Pub Date : 2021-09-30DOI: 10.15231/jksc.2021.26.3.001
Y. Lim, H. Suh
{"title":"Analysis of CH₂O, CH, and C₂ Species in a Single Droplet Flame and the Droplet Combustion Characteristics using a Short Wavelength Filtering","authors":"Y. Lim, H. Suh","doi":"10.15231/jksc.2021.26.3.001","DOIUrl":"https://doi.org/10.15231/jksc.2021.26.3.001","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44252680","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}
Pub Date : 2021-06-01DOI: 10.15231/jksc.2021.26.2.040
Yijie Zeng, Kyeong-Ho Kim, Viet Thieu Trinh, Dongfang Li, C. Jeon
{"title":"An Experimental Study on the Combustion Kinetics and Ash Melting Characteristics of Two Kinds of South Korean Coal Gangue using TGA and TMA","authors":"Yijie Zeng, Kyeong-Ho Kim, Viet Thieu Trinh, Dongfang Li, C. Jeon","doi":"10.15231/jksc.2021.26.2.040","DOIUrl":"https://doi.org/10.15231/jksc.2021.26.2.040","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49390059","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}
Pub Date : 2021-06-01DOI: 10.15231/jksc.2021.26.2.001
Jinwoo Park, William David Lee, Sungbum Kim, K. Huh
{"title":"Digital Twin for Prediction of the Steady State Temperature Field of a Natural Gas Boiler","authors":"Jinwoo Park, William David Lee, Sungbum Kim, K. Huh","doi":"10.15231/jksc.2021.26.2.001","DOIUrl":"https://doi.org/10.15231/jksc.2021.26.2.001","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42061342","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}
Pub Date : 2021-06-01DOI: 10.15231/jksc.2021.26.2.023
Juyoung Oh and Jai-ick Yoh
{"title":"Critical Effects of Temperature and Relative Humidity on Thermal Performance on Aging of NASA Standard Pyrotechnic Initiator ‘ZPP’","authors":"Juyoung Oh and Jai-ick Yoh","doi":"10.15231/jksc.2021.26.2.023","DOIUrl":"https://doi.org/10.15231/jksc.2021.26.2.023","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45431087","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}
Pub Date : 2021-06-01DOI: 10.15231/jksc.2021.26.2.014
Kyeong-Ho Kim, T. Jeong, Seung-Mo Kim, Hanyong Park, Nam-gu Han, C. Jeon
{"title":"An Experimental Study on the Characteristics of Bottom Ash in Biomass Boiler","authors":"Kyeong-Ho Kim, T. Jeong, Seung-Mo Kim, Hanyong Park, Nam-gu Han, C. Jeon","doi":"10.15231/jksc.2021.26.2.014","DOIUrl":"https://doi.org/10.15231/jksc.2021.26.2.014","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44996752","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}
Pub Date : 2021-03-01DOI: 10.15231/JKSC.2021.26.1.084
Hookyung Lee, Youngmin Woo, Min Jung Lee
Following the previously published Part 1, the Part 2 focuses on the basic combustion characteristics of fuel ammonia and research cases of applied combustion technology. In addition, we would like to review the items necessary for a large-scale demonstration of ammonia combustion technology. Most of the technologies for utilizing ammonia combustion are being carried out in Japan and are strongly promoted by policy. The results give a method of stabilizing flame and reducing nitrogen oxides when mixed burning of ammonia, and are applied to automobile engine, marine engine, gas turbine, coal-fired boiler, reheating furnace, and fuel cell. The co-burning rate, which is advantageous for stabilizing combustion and reducing nitrogen oxides, has been derived, and accordingly, the use of ammonia as a carbon-free fuel for the future is brightly expected.
