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최민석(Minsuk Choi),백제현(Je Hyun Baek),오성환(Seong Hwan Oh),고한영(Han Young Ko) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
A three-dimensional computation was conducted to understand effects of the low Reynolds number on the performance in a low-speed axial compressor at the design condition. The low Reynolds number can originates from the change of the air density because it decreases along the altitude in the troposphere. The performance of the axial compressor such as the static pressure rise was diminished by the separation on the suction surface and the boundary layer on the hub, which were caused by the low Reynolds number. The total pressure loss at the low Reynolds number was found to be greater than that at the reference Reynolds number at the region from the hub to 90% span. Total pressure loss was scrutinized through three major loss categories in a subsonic axial compressor such as profile loss, tip leakage loss and endwall loss using Denton's loss model, and effects of the low Reynolds number on the performance were analyzed in detail.
초기응력을 가진 기저구조물을 이용한 곡면형 압전 유니모프 개발
강래형(Kang, Lae-Hyong),이종원(Lee, Jong-Won),한재흥(Han, Jae-Hung),정상준(Chung, Sang-Joon),고한영(Ko, Han-Young) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.1
This paper proposes a novel curved shape piezoelectric unimorph using a new fabrication method. Instead of using thermal coefficient mismatch, which has been used for conventional processes for curved shape unimorphs, we used pre-stressed substrates and the room temperature adhesion process. A difference of the mechanical strains between the substrate and the piezoelectric layer makes the final manufactured unimorph get curved. Several performance tests of the proposed unimorph actuators were accomplished and the test results showed the proposed unimorph actuator got comparable actuation capability compared with conventional curved shape actuators.
저 레이놀즈 수가 압축기 성능에 미치는 영향에 대한 수치적 연구
최민석(Minsuk Choi),백제현(Je Hyun Baek),정희택(Hee Taeg Chung),오성환(Seong Hwan Oh),고한영(Han Young Ko) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.2
A three-dimensional computation was conducted to understand effects of the low Reynolds number on the performance in a low-speed axial compressor at the design condition. The low Reynolds number can originates from the change of the air density because it decreases along the altitude in the troposphere. The performance of the axial compressor such as the static pressure rise was diminished by the separation on the suction surface with full span and the boundary layer on the hub, which were caused by the low Reynolds number. The total pressure loss at the low Reynolds number was found to be greater than that at the reference Reynolds number at the region from the hub to 85% span. Total pressure loss was scrutinized through three major loss categories in a subsonic axial compressor such as the profile loss, the tip leakage loss and the endwall loss using Denton's loss model, and the effects of the low Reynolds number on the performance were analyzed in detail.