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공랭식 3단 왕복동 공기압축기의 시스템 설계 및 성능시험
이안성,김영철,정영식,Lee, An-Seong,Kim, Yeong-Cheol,Jeong, Yeong-Sik 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.10
A 150 m$^{3}$/hr, 30 kg/cm$^{2}$, air-cooled 3-stage reciprocating air compressor is designed to be used in starting large diesel engines. A basic design procedure is presented to meet the targeted pressure and flow rate, and especially the volumetric efficiency. Temperature and stress analyses of the cylinder are performed using FEM modelings. The dynamics of valve system is analyzed and stress at the valve seat due to valve impact is evaluated. To reduce friction loss and wear at the compressor engine system, tribological design practices are suggested. Fin-type coolers are designed to dissipate generated compression heat at each stage. Finally, a prototype is manufactured and performance test is carried out utilizing an air tank. Performance results are compared to the design targets, other foreign specifications, and some quality standards.
내부 원형 그루브를 갖는 저속 드라이 가스 시일의 윤활 성능해석
이안성(An Sung Lee),김준호(Jun Ho Kim) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.39 No.-
In this study a general Galerkin FE lubrication analysis method was utilized to analyze the complex lubrication performance of a spiral groove seal having an additional inner circular groove, which was designed for a chemical process mixer operating at a low speed of the maximum 500 rpm. Equilibrium seal clearance analyses under varying outer pressure revealed that the seal maintains a certain levitation seal clearance under the outer pressure of more than about 1.5 bar, regardless of a rotating speed. Also, under the normal outer pressure of 11 bar, the axial stiffness of the seal was predicted to have a high value of more than 7.0e+07 N/m, regardless of a rotating speed and thereby, the seal is expected to maintain a stable thickness of lubrication film under a certain external excitation acting.
이안성(An Sung Lee),김준호(Jun Ho Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.37 No.-
In this study a general Galerkin FE formulation of the incompressible Reynolds equation is derived for lubrication analyses of noncontacting mechanical face seals. Then, the formulation is applied to analyze the flexibly mounted stator-type reactor coolant pump seals of local nuclear power plants, which have deep straight grooves or plane coning on their primary seal ring faces. Their various lubrication performances have been predicted. Results show that the analyzed deep straight groove seal should have a net coning of less than 0.6 tim to satisfy the leakage limit. And for the same amount of equilibrium opening force the plane coning seal requires to have a 3 times higher dimensionless coning than the deep straight groove seal.
이안성(An Sung Lee),양재훈(Jae-Hun Yang),최동훈(Dong-Hoon Choi) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.38 No.-
Applying a general Galerkin FE lubrication analysis method to spiral groove dry gas seals, this study analyzes in detail the effects of groove design parameters, such as a number of groove, spiral angle, groove width ratio, groove radius ratio, groove depth ratio. and groove taper ratio, on the lubrication performances of an opening force, leakage, axial stiffness and damping, and angular stiffness and damping at low and high rotating speeds: 3,600 and 15.000 rpm. Results show that, for the primary design consideration performances such as the opening force and axial and angular stiffnesses, a large number of groove, spiral angle of 25°, groove width ratio of 0.46, groove radius ratio of 1.1, groove depth ratio of 1.0, and groove taper ratio of 0.0 are preferred. Where the recommended relatively low values of groove depth and taper ratios are to keep the axial and angular dampings positive or higher than 0 particularly at the high rotating speed.
이안성(An Sung Lee),박무룡(Moo Ryong Park),김영철(Young Cheol Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
In this study is presented a general Galerkin-FE gas lubrication analysis method. Then, the method is applied to analyze spiral groove dry gas seals particularly for low-speed mixer applications, where their maximum rotating speeds are 500 rpm. Results show that a spiral groove seal with an additional inner circular groove performs slight better than its counterpart without the inner groove for opening force but only at the expense of more leakage.
이안성(An Sung Lee),이동환(Dong Whan Lee),나언주(Uhn Joo Na) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
In high-speed gas-levitation applications a high compressibility number often brings a numerical difficulty in predicting generated pressure profiles by causing erroneous sudden pressure overshootings and oscillations in the trailing-edge. To treat the problem, in this study an exact exponential high-order shape function is introduced in the FE lubrication analyses. It is, shown by various examples that the high-order shape function scheme can subdue successfully pressure overshootings and oscillations.
내부 원형 그루브를 갖는 저속 드라이 가스 시일의 윤활 성능해석 및 실험
이안성(An Sung Lee),김준호(Jun Ho Kim) 한국트라이볼로지학회 2005 한국윤활학회지(윤활학회지) Vol.21 No.2
In this study a general Galerkin FE lubrication analysis method was utilized to analyze the complex lubrication performance of a spiral groove seal having an additional inner circular groove, which was designed for a chemical process mixer operating at a low speed of the maximum 500 rpm. Equilibrium seal clearance analyses under varying outer pressure revealed that the seal maintains a certain levitation seal clearance under the outer pressure of more than about 1.5 bar, regardless of a rotating speed. Also, under the normal outer pressure of 11 bar, the axial stiffness of the seal was predicted to have a high value of more than 7.0 e + 07 N/m, regardless of a rotating speed and thereby, the seal is expected to maintain a stable thickness of lubrication film under a certain external excitation acting. A seal levitation test rig was designed and constructed. Experimental results at 500 rpm agreed well with analytical predictions and the applied lubrication analysis method was verified.