Pub Date : 2019-03-31DOI: 10.15231/JKSC.2019.24.1.015
H. Seo, Nam-Kyun Kim, Sang Kyu Lee, Y. Moon
The occurrence of a cable fire in a nuclear power plant can cause significant damage to the internal equipment and the defense system, and even reactor melt down in the worst case. In addition, toxic gases, released by burning cable jacket and insulation materials, can hinder human evacuation and fire fighting activities. Thus, this experimental study was conducted to investigate the toxicity of two non-class 1E cables which are applied to the nuclear power plants in Korea. Experiments were conducted for two kinds of cables according to the standard code of ISO 19702, and time series heat release rate, total heat release, and the concentration of toxic gases including CO, CO2, HCl, HCN, HBr, HF, NOx and SO2 were measured From the test results, the similar characteristics between heat release rate and CO2 emission and production of a small amount of halogenated compounds in emission gas caused by addition of fireproof components have been found. These results can be used as baseline data when assessing combustion characteristics and human toxicity of electric cables.
{"title":"An Experimental Study on the Combustion Characteristics of Non Class 1E Cables","authors":"H. Seo, Nam-Kyun Kim, Sang Kyu Lee, Y. Moon","doi":"10.15231/JKSC.2019.24.1.015","DOIUrl":"https://doi.org/10.15231/JKSC.2019.24.1.015","url":null,"abstract":"The occurrence of a cable fire in a nuclear power plant can cause significant damage to the internal equipment and the defense system, and even reactor melt down in the worst case. In addition, toxic gases, released by burning cable jacket and insulation materials, can hinder human evacuation and fire fighting activities. Thus, this experimental study was conducted to investigate the toxicity of two non-class 1E cables which are applied to the nuclear power plants in Korea. Experiments were conducted for two kinds of cables according to the standard code of ISO 19702, and time series heat release rate, total heat release, and the concentration of toxic gases including CO, CO2, HCl, HCN, HBr, HF, NOx and SO2 were measured From the test results, the similar characteristics between heat release rate and CO2 emission and production of a small amount of halogenated compounds in emission gas caused by addition of fireproof components have been found. These results can be used as baseline data when assessing combustion characteristics and human toxicity of electric cables.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43208002","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 : 2019-03-31DOI: 10.15231/JKSC.2019.24.1.051
왕위엔강, J. Son, C. Sohn, Yoon Jisu, 배진현, Y. Yoon
Dynamic mode decomposition (DMD) technique is applied to analyze combustion instabilities in a model gas turbine combustor. The flame transfer function (FTF) obtained by the DMD method agrees with the experimental results qualitatively. However, FTF results show that the perturbation frequency with the largest gain is 100Hz, which contradicts the 1000Hz with the largest amplitude in the fast Fourier transform (FFT) results. In order to figure out this, gains and damping coefficients of all resonance frequencies are calculated by DMD technique. Results show the possibility that the model combustor has high-frequency instabilities as a results of coupling between flame and chamber responses. Another finding is that to obtain a pure FTF, the combustor must be removed to exclude coupling of chamber response with flame response.
{"title":"Combustion Instability Analysis of a Model Gas Turbine by Application of Dynamic Mode Decomposition","authors":"왕위엔강, J. Son, C. Sohn, Yoon Jisu, 배진현, Y. Yoon","doi":"10.15231/JKSC.2019.24.1.051","DOIUrl":"https://doi.org/10.15231/JKSC.2019.24.1.051","url":null,"abstract":"Dynamic mode decomposition (DMD) technique is applied to analyze combustion instabilities in a model gas turbine combustor. The flame transfer function (FTF) obtained by the DMD method agrees with the experimental results qualitatively. However, FTF results show that the perturbation frequency with the largest gain is 100Hz, which contradicts the 1000Hz with the largest amplitude in the fast Fourier transform (FFT) results. In order to figure out this, gains and damping coefficients of all resonance frequencies are calculated by DMD technique. Results show the possibility that the model combustor has high-frequency instabilities as a results of coupling between flame and chamber responses. Another finding is that to obtain a pure FTF, the combustor must be removed to exclude coupling of chamber response with flame response.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48793202","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 : 2019-03-31DOI: 10.15231/JKSC.2019.24.1.039
Yu Seongha, Jo, Seonghwi, Kim, Hong-jip, 김성룡
A numerical study has been performed to investigate 1-D steady/unsteady start-up characteristics for liquid rocket engines using SINDA/FLUINT. First, in order to verify the analysis of cryogenic fluid, RL-10 engine having expander cycle is selected as a target of present study. Pressure drop in cooling channels was simulated through orifice devices. Satisfactory agreement has been obtained through the comparison of the numerical analysis and the experimental results. Based on these results, a start-up analysis of RD-8 having staged combustion cycle has been performed. As comparison of the numerical analysis and the experimental results, tendency of start-up characteristics had good agreements. This methodology of present study will be able to be used for the analysis of liquid rocket engines as a future work.
