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한상조(Han Sang-Jo),박준영(Park Jun-Young),박무룡(Park Moo-Ryong),최범석(Choi Bum-Seog) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Thermal cycle analysis of ultra-micro gas turbine is conducted to check the feasibility of the ultra-micro gas turbine with 500W output. UMGT consists of radial compressor, combustor, recuperator, radial turbine, and generator. The required mass flow rate is 15g/s and efficiency is 11 % with the recuperator. The detailed design of the components will be based on these cycle simulation results.
유기 랭킨 사이클 시스템을 위한 외향 반경류 터빈 설계
우상혁(Sang-Hyuk Woo),임형수(Hyung-Soo Lim),한상조(Sang-Jo Han) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
This paper describes a design for a radial outflow turbine which is for Organic Rankine Cycle(ORC) system. The radial outflow turbine is characterized in that the working fluid moves in along the axial direction and out along the radial direction. If the flow rate of the radial outflow turbine is the same as that of the axial turbine, the volume is smaller and the power is higher than that of the axial turbine. The nozzle/rotor sizing and one dimensional design are conducted for the basic layout design. The design conditions are determined by referring to the open literature. The boundary condition are obtained from a paper of an ORC system with mega watt power using the pentane fluid. Based on the concept and conditions from the papers, a radial outflow turbine with 3㎿ power, 3000rpm rotation speed and 5 stages is designed and simulated.
Fe-Si 전기강판 폐스크랩을 이용한 연자성 분말 및 테이프 제조기술
홍원식,김상현,박지연,오철민,이우성,김승겸,한상조,심금택,김휘준,Hong, Won Sik,Kim, Sang Hyun,Park, Ji-Yeon,Oh, Chulmin,Lee, Woo Sung,Kim, Seung Gyeom,Han, Sang Jo,Shim, Geum Taek,Kim, Hwi-Jun 한국마이크로전자및패키징학회 2016 마이크로전자 및 패키징학회지 Vol.23 No.2
This study focused on examining the possibility for recycling of Fe-Si electric sheet. We manufactured Fe-6.5Si mother alloy using by Fe-Si electric sheet scrap for transformer core materials. And then, soft magnetic alloy powder which diameter and shape were $45{\sim}150{\mu}m$ and sphere type was prepared by gas atomization process. As we compared to commercial Fe-6.5Si powder, its diameter distribution and microstructure of recycled powder was a similar. To investigate the possibility of reusing the soft magnetic composite sheet for electronics, recycled powder was treated to have a high aspect ratio (AR), and we finally obtained the 65~66 AR and $2.3{\mu}m$ thickness powder. To release the residual stress of powder, heat treatment was conducted under $300{\sim}400^{\circ}C$, $N_2$ gas. And then, soft magnetic sheet was made by tape casting process using by those powders. After the density and permeability of tape was measured, and we confirmed that the recycled Fe-Si electric sheet scrap was possible to reuse the soft magnetic materials of electronics.