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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DOUBLE REHEAT TURBINES Double reheat gives a further relative efficiency improvement of about 2% but it has never been widely used due to the greater complexity of the power plant. There are however some notable exceptions. For example the two 412 MW units being supplied by GEC ALSTHOM for the Skaerbaek and Nordjylland power stations in Denmark9 where the operators, ELSAM, have been determined to achieve the maximum practical Fig. 5 Skaerbaek double reheat turbine. 6 Skaebaek VHP cylinder. 7 Skaerbaek HPjIP cylinder.

3. Not suprisingly the engine had many teething problems, notably with combustion, but nevertheless just over four years later on 15th May 1941 Gerry Sayer successfully piloted the Gloster E28/39 aircraft on its first flight, powered by the WI engine and the jet engine was here to stay. Dr A. A. Griffith joined Rolls-Royce in 1939 and as a leading mathematician and scientist continued to develop the axial flow gas turbine concept he had been working on at the Royal Aircraft Establishment. Rolls-Royce supported Whittle from 1940 onwards in experimental work and the Company finally entered the jet engine business by acquiring the Barnoldswick factory from Rover in 1943.

It is less certain that high temperature castings to meet the most demanding steam and stress conditions will be achieved, in which case there may be a reversion to forging for these components. DOUBLE REHEAT TURBINES Double reheat gives a further relative efficiency improvement of about 2% but it has never been widely used due to the greater complexity of the power plant. There are however some notable exceptions. For example the two 412 MW units being supplied by GEC ALSTHOM for the Skaerbaek and Nordjylland power stations in Denmark9 where the operators, ELSAM, have been determined to achieve the maximum practical Fig.

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