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Primary Surface Recuperator Alloy Oxidation: A Comparison of Accelerated Engine Testing to Field Operation

机译:一次表面换热器合金氧化:加速发动机测试与现场操作的比较

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摘要

The Capstone C65 Microturbine primary surface recuperator (PSR) core has been manufactured from Haynes alloy HR-120 since 2005 (Microturbine is a registered trademark of Capstone Turbine Corporation; Haynes and HR-120 are trademarks of Haynes International, Inc.). When exposed to the harsh operating environment of the microturbine PSR, HR-120 forms a protective oxide scale that is resistant to the effects of the water vapor present in the exhaust gas. Long-term accelerated microturbine testing with samples in a modified PSR with a removable aft dome is ongoing at an elevated turbine exit temperature (TET) ~100°F higher than normal operation. The elevated TET test engine is operated at steady-state conditions, and the engine is shut down at predetermined intervals for sample removal. Material characterization of the elevated TET samples has been carried out by Capstone Turbine Corporation in collaboration with Oak Ridge National Laboratory. The surface oxide scale formation and associated alloy compositional changes have been evaluated for elevated TET samples with operating lives ranging from —1800 h to —26,500 h. In addition, field-operated HR-120 recuperators have been sectioned and samples have been evaluated for operating lives ranging from —5500 h to —18,000 h. Results from the microstructural and compositional analyses of both the long-term steady-state elevated TET HR-120 samples and the field-operated HR-120 recuperator samples will be presented and compared.
机译:自2005年以来,Capstone C65微型涡轮一次表面换热器(PSR)芯就由Haynes合金HR-120制造(Microturbine是Capstone Turbine Corporation的注册商标; Haynes和HR-120是Haynes International,Inc.的商标)。 HR-120暴露在微型涡轮PSR的恶劣操作环境中时,会形成保护性氧化皮,可抵抗废气中存在的水蒸气的影响。在比正常运行温度高约100°F的涡轮出口温度(TET)的情况下,正在进行在带有可移动后圆顶的改进PSR中对样品进行的长期加速微型涡轮机测试。高架TET测试发动机在稳态条件下运行,并且发动机以预定的时间间隔关闭以取出样品。 Capstone Turbine Corporation与Oak Ridge国家实验室合作对高架TET样品进行了材料表征。对于工作寿命为-1800 h至-26,500 h的升高的TET样品,已经评估了表面氧化物垢的形成和相关的合金成分变化。此外,还对HR-120现场换热器进行了剖切,并对样品进行了-5500 h至-18,000 h的使用寿命评估。长期稳态升高的TET HR-120样品和现场操作的HR-120换热器样品的微观结构和成分分析结果将被介绍和比较。

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