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최원(W. Choi),최재승(J.S Choi),정인면(I.M Jung),김지홍(J.H Kim),이일우(I.W Lee),한성훈(S.H Han),원영수(Y.S. Won) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
Propeller shall have high efficiency and improved aerodynamic characteristics to get the thrust to fly at high speed for the Regional turboprop aircraft. That is way Clark-Y airfoil which is used to conventional turboprop aircraft propeller is selected as a blade airfoil. Adkins method is used for aerodynamic design and performance analysis with respect to the propeller design point. Adkins method is based on the vortex-blade element theory which design the propeller to satisfy the condition for minimum energy loss. propeller geometry is generated by varying chord length and pitch angle at design point of Regional turboprop aircraft. The propeller design results indicate that is evaluated to be properly constructed, through analysis of propeller aerodynamic characteristics using the Meshless method and MRF, SM method.
벤취규모 1단식 전기집진기 내에서 수트 입자의 고효율 집진 실험
김용진(Y.J. Kim),홍원석(W.S. Hong),정상현(S.H. Jeong),박청연(C.Y. Park),김종호(J.H. Kim),문상철(S.C. Moon),최재승(J.S. Choi),조창호(C.H. Cho) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Bench scale study is carried out for oil soot and coal fly ash collection in electrostatic precipitator(ESP). Oil soot particle is very important air pollutant from oil or gas-fired combustion boiler. One of the important points of oil soot particle in an ESP is the submicron and/or very low resistivity dust problem such as corona quenching and re-entrainment, which decrease collection efficiency severely. In order to increase the collection efficiency of oil soot particle, we modified the discharge electrode array. Suitable choice of discharge electrode array generated high corona current density and high electric field intensity thus increased collection efficiency without increasing power consumption for oil soot particle.
소형항공기 캐빈 도어 구조 변형에 의한 공력하중 변화 해석
이철(C. Lee),최재승(J.S. Choi),정재홍(J.H. Jung),정훈화(H.H. Jeong),김지홍(J.H. Kim) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
Structural deformations due to flight load acting on the aircraft cabin door cause the deformation of surface profile and gap & mismatch between door and fuselage. In order to assess if the cabin door is opened in the deformed gap & mismatch conditions, CFD on the external flow of whole aircraft, small scale flow in gap & mismatch region and internal flow of inner cabin has been performed simultaneously. 2-D parametric studies are conducted in parallel for sensitivity analysis of design parameters. The safety of cabin door was confirmed by the analysis and was verified by flight test.
Al, Ag 박막에서 Electromigration과 Adhesion에 관한 연구
김대일(D.I. Kim),전진호(J.H. Jeon),박영래(Y.R. Park),최재승(J.S. Choi),김진영(J.Y. Kim) 한국진공학회(ASCT) 1992 Applied Science and Convergence Technology Vol.1 No.2
본 논문은 Al, Ag박막에서 엘렉트로마이그레이션 현상에 의한 힐록, 기공형성과 접착력에 대하여 연구하였다. Mo보트를 이용하여 1×10^(-7)Torr의 진공도에서 전자-빔 증착기로 현미경용 유리기판에 약 1000Å의 두께로 Al, Ag박막을 각각 증착하였다. Al, Ag박막에서 엘렉트로마이그레이션에 의한 결함을 연구하기 위하여 1×10^5(A/㎠) 의 d.c. 전류를 인가하였고 Scratch Method와 Tape Method로 Al과 Ag박막의 접착력을 측정하였다. 기공과 힐록, 그리고 스크레치 채널은 SEM과 광학현미경 사진을 이용하여 분석하였다. Al박막에서는 엘렉트로마이그레이션으로 힐록과 기공이 양극부분과 음극부분에서 각각 관찰되었다. 반면에 Ag박막에서는 Coulombic force에 의해 기공과 힐록이 양극부분과 음극부분에서 각각 형성되어 역엘렉트로마이그레이션 현상을 보였다. 접착력은 산소 친화력이 강한 Al박막에서 Ag박막 보다 크게 나타났다. The formation of hillocks and voids due to the electromigration and the adhesion force of Al and Ag thin films have been investigated. Thin films of 1000Å thickness were deposited onto slideglass substrates by electron-beam deposition system from Mo boats in a high vacuum in the range of 10^(-7)Torr. A constant d.c. current of 1×10^5(A/㎠) stressing has been stressed on Al and Ag thin films in order to observe the failures due to the electromigration. And the adhesion forces of Al and Ag thin films were measured by using scratch method and tape method. Hillocks and scratch channel were also characterized by utilizing scanning electron microscopy and optical microscope. In Al thin films, void formed near the negative region and hillocks formed near the positive region, which is mainly caused by the electron wind force. In contrast, Ag thin films resulted in the formation of voids near the positive region and hillocks near the negative region caused by Coulombic force. Al/glass showed stronger adhesion force than Ag/glass. This is believed to be due to the higher oxygen affinity of Al than that of Ag.