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박상찬,류재덕,이기형,Park, Sang-Chan,Ryu, Jae-Deok,Lee, Gi-Hyeong 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.9
Recently, HSDI (High Speed Direct Injection) diesel engine has been spotlighted as a next generation engine because it has a good potential for high thermal efficiency and fuel economy. This study was carried out to investigate the in-cylinder flow characteristics generated in a 4-valve small diesel cylinder head with a tangential and helical intake port. The flow characteristics such as coefficient of flow rate(Cf), swirl ratio (Rs), and mass flow rate (ms) were measured in the steady flow test rig using the impulse swirl meter and the analysis of in-cylinder flow field was conducted by experiment using the PIV and calculation using the commercial CFD code. As the results from steady flow test indicate, the mass flow rate of the cylinder head with a short distance between the two intake ports is increased over 13% than that of the other head. However, the non-dimensional swirl ratio is decreased approximately 15%. From in-cylinder flow characteristics obtained by PIV and CFD calculation, we found that the swirl center was eccentric from the cylinder center and the velocity distribution became uniform near the TDC. In addition, the results of the calculation are good agreement with the experimental results.
입자 크기 및 분포가 유동층의 압력 요동 특성에 미치는 영향
박상찬,조병렬,홍성선 ( Sang Chan Park,Byung Real Jo,Sung Sun Hong ) 한국공업화학회 1995 공업화학 Vol.6 No.1
기체-고체 유동층에서 압력 요동의 통계적 처리방법을 이용하여 유동층 거동을 해석하였다. 측정압력 요동 통계 특성치는 평균값과 표준편차, power spectral 밀도 함수 등이다. 압력 요동의 표준편차는 최소 유동화 속도를 예측하고 유동화 현상을 설명하는데 효과적이며, 압력 요동의 표준편차와 주진동수는 고체 입자의 크기 및 분포의 영향을 받았다. 압력 요동의 표준편차는 균일계의 경우 입자크기가 증가할수록 증가하였으며, Rosin-Rammler분포와 Gaussian 분포에 대해서는 입자 분포의 표준편차가 클수록 압력 요동의 표준편차가 감소하였다. 압력 요동의 주진동수는 균일계의 경우 입자크기가 증가할수록 감소하였으며, Rosin-Rammler와 Gaussian 분포의 경우에는 분포의 편차가 클수록 증가하였다. The pressure fluctuations in a gas-solid fluidized bed has been analysed using statistical method interpreting fluidized bed behavior. The statistical properties of the pressure fluctuations calculated are the mean, the standard deviation, and the power spectral density function, etc. It has been found that the standard deviation of the pressure fluctuations can be effectively used for predicting minimum fluidizing velocity and explaining the fluidized phenomena. The standard deviation and frequency of the pressure fluctuations have been affected by the particle size and its distributions. The standard deviation of pressure fluctuations have been increased with particle size for its uniform distribution, but have been decreased with deviation of distribution for Rosin-Rammler and Gaussian distribution. The major frequency of the pressure fluctuations have been decreased with increasing particle size for uniform distribution, but have been increased with deviation of distribution for Rosin-Rammler and Gaussian distribution.
박상찬,최준락,강병욱 忠州大學校 2011 한국교통대학교 논문집 Vol.46 No.-
The cyclone/annular denuder system/filter pack sampling system(ADS) was used to collect the acidic air pollutants in Chungju city. The data set was collected on forty-one different days with 24 hour sampling period from April 16, 2010 through January 24, 2011. The chemical species measured were HNO3, HNO2, SO2 and NH3 in the gas phase. Mean concentrations for this study were: 0.6 ㎍/㎥ for HNO3, 3.0 ㎍/㎥ for HNO2, 12.9 ㎍/㎥ for SO2, 4.3 ㎍/㎥ for NH3. HNO3 and NH3 were higher during the summer. However, HNO2 and SO2 were higher during the fall and winter.
박상찬 충주대 산업과학기술연구소 1998 産業科學論文集 Vol.6 No.-
Environmental data in Chungju district in relation to air quality were studied. Informations on air quality dealing with specific pollutants, which are SOx, NOx, O3, CO, particulate and acidity of rain were reviewed and analyzed. All results were compared with environmental ambient air quality standards and especially influences by specific pollutants could be forcasted in short and long terms in this area. Also it is expected that this study will be utilized usefully in all other related fields.
박상찬,전태성 忠州大學校 2002 한국교통대학교 논문집 Vol.37 No.2
We have many foggy days around Chungju region. So we have studied effects of fog and foggy days with statistics year book. Especially we have analyzed the changes of foggy days before and after construction of Chungju dam. According to the results in 1990-2000, foggy days showed 81.3 days a year, average value of acid rain indicated pH 5.1 in Chungju on 1999, highest temperature and lowest temp. were 20.05℃ and 6.59℃, value of highest relative humidity was 76.6% in Sep., and longest frosty days were 25.0 days in Dec..