{"title":"The Needs for R&D of Ammonia Combustion Technology for Carbon Neutrality - Part Ⅱ R&D Trends and Technical Feasibility Analysis","authors":"Hookyung Lee, Youngmin Woo, Min Jung Lee","doi":"10.15231/JKSC.2021.26.1.084","DOIUrl":"https://doi.org/10.15231/JKSC.2021.26.1.084","url":null,"abstract":"Following the previously published Part 1, the Part 2 focuses on the basic combustion characteristics of fuel ammonia and research cases of applied combustion technology. In addition, we would like to review the items necessary for a large-scale demonstration of ammonia combustion technology. Most of the technologies for utilizing ammonia combustion are being carried out in Japan and are strongly promoted by policy. The results give a method of stabilizing flame and reducing nitrogen oxides when mixed burning of ammonia, and are applied to automobile engine, marine engine, gas turbine, coal-fired boiler, reheating furnace, and fuel cell. The co-burning rate, which is advantageous for stabilizing combustion and reducing nitrogen oxides, has been derived, and accordingly, the use of ammonia as a carbon-free fuel for the future is brightly expected.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45834810","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}
Pub Date : 2020-12-31DOI: 10.15231/JKSC.2020.25.4.026
Yeseul Park, Minsung Choi, Xin Zhuo Li, Chanho Jeong, Ji Hoon Lee, G. Choi
The flame structure and combustion characteristics of co-firing coal and LPG with different sizes of biomass were investigated in a dual swirl pulverized coal burner by using a high-speed camera with bandpass filter and PIV system. Three sizes of spent mushroom compost (<45, 45~90, 90~150 μm) were cofired with pulverized coal (45~90 μm) at a blending ratio of 20%. When the biomass of the same size with coal was used, the turbulence intensity had the highest uniformity while other cases exhibited locally strong turbulent intensity. The combustion using <45 μm biomass was terminated early compared to other conditions, whereas the reaction region was the widest for 45~90 μm biomass. The flame had uniform turbulent intensity with wide and strong reaction when the biomass size was equal to that of coal. When using 45~90 μm of biomass, high velocity was maintained in the overall region and CH * radical was observed in a wide region with the highest radical intensity.
{"title":"Effects of Biomass Particle Size on Flame Structure and Combustion Characteristics using Blended Coal/Biomass Fuel in a Pulverized Coal Swirl Burner","authors":"Yeseul Park, Minsung Choi, Xin Zhuo Li, Chanho Jeong, Ji Hoon Lee, G. Choi","doi":"10.15231/JKSC.2020.25.4.026","DOIUrl":"https://doi.org/10.15231/JKSC.2020.25.4.026","url":null,"abstract":"The flame structure and combustion characteristics of co-firing coal and LPG with different sizes of biomass were investigated in a dual swirl pulverized coal burner by using a high-speed camera with bandpass filter and PIV system. Three sizes of spent mushroom compost (<45, 45~90, 90~150 μm) were cofired with pulverized coal (45~90 μm) at a blending ratio of 20%. When the biomass of the same size with coal was used, the turbulence intensity had the highest uniformity while other cases exhibited locally strong turbulent intensity. The combustion using <45 μm biomass was terminated early compared to other conditions, whereas the reaction region was the widest for 45~90 μm biomass. The flame had uniform turbulent intensity with wide and strong reaction when the biomass size was equal to that of coal. When using 45~90 μm of biomass, high velocity was maintained in the overall region and CH * radical was observed in a wide region with the highest radical intensity.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49492153","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}
Pub Date : 2020-12-31DOI: 10.15231/JKSC.2020.25.4.001
Yuan-guang Wang, Junho Park, C. Sohn
Two factors that affect NOX emission of swirl premix burner are investigated numerically in the present study. The first one is air fuel ratio which is changed from 31.7 to 38.7 by keeping the air flow rate and decreasing the fuel flow rate. As the air fuel ratio increases, the mixing is enhanced and temperature of a model combustor decreases. Then, the NOX emission decreases. The second factor is the air slit area of the burner. Air slit area is reduced by changing the width of slit with 3 methods depending on the position, i.e., width decrease in the upper-side, the lower-side, and both sides. The velocity of air inflow increases as the air slit width decreases. Then, unmixedness inside the burner will be reduced, which results in reduction of NOX emission. This strong correlation between unmixedness and NOX emission verifies that NOX reduction can be attained by mixing enhancement of fuel and air inside the burner.
