Conroy, M. J. Goulette

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The 1500 MW steam turbine, designed and manufactured by GEe ALSTHOM, is the latest of a series of steam turbines developed for the French nuclear programme and the progressively increasing power output can be seen in Fig. 8. The French policy decision to rely on nuclear power has resulted in a programme that has included 42-1000 MW units, 10-1300 MW units and culminating in 4-1500 MW units. The conventional arrangement of large nuclear turbines is that steam from the reactor passes first to a double flow HP turbine cylinder, exhausting to water separators and reheaters.

1. " Neglecting Reynolds and Mach number effects, the aerodynamic behaviour of a repeating stage is completely described by specifiying stage reaction R, stage loading coefficient 'l/J, flow coefficient 'P, and ratios of linear dimensions. Hence, rl, r/' == fn (R, 'l/J, 'P, hi I, D[ j Do, Total-to-total 'T/TT = tj I, ... ). (2) stage efficiency excluding leakage losses can be written as hoo - h02 hoo - ho2s = 1 _ (1 - 'T/')[(l - R + #4)2 + cp2] + (1 - 'T/")[(R 1jJ + #4? + cp2] (3) , and stage efficiency is obtained by subtracting leakage losses 'fJSt == 'fJTT - (~~ + ~1), (4) where c'.

The evolution of the jet engine was proceeding at such a pace there wasn't an aircraft in the world, at the time, that could utilise this power. However this was only a temporary situation, the rapid production of the Derwent and Nene engines all based on the Whittle WI engine were subsequently used to power military aircraft around the world, including licence agreements in the USA, USSR, China, France and many other countries. 2 EVOLUTION OF WHITTLE'S CONCEPT Following these early developments the next major achievement was the Dart engine of the Vickers Viscount, Fig.

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