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Abradable Linings:
Abradable Linings are usually made of a composite material which will be abraded away should the tip of a rotating blade touch the material. In flight the casings of an engine are subject to large changes in ambient temperature, so they will expand or contract. As we know the air temperature at 30,000ft is close to -50°C this would cause the casings to contract onto the rotor and the blades will then rub. To overcome this problem abrasive materials where used on early engines to wear down the tip of the blades, but this may cause balance problems. So most engines now use abradable linings that maintain minimum tip clearance but do not affect balance. They are usually found on the fan as this is the cold area of the rotating assemblies.
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Combustion chamber injection system: Injecting a water or water/methanol mixture into the combustion chambers increases the mass flow through the turbine and the high volumetri
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Blanking involves cutting of the sheet metal along a closed outline in a single step to separate the piece from the surrounding stock. As shown in figure, the path that is cut out
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Notation for Body Axes The standard notation for the body axis sytem for aircraft dynamics. This sectionexplains the signi?cance of the term body axis and develops the non-line
Evolutionary Growth Approach Mimic how bones / plant roots add material to regions under high stress and reduce material where there is small stress • Apply load to structure
Notation for Body Axes The standard notation for the body axis sytem for aircraft dynamics. This sectionexplains the significance of the term body axis and develops the non-lin
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