{"title":"A Numerical Study on NOX Emission of Swirl Premix Burner Affected by Air Fuel Ratio and Air Slit Area in a Model Gas Turbine Combustor","authors":"Yuan-guang Wang, Junho Park, C. Sohn","doi":"10.15231/JKSC.2020.25.4.001","DOIUrl":"https://doi.org/10.15231/JKSC.2020.25.4.001","url":null,"abstract":"Two factors that affect NOX emission of swirl premix burner are investigated numerically in the present study. The first one is air fuel ratio which is changed from 31.7 to 38.7 by keeping the air flow rate and decreasing the fuel flow rate. As the air fuel ratio increases, the mixing is enhanced and temperature of a model combustor decreases. Then, the NOX emission decreases. The second factor is the air slit area of the burner. Air slit area is reduced by changing the width of slit with 3 methods depending on the position, i.e., width decrease in the upper-side, the lower-side, and both sides. The velocity of air inflow increases as the air slit width decreases. Then, unmixedness inside the burner will be reduced, which results in reduction of NOX emission. This strong correlation between unmixedness and NOX emission verifies that NOX reduction can be attained by mixing enhancement of fuel and air inside the burner.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46424417","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}
Pub Date : 2020-12-31DOI: 10.15231/JKSC.2020.25.4.019
Min-Sung Kang, C. Yoo, Jeong Park, S. Chung, O. Kwon
Effects of insulation thickness on flame spread over electrical copper wires with applied AC electric fields were experimentally investigated. The AC volrage and frequency varied in ranges of 0-5 kV and 10-1000 Hz, respectively. A one electrode configuration was used such that the electric potential was applied to one wire end and thus the infinite ambience could be a ground. The results showed that the flame shape and the tilting direction were significantly influnced by applied voltage and frequency. The flame spread rate decreased in an increase of insulation thickness as well as varied sensitively with applied votage and frequency. Additionally, the molten polyethylene (PE) experienced various dynamic behaviors such as dripping of molten PE, electrospray, di-electro-phoresis, and rotation of molten PE, essentially affecting the flame spread rate. These complicated phenomena were systematically analyzed and discussed.
{"title":"Effects of Insulation Thickness on Flame Spread over Electrical Copper Wire with Applied AC Electric Fields","authors":"Min-Sung Kang, C. Yoo, Jeong Park, S. Chung, O. Kwon","doi":"10.15231/JKSC.2020.25.4.019","DOIUrl":"https://doi.org/10.15231/JKSC.2020.25.4.019","url":null,"abstract":"Effects of insulation thickness on flame spread over electrical copper wires with applied AC electric fields were experimentally investigated. The AC volrage and frequency varied in ranges of 0-5 kV and 10-1000 Hz, respectively. A one electrode configuration was used such that the electric potential was applied to one wire end and thus the infinite ambience could be a ground. The results showed that the flame shape and the tilting direction were significantly influnced by applied voltage and frequency. The flame spread rate decreased in an increase of insulation thickness as well as varied sensitively with applied votage and frequency. Additionally, the molten polyethylene (PE) experienced various dynamic behaviors such as dripping of molten PE, electrospray, di-electro-phoresis, and rotation of molten PE, essentially affecting the flame spread rate. These complicated phenomena were systematically analyzed and discussed.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44330568","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}
Pub Date : 2020-12-31DOI: 10.15231/JKSC.2020.25.4.037
D. Shin
This paper analyzes the effect of low temporal resolution on the accuracy of determining the local flame speed for experimental measurements and simulations. Flame speed measurement of moving flames requires the evaluation of a temporal derivative of flame front motion. Measurements have limited temporal resolution, which can lead to a bias error in the calculation of flame speed. The error associated with the temporal resolution was derived in the leading order effect on sampling time. In order to demonstrate the error term, we employed numerical examples. Artificial flame solutions are generated by solving the G-equation with prescribed flow fields and fine spatial/temporal resolutions. By varying the sampling time step, we demonstrated the error can lead to negative values of the measured flame speed. Furthermore, when coarse sampling time steps are used, the calculated flame speed also exhibits a spurious curvature dependency. Lastly, the associated error can be estimated by spatial gradients of the flame front for convection dominated flows.
{"title":"Effect of Low Temporal Resolution on the Uncertainty of Resolving Flame Speed of Moving Flames","authors":"D. Shin","doi":"10.15231/JKSC.2020.25.4.037","DOIUrl":"https://doi.org/10.15231/JKSC.2020.25.4.037","url":null,"abstract":"This paper analyzes the effect of low temporal resolution on the accuracy of determining the local flame speed for experimental measurements and simulations. Flame speed measurement of moving flames requires the evaluation of a temporal derivative of flame front motion. Measurements have limited temporal resolution, which can lead to a bias error in the calculation of flame speed. The error associated with the temporal resolution was derived in the leading order effect on sampling time. In order to demonstrate the error term, we employed numerical examples. Artificial flame solutions are generated by solving the G-equation with prescribed flow fields and fine spatial/temporal resolutions. By varying the sampling time step, we demonstrated the error can lead to negative values of the measured flame speed. Furthermore, when coarse sampling time steps are used, the calculated flame speed also exhibits a spurious curvature dependency. Lastly, the associated error can be estimated by spatial gradients of the flame front for convection dominated flows.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45064654","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：