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Gas turbine technology Aluminium Titanium Steel Nickel Figure 9. Engine materials. for the atoms by developing single-crystal blades, we increase the creep strength of the material. This is a process requiring exact casting conditions and ingenious mould designs. The mould design must ensure that only a single grain, in a preferred crystallographic orientation, is allowed to grow. Overview One can see that throughout this conceptually simple machine the engine manufacturer has worked strenuously to maximize the potential of each component. The result is a machine combining a fantastic array of materials that generates the maximum performance at minimum weight with the current technology. Figure 9 is a general arrangement of a Trent engine that depicts the range of materials employed. Materials technology continues to drive further advancements in aero-engine performance. There are additional innovations that cannot be included in current designs because of the prohibitive cost, both internally and to the airlines. Major improvements will probably result from material development, towards lighter and stronger materials. Innovations such as metal matrix composites and engineering ceramics are a real source of interest and continued research and development. In addition, research into burn- resistant titanium alloys, allowing them to be used November 2003 further into the hot end of the engine, and nickel alloy compositions will further refine the engines’ performance. During your next flight it is worth spending a moment to appreciate the cutting-edge technology that is sending you skywards, and to feel safe and contented that it is a technology backed by excellent know-how and millions of miles of experience. Acknowledgments D Rugg, P Withey, C Hanley and C Woodward. Received 4 June 2003 PII: S0031-9120(03)64371-6 Reference [1] CumpstyN2003JetPropulsion(Cambridge: Cambridge University Press) Peter Spittle is a Materials Technologist at Rolls-Royce. He joined as a graduate trainee in 1999 with a degree in Materials Science and Technology from the University of Birmingham. Since completing his training period he has worked as a Materials Technologist within the aero-engine business and as a Core Metallurgist within Rolls-Royce’s naval marine business, supporting the design and manufacture of reactors for the UK’s nuclear submarine fleet. PHYSICS EDUCA TION 511PDF Image | Gas turbine technology Rolls Royce
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