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A Study on Combustion Characteristics of Gasoline and Diesel Fuels in a Compression Ignition Engine 汽油和柴油在压缩点火发动机中的燃烧特性研究
Power System Engineering Pub Date : 2017-02-28 DOI: 10.9726/KSPSE.2017.21.1.063
Kim， Ki-Hyun
{"title":"A Study on Combustion Characteristics of Gasoline and Diesel Fuels in a Compression Ignition Engine","authors":"Kim， Ki-Hyun","doi":"10.9726/KSPSE.2017.21.1.063","DOIUrl":"https://doi.org/10.9726/KSPSE.2017.21.1.063","url":null,"abstract":": The combustion characteristics of gasoline and diesel were tested in a compression ignition engine. Both fuels were used with same common rail injection system. Combustion experiment showed that low load condition of 0.45 MPa IMEP (indicated mean effective pressure) was tested in metal and optical engines. The gasoline combustion showed higher hydrocarbon and carbon monoxide emissions but lower soot emission compared with diesel combustion. NOx emissions were very high at late injection timing but significantly decreased at early injection timing due to the lean combustion resulted from vigorous mixing process. Direct combustion visualization showed that the diesel combustion was dominated by diffusion combustion exhibiting soot incandescence and the gasoline combustion was mostly consisted of premixed combustion showing blue chemiluminescence.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124732852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Heat Transfer and Sterilization Characteristics of an ERV Element Made of Hwang-to Paper 黄豆纸ERV元件的传热与灭菌特性
Power System Engineering Pub Date : 2017-02-28 DOI: 10.9726/KSPSE.2017.21.1.050
Minjae Cho, Saikee Oh, Y. Ahn
{"title":"Heat Transfer and Sterilization Characteristics of an ERV Element Made of Hwang-to Paper","authors":"Minjae Cho, Saikee Oh, Y. Ahn","doi":"10.9726/KSPSE.2017.21.1.050","DOIUrl":"https://doi.org/10.9726/KSPSE.2017.21.1.050","url":null,"abstract":": To increase the enthalpy exchange efficiency of ERV elements, the moisture exchange character must be improved. The moisture exchange efficiency depends on material characteristics. The material used for ERV is Hwang-to paper based on Han-ji which is Korean traditional paper. The paper has excellent performance in moisture exchange and heat transfer compared with polymer and other papers. To have an anti bacteria performance and to improve moisture exchange performance of Han-ji, Hwang-to is added to the Han-ji. The enthalpy exchange efficiency of the Hwang-to paper shows 5% greater than that of the conventional paper. In case of Escherichia Coli, the reduction rate of bacteria is 96.6% and in case of Pseudomonas, the reduction rate of bacteria is 97.5%. The ERV element made of Hwang-to paper has a great possibility as an ERV element.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123526017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Free Vibration Analysis of Curved Beams Regarded as Discrete System Using Finite Element-Transfer Stiffness Coefficient Method 用有限元-传递刚度系数法分析离散系统弯曲梁的自由振动
Power System Engineering Pub Date : 2017-02-28 DOI: 10.9726/KSPSE.2017.21.1.037
M. Choi, D. Yeo
{"title":"Free Vibration Analysis of Curved Beams Regarded as Discrete System Using Finite Element-Transfer Stiffness Coefficient Method","authors":"M. Choi, D. Yeo","doi":"10.9726/KSPSE.2017.21.1.037","DOIUrl":"https://doi.org/10.9726/KSPSE.2017.21.1.037","url":null,"abstract":": A curved beam is one of the basic and important structural elements in structural design. In this paper, the authors formulated the computational algorithm for analyzing the free vibration of curved beams using the finite element-transfer stiffness coefficient method. The concept of the finite element-transfer stiffness coefficient method is the combination of the modeling technique of the finite element method and the transfer technique of the transfer stiffness coefficient method. And, we confirm the effectiveness the finite element-transfer stiffness coefficient method from the free vibration analysis of two numerical models which are a semicircle beam and a quarter circle beam.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128721980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Low Cycle Fatigue Life Assessment of Alloy 617 Weldments at 900℃ by Coffin-Manson and Strain Energy Density-Based Models 基于Coffin-Manson和应变能密度模型的617合金900℃低周疲劳寿命评估
Power System Engineering Pub Date : 2017-02-28 DOI: 10.9726/KSPSE.2017.21.1.043
Tungga Dewa Rando, Seon Jin Kim
