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강명수(Myung-soo Kang),윤완노(Wan-no Yun),정남근(Nam-gun Jung),김준성(Jun-sung Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The vibration increased suddenly during the normal operation of the gas turbine in cogeneration plant. The subsequent disassembly showed one blade of compressor 5th stage fractured and many downstream blades were damaged. The OEM redesigned and replaced the 5th blades already, because the 5th blade failure had occurred before. Optical microscope and scanning electron microscope inspection of the blade which had the same indication by the non-destructive test showed the forging defect at the same location with the fractured blade. The forging defect might be induced by the insufficient removal of surface crack and scale or foreign object inclusion in the process of hot forging. The defect existed at the highly stressed area and the crack initiated at the point. And the crack propagated by the high cycle fatigue and fractured finally. This paper describes the root cause analysis and countermeasures for the gas turbine compressor blade damage of the cogeneration plant.
복합화력발전소 가스터빈 압축기 블레이드에 대한 손상원인 고찰
양경현(Yang, Kyeong-Hyeon),송오섭(Song, Oh-Seop),조철환(Cho, Cheul-Whan),윤완노(Yun, Wan-No),정남근(Jung, Nam-Geun) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.11
Gas turbine compressor blades used in a combined cycle power plant are possibly damaged and fractured during their operation. There are two possible causes of the failure of compressor blades; one is a defect of material quality which can be detected through some microscopic inspections for the fracture section, the other is high cycle fatigue problem caused by vibration and can be diagnosed by carrying out dynamic characteristics analysis for the blades. In this paper, in order to determine the cause of the failure of compressor blades in a combined cycle power plant, examination of the fracture section and the propagation mechanism of the crack via stress analysis are performed. Dynamic characteristics analysis via FRF estimation is also performed to identify the cause of failure.