{"title":"A 1-D Start-up Analysis for Liquid Rocket Engine Powerpacks","authors":"Yu Seongha, Jo, Seonghwi, Kim, Hong-jip, 김성룡","doi":"10.15231/JKSC.2019.24.1.039","DOIUrl":"https://doi.org/10.15231/JKSC.2019.24.1.039","url":null,"abstract":"A numerical study has been performed to investigate 1-D steady/unsteady start-up characteristics for liquid rocket engines using SINDA/FLUINT. First, in order to verify the analysis of cryogenic fluid, RL-10 engine having expander cycle is selected as a target of present study. Pressure drop in cooling channels was simulated through orifice devices. Satisfactory agreement has been obtained through the comparison of the numerical analysis and the experimental results. Based on these results, a start-up analysis of RD-8 having staged combustion cycle has been performed. As comparison of the numerical analysis and the experimental results, tendency of start-up characteristics had good agreements. This methodology of present study will be able to be used for the analysis of liquid rocket engines as a future work.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43254218","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 : 2018-12-31DOI: 10.15231/jksc.2018.23.4.029
Yoocheon Kim, Jai-ick Yoh
{"title":"A Hot Spot Based Shock to Detonation Transition Simulation using Multi-Scale Approach Part B - Hot Spot Based Multi-Scale Simulation -","authors":"Yoocheon Kim, Jai-ick Yoh","doi":"10.15231/jksc.2018.23.4.029","DOIUrl":"https://doi.org/10.15231/jksc.2018.23.4.029","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48281007","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 : 2018-12-31DOI: 10.15231/JKSC.2018.23.4.008
Ho-Young Song, Hongjip Kim
It has been known that oxygenates increase octane number of gasolines. There are MTBE and bio-ethanol known as typical oxygenates and a lot of increasing interests have been given to the researches on ETBE to alternate these oxygenates. In this study, the performance and emissions of fine particle number with changing ETBE contents and spark ignition timing in single cylinder engines have been studied. There were trends that oxygen contents and RON increased with increasing ETBE contents of gasolines. And the ignition delay became longer and the burning velocity was reduced with increasing oxygen contents. Net caloric value and RON of gasoline has affected BMEP and BSFC for various ignition timings. Knocking intensity sharply increased with advancing ignition timing, but the difference in the knocking intensity of high RON fuels was relatively low. And fine particle number emissions rapidly increased with advancing ignition timing.
{"title":"The Experimental Study about a Performance and Fine Particle Number Emissions with Several ETBE Contents and a Different Ignition Timing","authors":"Ho-Young Song, Hongjip Kim","doi":"10.15231/JKSC.2018.23.4.008","DOIUrl":"https://doi.org/10.15231/JKSC.2018.23.4.008","url":null,"abstract":"It has been known that oxygenates increase octane number of gasolines. There are MTBE and bio-ethanol known as typical oxygenates and a lot of increasing interests have been given to the researches on ETBE to alternate these oxygenates. In this study, the performance and emissions of fine particle number with changing ETBE contents and spark ignition timing in single cylinder engines have been studied. There were trends that oxygen contents and RON increased with increasing ETBE contents of gasolines. And the ignition delay became longer and the burning velocity was reduced with increasing oxygen contents. Net caloric value and RON of gasoline has affected BMEP and BSFC for various ignition timings. Knocking intensity sharply increased with advancing ignition timing, but the difference in the knocking intensity of high RON fuels was relatively low. And fine particle number emissions rapidly increased with advancing ignition timing.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49586648","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 : 2018-12-31DOI: 10.15231/JKSC.2018.23.4.023
Yoocheon Kim, Jai-ick Yoh
Empirical and phenomenological hydrodynamic reactive flow models, such as Ignition and Growth and Johnson-Tang-Forest, have been effective in predicting shock initiation and detonation characteristics of various energetic substances. These models utilize the compression and pressure properties of the reacting mixture for quantifying their reaction rates. However, it has long been known that shock initiation of detonation is controlled by local reaction sites called ‘hot spots.’ In this study, a hot spot model based on the temperaturedependent Arrhenius reaction rate is developed. The complex reaction process of target explosive is addressed by conducting the Differential Scanning Calorimetry (DSC) while the rate of reaction is determined using the Friedman isoconversional method.
