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RISS 인기검색어
- 검색키워드
- 저자 : 방중철(J.C. Bang) (검색결과 6 건)
- 무료
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DESIGNING EXPERIENCE OF AUTOMOTIVE TURBOCHARGER IMPELLER FOR FLANK MILLING
J.C. Bang(방중철),V.A. Shuripa 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.4
The performance of small-size impellers with ruled surfaces was investigated for flank milling over a wide speed range, using computational fluid dynamics analyses and gas bench tests. An impeller with a ruled surface was designed, manufactured, and tested to evaluate the effects of blade loading, the backsweep angle, and the relative velocity distribution on the compressor performance. The simulations and tests were completed using the same compressor cover with identical inlet and outlet channels to accurately compare the performance of the abovementioned impeller with a commercial impeller containing sculptured blades. Both impellers have the same number of blades, number of splitters, and shroud meridional profiles. The backsweep angles of the blades on the ruled impeller were selected to work with the same pinched diffuser as for a sculptured impeller. The inlet-to-exit relative velocity diffusion ratio and the blade loading were provided to maximize the flow rate and to minimize the surge flow rate. The design flow rate, rpm, were selected same for both impellers. Test results showed that for the compressor stage with a ruled impeller, the efficiency was increased by 0.32% with an extended surge margin without a reduction in the pressure ratio as compared to the impeller with the sculptured design. It was concluded that an increased relative velocity diffusion coupled with a large backsweep angle was an effective way to improve the compressor stage efficiency. Additionally, an appropriate blade loading distribution was important for achieving a wide operating range and higher efficiency.
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DESIGNING EXPERIENCE OF AUTOMOTIVE TURBOCHARGER IMPELLER FOR FLANK MILLING
J.C. Bang(방중철),V.A. Shuripa 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.4
The performance of small-size impellers with ruled surfaces was investigated for flank milling over a wide speed range, using computational fluid dynamics analyses and gas bench tests. An impeller with a ruled surface was designed, manufactured, and tested to evaluate the effects of blade loading, the backsweep angle, and the relative velocity distribution on the compressor performance. The simulations and tests were completed using the same compressor cover with identical inlet and outlet channels to accurately compare the performance of the abovementioned impeller with a commercial impeller containing sculptured blades. Both impellers have the same number of blades, number of splitters, and shroud meridional profiles. The backsweep angles of the blades on the ruled impeller were selected to work with the same pinched diffuser as for a sculptured impeller. The inlet-to-exit relative velocity diffusion ratio and the blade loading were provided to maximize the flow rate and to minimize the surge flow rate. The design flow rate, rpm, were selected same for both impellers. Test results showed that for the compressor stage with a ruled impeller, the efficiency was increased by 0.32% with an extended surge margin without a reduction in the pressure ratio as compared to the impeller with the sculptured design. It was concluded that an increased relative velocity diffusion coupled with a large backsweep angle was an effective way to improve the compressor stage efficiency. Additionally, an appropriate blade loading distribution was important for achieving a wide operating range and higher efficiency.
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김성훈(S.H. Kim),김창훈(C.H. Kim),김민우(M.W. Kim),방중철(J.C. Bang) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
We remodel a diesel engine into the visible engine of the swirl chamber type, analyze photographs of combustion process with a high speed video camera. At the same time, we measure the pressure of a combustion chamber, the soot density and others in order to analyze the engine performance characteristic. We are going to test as this way.<br/> ·We analyze combustion flames which arc changed by effects of the fluid motion according to the swirl chamber shapes.<br/> ·In the combustion chamber mechanism, we analyze effects of a main chamber, a swirl chamber and a Jet Passage. And we make use of the design data of a swirl diesel engine on the basis of these results.
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김형우(H.W.Kim),이운근(U.K.Yi),이준웅(J.W.Lee),방중철(J.C.Bang) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
The development of an active safety system for a vehicle is indispensable considering the worldwide trend of developing safety system, the traffic conditions and the increasing rate of traffic accidents. This paper describes the configuration of a laser radar system, provides the several methods for measuring the distance between the leading and host vehicles and suggests a new method for measuring the distance. The method is cost-effective and increases the distance resolution. It is the primary goal to obtain more accurate distance data by improving and modifying the disadvantages occurred from the classical integration method.
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한종호,최익수,방중철 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
The process of complete combustion of diesel engine is influenced by many factors. Several parameters such as flow system, injection system, shape of combustion chamber and fuel property affect the complete combustion state of diesel engine. Especially, the fuel-air mixture of diesel engine combustion has predominant effects on engine performance and pollutant emission. For the experiment, three kinds of the combustion chamber were designed and manufactured to consider the cavity shape and the air flow. In addition we changed four-cycles diesel engine into two-cycles visualization of diesel engine. And then we analyzed the effect of shape of combustion chamber type, scavenging pressure(106.4kPa, 111.5kPa) and scavenging temperature(2p℃) on combustion flame in order to find optimal combustion chamber condition for better combustion and better performance. As a result the combustion process of the cylindrical type in the state of scavenging pressure of 111.5kPa and scavenging temperature of 20℃ showed the best effects.
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기관 회전수와 드로틀 개도량 변화에 따른 배기 다기관내의 압력 변동 분석
박경석,김세웅,김영일,심국상,방중철 金烏工科大學校 産業技術開發硏究院 1999 産業技術開發硏究 Vol.15 No.-
This paper describes characteristics of the pressure variation occurred in the exhaust manifold and the cylinder of the gasoline engine. The in-cylinder pressures have been compared steady firing and motoring engine by experimental method and also pressures of exhaust manifold have been compared by experimental method using two sensors. Experimental results showed that in-cylinder pressures of steady firing engine are increased according to the engine revolution and in-cylinder pressures of motoring engine ate increased according to the throttle open rate. And the pressures in the exhaust manifold are delayed according to the engine revolution and the throttle open rate.
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