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정상현(S. H. Jeong),김용진(Y. J. Kim),이성범(S. B. Lee),김택중(T. J. Kim),전재모(J. M. Jun),이상기(S. K. Lee),정해동(H. D. Jeong),홍영기(Y. K. Hong),송인희(I. H. Song),류정인(J. I. Ryu) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
The main feature of electret is their ability to remove particulate matter from polluted air by strong electrostatic forces generated by the electret fibers from which they are made. High voltage corona discharge methode were used to made electret filter, and the performance characteristics of electret filter were measured by Filter Tester(TSI, Model 8130). Tests against various conditions shown that electret filters capture fine dust particles very effectively, while offering minimum of flow resistance.
최항석(H.S. Choi),김관태(K.T. Kim),김석준(S.J. Kim),정상현(S.H. Jeong),송영훈(Y.H. Song),홍성호(S.H. Hong),이준엽(J.Y. Lee) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
In this study, to increase the mixing between flue gas and reducing agent, new shapes of NH₃ ejection nozzles are designed and experimentally and numerically tested. The nozzles have six holes perpendicular to the ambient flue gas flow and the tilting angle between direction of ambient flow and the hole axis is varied. To evaluate the mixing efficiency of the proposed nozzles, numerical and experimental tests are applied to several flow conditions comparing with single hole nozzle, which is commonly used in conventional SCR process. From the results the nozzle with tilted multi-holes has the large region of high turbulent intensity compared with conventional single hole nozzle. This is originated from the high vorticity near the upstream of the jet flow issuing from the hole. The high turbulent intensity and vorticity magnitude lead to enhanced mixing between flue gas and reducing agent. Hence, the most suitable moral ratio between NOx and reducing agent for the catalytic reaction can be obtained on behalf of the intensified scalar mixing within shorter physical mixing length.
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.
지하공간의 공기 질 개선을 위한 지하철 터널 내 열차풍의 수치 해석적 연구
이준호(J.H Lee),쥬레바 막슈다(M. Juraeva),정상현(S.H. Jeong),송동주(D.J. Song) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
Subway becomes more and more main transportation in major cities. Air pollution in the subway platforms is decreased; however, dust flow inside subway tunnel and train is increased by installing Platform Screen Door. Airflow inside subway tunnel is observed using computational method in this study. The airflow characteristics around ventilation shafts and inside the tunnel is studied following the train movement, while the train moves from existing Miasamgeori station to Gireum station. ANSYS CFX V12.0.1 and ICFM CFD V12.0.1 are used to compute the airflow inside the subway tunnel.
가이드 베인이 설치된 지하철 터널 내부 공기 유동의 수치해석 연구
이동욱(D.U. Lee),류경진(K.J. Ryu),막슈다쥬레바(M. Juraeva),정상현(S.H. Jeong),송동주(D.J. Song) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
A computational model of mechanical shaft of existing Seoul subway tunnel was analyzed in this research. The airflow in the sharft and the tunnel was investigated to find installing location of a guide vane. The numerical analysis characterized the aerodynamic behavior and performance of the airflow by solving three-dimensional turbulent Reynolds-averaged Navier-Stokes equations. ANSYS CFX software was used for the computations. The airflow in the ventilation shaft of the tunnel was investigated by analyzing the mass flow rate. The computational results showed the number and proper installing location of the guide vanes in the mechanical shaft to install the guide vane.