{"title":"Low Cycle Fatigue Life Assessment of Alloy 617 Weldments at 900℃ by Coffin-Manson and Strain Energy Density-Based Models","authors":"Tungga Dewa Rando, Seon Jin Kim","doi":"10.9726/KSPSE.2017.21.1.043","DOIUrl":"https://doi.org/10.9726/KSPSE.2017.21.1.043","url":null,"abstract":"This work aims to investigate on the low cycle fatigue life assessment, which is adopted on the strain-life relationship, or better known as the Coffin-Manson relationship, and also the strain energy density-based model. The low cycle fatigue test results of Alloy 617 weldments under 900oC have been statistically estimated through the Coffin-Manson relationship according to the provided strain profile. In addition, the strain energy density-based model is proposed to represent the energy dissipated per cycle as fatigue damage parameter. Based on the results, Alloy 617 weldments followed the Coffin-Manson relationship and strain energy density-based model well, and they were compatible with the experimental data. The predicted lives based on these two proposed models were examined with the experimental data to select a proper life prediction parameter.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132645519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Motion Response Analysis of a Floating Body of Barge-type in Stokes Waves 驳船型浮体在Stokes波中的运动响应分析
Power System Engineering Pub Date : 2017-02-28 DOI: 10.9726/KSPSE.2017.21.1.018
Seung-Chul Lee, J. Goo
{"title":"A Motion Response Analysis of a Floating Body of Barge-type in Stokes Waves","authors":"Seung-Chul Lee, J. Goo","doi":"10.9726/KSPSE.2017.21.1.018","DOIUrl":"https://doi.org/10.9726/KSPSE.2017.21.1.018","url":null,"abstract":": The Stokes waves representing the deep sea waves are expressed as a superposition of several linear waves. To evaluate the motions of floating bodies in the deep seas, it is necessary to evaluate the motions of the bodies in the Stokes waves. The 5th-order Stokes waves are expressed as a superposition of 5 linear waves. Therefore, the motion responses of the bodies in the Stokes waves would be expressed as a superposition of the motion responses of the bodies in the each linear waves. In this research, The experimental results were compared with the numerical results in linear waves and Stokes waves.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127657803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A Study on Mass Reduction of Planetary Gear in Pitch Drive of Medium-sized Wind Turbine 中型风力发电机螺距传动中行星齿轮减重研究
Power System Engineering Pub Date : 2017-02-28 DOI: 10.9726/KSPSE.2017.21.1.005
S. Park, Y. Shin, Dong-Myoung Kim, C. Song
{"title":"A Study on Mass Reduction of Planetary Gear in Pitch Drive of Medium-sized Wind Turbine","authors":"S. Park, Y. Shin, Dong-Myoung Kim, C. Song","doi":"10.9726/KSPSE.2017.21.1.005","DOIUrl":"https://doi.org/10.9726/KSPSE.2017.21.1.005","url":null,"abstract":": Pitch drive system in wind turbine is composed by the planetary gear system to satisfied its required performance such as long life and light weight for gear train. When the planetary gear system can reduce its volume and weight, the power consumption of the wind turbine can be reduced. In this study, the planetary gear system of the pitch drive system in medium-sized wind turbine is obtained for weight reduction by shape optimization method. And the planetary gear system is verified for their strength by the structural analysis.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134564506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Losses and Flow Structure for the Movement of Turbine Blade Row 涡轮叶片排运动的损失与流动结构
Power System Engineering Pub Date : 2017-02-28 DOI: 10.9726/KSPSE.2017.21.1.070
Soo-Yong Cho, Y. Jung
{"title":"Losses and Flow Structure for the Movement of Turbine Blade Row","authors":"Soo-Yong Cho, Y. Jung","doi":"10.9726/KSPSE.2017.21.1.070","DOIUrl":"https://doi.org/10.9726/KSPSE.2017.21.1.070","url":null,"abstract":": The output power of turbine is greatly affected by the losses generated within the passage. In order to develop a better turbine or loss models, an experimental study was conducted using a linear cascade experimental apparatus. The total pressure loss and flow structures were measured at two cross-sectional planes located downstream of blade row. Measurement was conducted in a steady state for the several different locations of the blade row along the rotational direction. The blade row moved by 20 % of the pitch, and tip clearance was varied from 2% to 8%. Axial-type blades were used and its blade chord was 200mm. A square nozzle was applied and its size was 200mm x 200mm. The experiment was conducted at a Reynolds number of 3×10 5 based on the chord. Nozzle flow angle sets to 65° based on the axial direction and the solidity of blade row was 1.38. From the experimental results, the total pressure loss was greatly varied in the receding region than in the entering region. The flow properties within the blade passage were strongly changed according to the location of blade row.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"185 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123208259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Studies on the Exhaust Gas Characteristics of the Vehicle Diesel according to the Test Mode and Ambient Temperature 基于测试模式和环境温度的车用柴油尾气特性研究
Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/kspse.2016.20.6.093
Jung-Cheon Lee, C. Jeon, Ki-ho Kim, Sang-Gi Oh, An-Young Park
{"title":"Studies on the Exhaust Gas Characteristics of the Vehicle Diesel according to the Test Mode and Ambient Temperature","authors":"Jung-Cheon Lee, C. Jeon, Ki-ho Kim, Sang-Gi Oh, An-Young Park","doi":"10.9726/kspse.2016.20.6.093","DOIUrl":"https://doi.org/10.9726/kspse.2016.20.6.093","url":null,"abstract":"","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124389878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Study on the Structural Safety Evaluation of Light Weight Damper for Offshore Rigs 海洋钻井平台轻型阻尼器结构安全性评价研究
Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/kspse.2016.20.6.080
Jiseong Jang, S. Ji, Seung-Hun Han
{"title":"A Study on the Structural Safety Evaluation of Light Weight Damper for Offshore Rigs","authors":"Jiseong Jang, S. Ji, Seung-Hun Han","doi":"10.9726/kspse.2016.20.6.080","DOIUrl":"https://doi.org/10.9726/kspse.2016.20.6.080","url":null,"abstract":": In this study, The watertight damper was designed to improve conventional DN 350A butterfly valve. The FSI(Fluid-Structure Interaction) analysis has performed to investigate the safety factor for the watertight damper. When watertight damper of disk was closed, the disk of pressure value is constant. However depending on the opening angle of disk, the flow velocity and pressure are changed. The maximum velocity was appeared at the end of disk on the small outlet area of duct. When the opening angel of disk is 90°, the maximum velocity was appeared at the center of ending disk. So we were found the opening angle of disk is bigger, the flow rate is increased and velocity is also increased from the result of FSI analysis. We can find the least deformation and stress when the opening angel of damper is 90°. When the 45° opening angle of disk, the largest deformation and stress was found and the minimum safety factor 1.3 was calculated. As a result, we found that the structure of watertight damper is safe enough irrespective of opening angel.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129867242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on Hydrogen Effect in TIG Welded Stainless Steel 不锈钢TIG焊接中氢效应的研究
Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/kspse.2016.20.6.058
Jin-Kyung Lee, Sang-Pill Lee, D. Bae, Joon-Hyun Lee
{"title":"Study on Hydrogen Effect in TIG Welded Stainless Steel","authors":"Jin-Kyung Lee, Sang-Pill Lee, D. Bae, Joon-Hyun Lee","doi":"10.9726/kspse.2016.20.6.058","DOIUrl":"https://doi.org/10.9726/kspse.2016.20.6.058","url":null,"abstract":": A stainless steel has high corrosion resistance because of nickel in material, so it is used as materials for transportation and storage of hydrogen. In this study, TIG(tungsten ingot gas) welding was carried out on the stainless steel using the storage vessel of hydrogen. The microscopic structures at each region of TIG welded material such as HAZ, weld and base metals using optical microscope were observed. And the damage behavior of stainless steel that underwent the hydrogen charging using nondestructive evaluation was also studied. Ultrasonic test, which is the most generalized nondestructive technique, was applied to evaluate the relationship between the ultrasonic wave and mechanical properties at each zone of TIG welded stainless steel. The velocity and attenuation coefficients of ultrasonic wave didn’t show a remarkable difference at each region of welded stainless steel. However, the attenuation coefficient was the highest at the weld zone when hydrogen charged stainless steel. In addition, acoustic emission test was also used to study the dynamic behavior of stainless steel experienced both hydrogen charging and weld. Lots of AE event at elastic region of stress-strain curve were occurred both the hydrogen charged specimen and the free specimen. Weld, Hydrogen Charging, Nondestructive Evaluation, Ultrasonic Test, Acoustic Emission Test, AE Event","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130525839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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