• Title/Summary/Keyword: Simulated Fuel

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Plant morphological symptom caused by simulated acidic rain made by fuel gases (排氣가스로 만든 人工酸性雨에 의한 植物의 形態的 症狀)

  • Chang, Nam-Kee;Yun-Sang Lee;Soo-Jin Yi
    • The Korean Journal of Ecology
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    • v.16 no.1
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    • pp.17-26
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    • 1993
  • We investigated the ph change of water caused by several fuel gases regarded as the main cause of the air pollution, To find out the main cause of increase of the acidity of the rain. We measured it while injrcting each fuel gas directiy to the distilled water. It was observed that bunker-c oil gas and anthracite coal gas were the main cause to make the ph of the solution lowest. We examined the effects of simulated acidic water solutions on several plant species. Simulated acidic rain made by bunker-c oil gas has significant symptom on the saxifraga stolonifera and commelina communis, while no injury was observed on plants exposed to simulated rainfall made by anthracite coal gas.

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A Study on the Structure of Turbulent non-Premixed Oxy-fuel Flame Using CMC Model-based Simulation (CMC 모델 기반 수치해석을 사용한 순산소 난류확산화염 구조 연구)

  • Kim, Jong-Soo;Sreedhara, S.;Huh, Kang-Yeol;Yang, Won
    • Journal of the Korean Society of Combustion
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    • v.13 no.1
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    • pp.31-43
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    • 2008
  • Oxy-fuel flame has a significantly different structure from that of air-fuel flame because of its high temperature. This study is aimed to find out the difference of the oxy-fuel flame structure in order to understand reaction mechanism closely, which is crucial to design real-scale oxy-fuel combustion system. By examining pictures of counterflow flame and LIF images, we found that oxy-fuel flame had two-zone structure: fuel decomposition region and distributed CO oxidation region. In the oxy-fuel flame, OH radical was distributed intensely through the whole flame due to its higher flame temperature than crossover temperature. For showing those features of the oxy-fuel flame, 1 MW scale IFRF oxy-natural gas burner was simulated by conditional moment closure(CMC) model. Calculation results were compared with experimental data, and showed agreements in trend. In the simulated distributions of fuel decomposition/CO oxidation rates, CO oxidation region was also separated from fuel decomposition zone considerably, which showed the two-zone structure in the oxy-fuel flame.

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1D Computer Simulation of Diesel Engine Intake Port Swirl Ratios Considering the Fuel Injection Timing Range (디젤 엔진 연료 분사 타이밍 구간에서의 흡기 포트 스월비 1D 컴퓨터 시뮬레이션)

  • Oh, Dae San;Lee, Choong Hoon
    • Journal of ILASS-Korea
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    • v.26 no.2
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    • pp.81-87
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    • 2021
  • This study was performed to calculate the swirl ratio of a diesel engine intake port by a 1D computer simulation under actual engine operating conditions. The swirl ratio of the intake port was simulated according to the change of the engine speed during the operation of the motoring without fuel injection. The swirl ratio of the intake port was simulated according to changes in the crank angle during the four-cycle operation of intake, compression, expansion and exhaust. The swirl ratio represented by the three regions of the piston, center and squish was simulated. Among the three regions, the piston-region swirl ratio is important for effective air-fuel mixing in the engine cylinder. In particular, it was confirmed during the simulation that the piston swirl ratio before and after the compression top dead center (TDC) point when fuel is injected in the DI diesel engine can have a significant effect on the mixing of air and fuel. It was desirable to set the average piston swirl ratio over a crank angle section before and after compression TDC as the representative swirl ratio of the cylinder head intake port according to the change of the engine speed.

Quantitative Analysis of Fuel in Engine Oil (엔진오일 내 연료성분 정량분석)

  • Lim, Young-Kwan;Kim, Jiyeon;Na, Yong-Gyu;Kim, Jong-Ryeol
    • Applied Chemistry for Engineering
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    • v.28 no.6
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    • pp.714-719
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    • 2017
  • The contaminated engine oil by fuel can intimidate driver safety due to vehicle problems such as engine abrasion, fire and sudden unintended acceleration. In this study, we investigate various functional properties of the engine oil contaminated with fuel. The test results indicated that the engine oil contaminated with fuel had relatively low values of the flash point, pour point, density, kinematic viscosity and cold cranking simulator. Furthermore, a four ball test suggested that the contaminated engine oil increased wear scar due to the poor lubricity. Moreover, SIMDIST (simulated distillation) using ASTM D2887 was applied to analyze fuel characteristics in an engine oil. The SIMDIST analysis result showed a lower carbon number, and the fuel was detected at an earlier retention time than that of using engine oil in chromatogram. Also, it is possible to quantitatively analyze for fuel contents in the engine oil. The SIMDIST method for the diagnosis of oil conditions can be used whether the fuel was involved or not, instead of analyzing other physical properties that require various analytical instruments, large volumes of oil samples, and long analysis time.

