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DN 250만 250℃고온 스팀환경에서 운전되는 단열 브러쉬 실 마모효과에 관한 실험적 연구
하윤석,하태웅,이용복,Ha, YunSeok,Ha, TaeWoong,Lee, YoungBok 한국트라이볼로지학회 2019 한국윤활학회지(윤활학회지) Vol.35 No.2
This study presents an experimental investigation of the wear and oxidation of the bristles of a brush seal in a super-heated steam environment. We construct a model reflecting normal force and radial interference to predict the amount of wear. To monitor the volume loss of the bristle induced by the swirl phenomenon of the rotor, we measure the clearance between the rotor and the brush seal by using a non-contact 3-D device. We calculate the area by using the area-wise measurement method. Considering the obvious brush seal wear variables, we use two disks with different roughness($Ra=0.1{\mu}m$ and $100{\mu}m$) to determine the effect of roughness on wear. Considering an actual steam turbine, we utilize a steam generator and super-heater to generate a working fluid (0.95MPa, 523.15K) that has high kinetic energy. We observe the abrasion of the bristles in the hot steam environment through a scanning electron microscope image. This study also conducted energy dispersive X-ray (EDX) analysis for a qualitative evaluation of local chemistry. The results indicate that the wear and elimination of bristles occur on the disk with high roughness, and the weight increases due to oxidation. Furthermore these results, reveal that the bristle oxidation is accelerated more under super-heated steam conditions than under conditions without steam.
무급유 포일 베어링으로 지지되는 터보 블로워의 공력 불안정성이 회전체 및 내구성에 미치는 영향
이희섭(Heesub Lee),정진택(Jintaek Chung),이용복(Youngbok Lee) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11
Fuel cell turbo-blower supported by oil-free foil bearings which remove oil-contamination by elimination of the conventional ball bearing and oil lubrication systems is presented. The mixed type turbo-blower makes one stage air compression with vaneless-diffuser at operating speed, 30,000rpm. In this study, the rotordynamic and durability effects caused by aerodynamic instability were investigated with variable mass flow rate. Correlation between frequencies of pressure fluctuation in vaneless-diffuser and those of excitation forces on rotor were clearly developed in aerodynamic unsteady region. In order to confirm the durability of oil-free foil bearing, top foil was observed using measuring apparatuses. Thus these results show that it is beneficial to design high speed rotating turbomachinery considering coupling effect between aerodynamic instability and rotordynamic force, durability.
DN 250만 250℃고온 스팀환경에서 운전되는 단열 브러쉬 실 마모효과에 관한 실험적 연구
하윤석(YunSeok Ha),하태웅(TaeWoong Ha),이용복(YoungBok Lee) 한국트라이볼로지학회 2019 한국윤활학회지(윤활학회지) Vol.35 No.2
This study presents an experimental investigation of the wear and oxidation of the bristles of a brush seal in a super-heated steam environment. We construct a model reflecting normal force and radial interference to predict the amount of wear. To monitor the volume loss of the bristle induced by the swirl phenomenon of the rotor, we measure the clearance between the rotor and the brush seal by using a non-contact 3-D device. We calculate the area by using the area-wise measurement method. Considering the obvious brush seal wear variables, we use two disks with different roughness(Ra = 0.1μm and 100μm) to determine the effect of roughness on wear. Considering an actual steam turbine, we utilize a steam generator and super-heater to generate a working fluid (0.95MPa, 523.15K) that has high kinetic energy. We observe the abrasion of the bristles in the hot steam environment through a scanning electron microscope image. This study also conducted energy dispersive X-ray (EDX) analysis for a qualitative evaluation of local chemistry. The results indicate that the wear and elimination of bristles occur on the disk with high roughness, and the weight increases due to oxidation. Furthermore these results, reveal that the bristle oxidation is accelerated more under super-heated steam conditions than under conditions without steam.