Compact Metallic and Ceramic Recuperators for Gas Turbines

摘要: A compact plate-type recuperative heat exchanger feasible in metal or ceramic materials and suitable for stationary and vehicular gas turbines is described. The flow schemes and fabrication techniques of the heat exchanging matrices are illustrated. Metallic and ceramic prototype matrices are shown which have been fabricated successfully. On the bases of experimental heat transmission and friction data for the metallic matrices, typical design solutions are shown for complete recuperators. Design examples for metallic recuperators are given for large nuclear closed-cycle helium turbine power plants and for stationary and vehicular open-cycle gas turbines. For vehicular application, sizes for turbines of several hundred kilowatts are discussed. Two design examples are given of ceramic recuperators for a 70-kw vehicular gas turbine having small overall dimensions when compared to a piston engine. Some cost aspects of the compact recuperators are discussed. Compact metallic recuperators, such as described in the paper, may replace advantageously the tube type or other plate type recuperators for large stationary and vehicular gas turbine cycle applications. Furthermore, the ceramic compact recuperator also described in the paper may be a satisfying practical solution for small vehicular gas turbines, especially for the so-called “ceramic” gas turbines with gas temperatures at the turbine inlet of about 1300 C.