http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이충훈(C.H.Lee),최규훈(K.H.Choi),노석홍(S.H.Noh),정석호(S.H.Chung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
A constant volume chamber which cotains water was rotated in order to simulate solid body rotating swirl in direct injection diesel engines. The swirl number of the chamber linearly depends on the rotating speed of the chamber. Emulsified fuel was injected into water. which simulate high fuel injection into a high pressure gaseous contant volume chamber. Visualization of the fuel spray developing process in D.I. diesel engine was investigated by this liquid injection technique. The effect swirl number on the spray tip penetration and break-up lenth was investigated by experiment and modelling. Dispersion characteristics of fuel spray was also investigated according to the swirl number.<br/> <br/>
이충훈 ( C. H. Lee ),원종천 ( J. C. Won ) 한국분무공학회 2002 한국액체미립화학회지 Vol.7 No.4
N/A Convolution Fourier transformation tomographically reconstructs the spatially resolved spray injection rate from direct measuring cells. Asymmetric sprays generated from a twin-hole air shroud injector are tested with 12 equiangular projections of measurements. For each projection angle, line of sight integrated injection rate was measured at 35 positions with equal spacing measuring cells of 3 mm in width, 100 mm in length, 5 mm in depth and 0.5 mm thickness of separating wall. Interpolated data between the projection angles effectively increase the number of projections, which significantly enhances the signal-to-noise level in the reconstructed data. This modified convolution Fourier transformation scheme predicts well the structure of asymmetric sprays. Comparative study has been made between sprays with and without air shrouding. Tomograhpic reconstruction of injection rate from direct measuring cells obtained can be used to estimate the accuracy of volume fraction of spray from the LDPA tomographic reconstruction.
정상,과도 분사 조건에서의 에어슈라우드 인젝터 분무의 입경,분사량 분포에 관한 연구
이충훈 ( C. H. Lee ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.4
N/A Spray characteristics of a twin-hole air shrouded nozzle designed for gasoline injectors was investigated by using laser diffraction particle analyzer (LDPA) and tomography reconstruction. A confined spray chamber which is optically accessible through a pair of glass windows was made to simulate the fuel injection condition in intake manifold of gasoline engine. The measurement was applied to the twin hole injector with and without an air shroud. It demonstrates that for the case with an air shroud, fine atomization is achieved and there exists a large number of fine droplets between the region of the main spray streams, which conforms with the spray visualization. The drop size distribution was investigated as a function of elapse time after fuel injection. The distribution was greatly affected by the measurement position from the injector exit. Also, the spatially resolved spray volume fraction and Sauter Mean Diameter (SMD) from line-of-sight data of the LDPA are tomographically reconstructed by Convolution Fourier transformation under the steady injection condition.
H.J. Lee,S.U. Kim,S.J. So,Y.D. Cho,Y.J. Kim,S.C. Ahn,이충훈 한국물리학회 2013 Current Applied Physics Vol.13 No.6
We have investigated the characteristics of the surface of the GaP window layer of 630 nm AlGaInP LED,which was improved by post-Zn diffusion process. The measured resistance and the amount of hole concentration of the post-Zn-diffused GaP window layer have remarkably decreased and increased,respectively. Moreover, the ECV system showed that the amount of doping concentrations on the surface of the GaP window layer was significantly increased because of the diffusion of Zn atoms. The amount of surface defects observed on the post-Zn-diffused GaP window layer was also reduced. Furthermore, it was found out that the efficiency of 630 nm AlGaInP LED chip was increased due to the surface improvement of the GaP window layer. At an injection current of 40 mA, the LED chip with a Zn diffusion layer obtained a higher output power of 11 mW compared to the 7.5 mWoutput of the conventional LED chip.
[가솔린엔진] 레이저 회절법을 이용한 축대칭 분무 구조의 공간 분포 변환에 관한 실험적 연구
양승연(S.Y. Yang),이충훈(C.H. Lee),구자예(J.Y. Koo),정석호(S.H. Chung) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Abel transformation Fourier transformation and onion peeling method tomographically reconstructed spatially resolved liquid volume fractions from a set of line-of-sight laser diffraction measurements for axisymmetric sprays generated from a pintle-type gasoline injector. Spatially resolved liquid volume fractions classified into 32 size groups were translated into number density distributions and equivalent diameters which showed well evaporating characteristics of Sl engine fuel sprays. These data were also obtained from the phase Doppler measurements for the same sprays. The comparison between laseㄱ diffraction measurements and phase Doppler measurements at some spatial measurement points shows that Fourier transformation reconstructs more reasonable spatially resolved characteristics for axisymmetric sprays as well as for asymmetric sprays