Automotive gas turbine ceramic regenerator design and reliability program. Progress report, April 1, 1976--June 30, 1976

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Abstract
The primary objective of the ERDA/Ford Ceramic Regenerator Design and Reliability Program is to develop ceramic regenerator cores that can be used in passenger car gas turbine engines, Stirling engines, and industrial/truck gas turbine engines. Specific durability objectives are defined as achieving a B/sub 10/ life of 10,000 hours on a truck/industrial gas turbine engine duty cycle. Previous reports, under this contract, summarized operating experience on lithium aluminum silicate (LAS) ceramic regenerator cores obtained at Ford Motor Company. The primary cause of failure of these regenerators was determined to be chemical attack of the LAS material. Improved materials and design concepts aimed at reducing or eliminating chemical attack were placed on durability test in Ford 707 industrial gas turbine engines late in 1974. Results are described of 2700 hours of turbine engine durability testing accumulated during the second quarter of 1976. Two materials, aluminum silicate and magnesium aluminum silicate continue to show promise toward achieving the durability objectives of this program. Regenerator cores made from aluminum silicate show no evidence of chemical attack damage after 5000 hours of engine test.

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