经验和现象学流体动力学反应流模型，如Ignition and Growth和Johnson-Tang-Forest，已经有效地预测了各种含能物质的激波起爆特性。这些模型利用反应混合物的压缩和压力特性来量化它们的反应速率。然而，人们早就知道，爆炸的冲击起爆是由称为“热点”的局部反应部位控制的。在这项研究中，建立了一个基于温度依赖的阿伦尼乌斯反应速率的热点模型。用差示扫描量热法(DSC)分析了目标炸药的复杂反应过程，用弗里德曼等转换法测定了反应速率。
{"title":"A Hot Spot Based Shock to Detonation Transition Simulation using Multi-Scale Approach Part A - Extraction of Chemical Kinetics of Energetic Material -","authors":"Yoocheon Kim, Jai-ick Yoh","doi":"10.15231/JKSC.2018.23.4.023","DOIUrl":"https://doi.org/10.15231/JKSC.2018.23.4.023","url":null,"abstract":"Empirical and phenomenological hydrodynamic reactive flow models, such as Ignition and Growth and Johnson-Tang-Forest, have been effective in predicting shock initiation and detonation characteristics of various energetic substances. These models utilize the compression and pressure properties of the reacting mixture for quantifying their reaction rates. However, it has long been known that shock initiation of detonation is controlled by local reaction sites called ‘hot spots.’ In this study, a hot spot model based on the temperaturedependent Arrhenius reaction rate is developed. The complex reaction process of target explosive is addressed by conducting the Differential Scanning Calorimetry (DSC) while the rate of reaction is determined using the Friedman isoconversional method.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47858603","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 : 2018-12-31DOI: 10.15231/jksc.2018.23.4.039
Joon Ahn
A series of numerical simulations have been conducted for a combustion chamber of a water tube type boiler with dual partial-premixed burners. The burner was expected to give shorter flame to make the boiler be more compact. Two burners were predicted not to interact strongly so as to yield two semi-independent flames. 50% partial load operations were tried with 3 modes and the mode with lower burner was predicted to transfer heat to the combustion chamber most effectively.
{"title":"CFD Study on Combustion Chamber of Water-Tube Type Boiler with Dual Partial-Premixed Low NOx Burners","authors":"Joon Ahn","doi":"10.15231/jksc.2018.23.4.039","DOIUrl":"https://doi.org/10.15231/jksc.2018.23.4.039","url":null,"abstract":"A series of numerical simulations have been conducted for a combustion chamber of a water tube type boiler with dual partial-premixed burners. The burner was expected to give shorter flame to make the boiler be more compact. Two burners were predicted not to interact strongly so as to yield two semi-independent flames. 50% partial load operations were tried with 3 modes and the mode with lower burner was predicted to transfer heat to the combustion chamber most effectively.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48127366","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 : 2018-12-31DOI: 10.15231/jksc.2018.23.4.015
W. Song, D. Cha, Byung Gu In
Combustion instability of synthetic gas in a partially-premixed combustor has been numerically investigated by varying H2 percentage of the fuel composition. During predictions with utilization of a lumped network code, the effects of different flame transfer function (FTF) models, which include the 2 order filter model and the state space model, and acoustic boundary conditions have also been investigated. The predicted results quite agree well with the corresponding experimental ones.
{"title":"Combustion Instability Characteristics on Fuel Composition of a Partially-Premixed Flame","authors":"W. Song, D. Cha, Byung Gu In","doi":"10.15231/jksc.2018.23.4.015","DOIUrl":"https://doi.org/10.15231/jksc.2018.23.4.015","url":null,"abstract":"Combustion instability of synthetic gas in a partially-premixed combustor has been numerically investigated by varying H2 percentage of the fuel composition. During predictions with utilization of a lumped network code, the effects of different flame transfer function (FTF) models, which include the 2 order filter model and the state space model, and acoustic boundary conditions have also been investigated. The predicted results quite agree well with the corresponding experimental ones.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44718588","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 : 2018-12-31DOI: 10.15231/JKSC.2018.23.4.001
K. Lee
{"title":"A Study of a Premixed Methyl Decanoate/Air Flame under High Pressure","authors":"K. Lee","doi":"10.15231/JKSC.2018.23.4.001","DOIUrl":"https://doi.org/10.15231/JKSC.2018.23.4.001","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42269302","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 : 2018-09-30DOI: 10.15231/jksc.2018.23.3.043
C. Cha, H. Lee, S. Hwang
{"title":"A Study of the Effect of Diluted Hot Oxidant on MILD Combustion","authors":"C. Cha, H. Lee, S. Hwang","doi":"10.15231/jksc.2018.23.3.043","DOIUrl":"https://doi.org/10.15231/jksc.2018.23.3.043","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44768258","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}
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