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- W202389053 abstract "This report describes the results of a 27-month follow-on effort directed toward developing the technology necessary to build a high-temperature, high-pressure ceramic heat exchanger for operation with a small (200-hp) closed Brayton cycle engine. The ceramic heat exchanger operates with 3000/sup 0/F combustion products on one side and heats high-pressure argon gas, which subsequently is delivered to a turbine, at 1800/sup 0/F. The design approach selected for the heat exchanger consisted of an array of siliconized silicon carbide U-tube modules employing 180 1-in.-dia tubes. A preliminary design of the heat exchanger was made that formed the basis for subsequent development effort. An extensive materials data base was obtained for Norton company's NC-430 siliconized silicon carbide during the previous program phase. This data was augmented during this program phase with over 200 additional basic materials tests. The materials test program encompassed strength tests, cyclic fatigue tests, and stress rupture tests at 2300/sup 0/F. Strength data compiled in the form of Weibull plots for application to design efforts. Slow crack growth was not observed in NC-430 at 2300/sup 0/F. Materials specimens, subscale heat exchanger components, and a subscale heat exchanger module were designed and built for the testing effort. Various tests weremore » conducted on the subscale ceramic heat exchanger components to develop a feasible full-scale, high-temperature, high-pressure sealing concept to allow modular construction of large ceramic heat exchangers. A high-pressure, high-temperature seal of glass encapsulated carbon was successfully designed and tested to 1800/sup 0/F and 150 psia. A complete heat exchanger module was produced and tested under simulated engine operating conditions up to 2300/sup 0/F tube wall temperatures. This test was designed to demonstrate the design technique and to test the reliability predictions for the various ceramic components.« less" @default.
- W202389053 created "2016-06-24" @default.
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- W202389053 date "1983-05-01" @default.
- W202389053 modified "2023-09-27" @default.
- W202389053 title "High-temperature ceramic-heat-exchanger development. Final report" @default.
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