COOLING OF GAS TURBINE COMPONENTS SUBJECT TO HIGH TEMPERATURES.
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The construction of high-temperature gas turbines is a practical possibility the turbines offer economy with internal cooling for rotor blades made of presently available materials. Internal cooling gives satisfactory results with both single-circuit and double-circuit cooling systems. In the single-circuit system, the heat carrier may be either air, water or saturated steam in the double-circuit system, it is a liquid metal in the primary circulation and any of the heat carriers used in the single-circuit system in the secondary circuit. Water-cooling of the blades encounters serious design difficulties. It is economical to use air if the amount of heat to be taken off is small. It is economical to use saturated steam to remove small amounts of heat, especially in case of exhaust cooling systems. The dimensions of the radiator or the size of the heat-transfer area may be reduced by the use of cooling steam in double-circuit systems. In the case of higher output, or if a considerable amount of heat is to be removed, it is feasible to supply the heated super-heated steam from the cooling system to a waste-heat condensation turbine. In compounded steamgas turbine installations, where the cooling system forms large amounts of steam, intermediate cooling-system super-heaters may also be used. Author
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