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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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Combination clipper
RE-HEAT (AFTER BURNING) Re-heat is a system fitted to a gas turbine engine as a means of increasing the total thrust. As much as twice the thrust can be obtained using reheat.
sources of engine noise To understand the problem of engine noise suppression, it is necessary to have a working knowledge of the noise sources and their relative importance.
what types of fringes will be formed if white light is used in a Michelson''s interferometer
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“A swap bank has to entail certain risks which are inherent to the swap business and are interrelated” Explain the risks involves in swap business.
Design a combinational logic circuit that will generate the square off all the combinations of three bit binary number represented by A,B,C
Q. What is crystal imperfection? Briefly discuss all types of point defects in crystals. Ans. The various type of crystal imperfection are as follows: (1) Point de
Exhaust duct arrangement in Aircraft: Exhaust ducts are invariably positioned to ensure that on the ground as the hot gases are directed away from the maintenance crews and air
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