科技报告详细信息
Reducing Aviation Fuel Costs with Non-Destructive Testing
Schemmel, Peter J
关键词: AIRCRAFT FUELS;    CHEMICAL REACTIONS;    COST REDUCTION;    NONDESTRUCTIVE TESTS;    THERMAL CONTROL COATINGS;    MANUFACTURING;    GAS TURBINE ENGINES;    FUEL FLOW;    ESTIMATING;    FAILURE;   
RP-ID  :  NASA/TM-2019-220165,GRC-E-DAA-TN66898
学科分类:航空航天科学
美国|英语
来源: NASA Technical Reports Server
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【 摘 要 】

Thermal barrier coatings (TBCs) are absolutely critical to the efficient and safe operation of gas turbine engines (GTEs). Manufacturing TBCs is a complex chemical, thermal and mechanical process that requires precise control. And yet, the variation in life of a TBC operated within a GTE is large. This variation ultimately reduces operational performance via a designed reduction to the turbine entry temperature, T4.This paper makes the case for developing advanced THz and sub-millimeter based nondestructive testing (NDT) techniques, capable of estimating when TBC components will fail. Such a technique could identify TBCs with low expected remaining useful lifetimes, directly after production. These TBCs could be re-manufactured, thereby not only improving their own expected useful life, but also the mean lifetime of the entire manufacturing population. A series of calculations demonstrates that TBCs with enhanced life characteristics can withstand higher T4 temperatures. Assuming that a GTE is to operate at a constant thrust, this increased temperature can be traded for a reduction in fuel flow. An analysis comparing fuel savings to manufacturing costs shows that substantial savings are achievable.

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