A Computer Simulation of Injection Rate Characteristics of Solenoid Type Common Rail Injector According to Injector Driving Current Patterns (인젝터 구동 전류 패턴 변화가 솔레노이드 타입 커먼레일 인젝터 분사율 특성에 미치는 영향에 대한 컴퓨터시뮬레이션)

  • Lee, Choong Hoon
    • Journal of ILASS-Korea
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    • v.24 no.3
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    • pp.114-121
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    • 2019
  • The effect of injector driving current pattern on fuel injection rate of solenoid diesel common rail injector was studied by computer simulation. The time resolved fuel injection rate and injected quantity per stroke of a common rail injector driven with the five current patterns were computer simulated. The fuel injection rate and injected quantity per stroke according to the rail pressure and fuel injection period were also computer simulated. When the common rail injector was driven with the five driving current patterns of peak & hold, there was no difference in the fuel injection rate in the peak section regardless of all the current patterns of the five cases. On the other hand, the magnitude of the hold current value influenced the injection rate and injected quantity per stroke. That is, in the current pattern of three cases where the hold current value is equal to or more than a constant value of the peak current value, the fuel injection rates for the given common rail rail pressure and injection period are same one another. On the other hand, the current pattern of the two cases, in which the hold current value is smaller than a certain value, there is a large fluctuation in the fuel injection rate.

Reprocessing of simulated voloxidized uranium-oxide SNF in the CARBEX process

  • Boyarintsev, Alexander V.;Stepanov, Sergei I.;Kostikova, Galina V.;Zhilov, Valeriy I.;Chekmarev, Alexander M.;Tsivadze, Aslan Yu.
    • Nuclear Engineering and Technology
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    • v.51 no.7
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    • pp.1799-1804
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    • 2019
  • The concept of a new method, the CARBEX (CARBonate EXtraction) process, was proposed for reprocessing of spent uranium oxide fuel. The proposed process is based on use of water solutions of $Na_2CO_3$ or $(NH_4)_2CO_3$ and solvent extraction (SE) by the quaternary ammonium compounds for selective recovery and purification of U from the fission products (FPs). Applying of SE allows to reach high degree of purification of U from FPs. Carrying out the processes in poorly aggressive alkaline carbonate media leads to increasing safety of SNF's reprocessing and better selectivity of separation of lanthanides and actinides. Moreover carbonate reprocessing media allows to carry out a recycling and regeneration of reagents. We have been done laboratory scale experiments on the extraction components of simulated voloxidated spent fuel in the solutions of NaOH or $Na_2CO_3-H_2O_2$ and recovery of U from carbonate solutions by SE method using carbonate of methyltrioctylammonium in toluene. It was shown that the purification factors of U from impurities of simulated FPs reached values $10^3-10^5$. The received results support our opinion that CARBEX after the further development can become more safe, simple and profitable method of spent fuel reprocessing.

Performance Evaluation of a Fiber-Optic Cerenkov Radiation Sensor System Using a Simulated Spent Fuel Assembly (사용후핵연료 집합체 모사장치를 이용한 광섬유 체렌코프 방사선 센서 시스템의 성능평가)

  • Shin, Sang Hun;Yoo, Wook Jae;Jang, Kyoung Won;Cho, Seunghyun;Park, Byung Gi;Lee, Bongsoo
    • Journal of Sensor Science and Technology
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    • v.23 no.4
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    • pp.245-250
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    • 2014
  • When the charged particle travels in transparent medium with a velocity greater than that of light in the same medium, the electromagnetic field close to the particle polarizes the medium along its path, and then the electrons in the atoms follow the waveform of the pulse which is called as Cerenkov light or radiation. This type of radiation can be easily observed in a spent fuel storage pit. In optical fibers, the Cerenkov light also can be generated due to their dielectric components. Accordingly, the radiation-induced light signals can be obtained using optical fibers without any scintillating material. In this study, to measure the intensities of Cerenkov radiation induced by gamma-rays, we have fabricated the fiber-optic Cerenkov radiation sensor system using silica optical fibers, plastic optical fibers, multi-anode photomultiplier tubes, simulated spent fuel assembly and a scanning system. To characterize the Cerenkov radiation generated in optical fibers, the intensities of Cerenkov radiation generated in the silica and plastic optical fibers were measured. Also, we measured the longitudinal distribution of gamma rays emitted from the Ir-192 isotope by using the fiber-optic Cerenkov radiation sensor system and simulated spent fuel assembly.