• Title/Summary/Keyword: Combustion bomb

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An Experimental Study on the Developement of Bomb Calorimeter (발열량 측정장치 개발에 관한 연구)

  • Lee, Dong-Je;Son, Young-Mog;Kang, Han-Saem;Kim, Hyung-Man
    • 한국연소학회:학술대회논문집
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    • 2001.06a
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    • pp.23-30
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    • 2001
  • Bomb calorimeter was developed for measuring the calorific value of combustible matter such as wastes. The calorimeter consist of bomb, stirred-water type bucket, thermometer and ignition circuit. Operation and performance of the calorimeter have been tested experimentally. In the present study, calorific values of light oil, lamp oil, benzoic acid, ethyl alcohol and methyl alcohol is measured using the bomb calorimeter. Mass of the sample is fixed at 19, and oxygen pressure in the bomb is used as an experimental parameter. Sample in the oxygen bomb is burned with electrically heated Ni-Cr wire of 100mm in length, and temperature of water in the bucket become increased by $2{\sim}5^{\circ}C$ during about 30min. Calorific value of the sample is calculated with the temperature difference of water. Combustion tests, such as the record of temperature history and the inspection of remnants, are performed at 6, 8 and 10 atm of the oxygen pressure. From the test results, oxygen pressure in the bomb must be over 10atm for complete combustion.

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Two-dimensional $O_2$ and OH Density Measurement Using Tunable KrF Excimer Laser Light a Combustion Bomb via Planar Laser Induced Predissociative Fluorescence and Laser Rayleigh Scattering (평면 선해리 레이저유도 형광법과 레이래이 분산법을 이용한 연소실내의 OH 및 $O_2$의 2차원적 농도측정)

  • 김경수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.2 no.4
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    • pp.91-99
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    • 1994
  • Tunable KrF Excimer Laser is used here for measuring OH and $O_2$ density distribustion in an open $H_2$/air premixed flame and in a combustion bomb. Laser Rayleigh Scattering(LRS) and Planar Laser Induced Predissociative Fluorescence(PLIPF) methods are used to obtain two-dimensional images of total and specific densities. Laser Excitation wavelengths are calibrated via flame images and combustion bomb images show good qualitative a greement with theoretical calculation. Furthermore images in a combustion bomb can be developed to study real Spark-Ignition engine combustions. Our experimental images show that there are no more collisional quenching problem at high pressure environment(including atmospheric pressure) using predissociative fluorescence technique. Further development to obtain two-dimensional temperature dustribution is ready to use eventhough it is not reported in this paper.

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Dual-Fuel Combustion Phenomena of Pilot Distillate Injected to Pre-mixed Natural Gas in a Constant Volume Combustion Bomb (천연가스가 예혼합된 정적연소실에 파일럿오일을 분사한 복합연소현상)

  • Choi, I.S.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.6
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    • pp.112-122
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    • 1995
  • As an alternative fuel producing less exhaust emissions, natural gas is of interest for use both in SI and CI engines. The potential of natural gas fuelled dual-fuel engine is considered high enough. However, much effort has to be made so that gaseous fuel is used efficiently with simultaneous minimum use of pilot oil. Hence, a simplified three-dimensional model, using a finite volume method in cylindrical coordinates, has been developed to facilitate an understanding of the dual-fuel combustion phenomena and to predict the complex interactions between the pilot distillate and natural gas. The computer model was calibrated by comparing it with the experimental results obtained from diesel engine like combustion bomb tests. In the pre-mixed natural gas combustion, the fuel burning was highly reliant on the injection condition and subsequent burning nature of the pilot distillate.

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A numerical study on the effects of swirl on turbulent combustion in a constant volume bomb (스월이 정적연소실의 난류연소에 미치는 영향에 관한 수치해석)

  • 정진은;김응서
    • Journal of the korean Society of Automotive Engineers
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    • v.13 no.1
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    • pp.66-74
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    • 1991
  • A multidimensional numerical simulation of turbulent combustion in a constant volume bomb is implemented to clarify the effects of swirl on combustion. This simulation includes the ICED-ALE numerical technique, the skew-upwind differencing scheme, the modified .Kappa.-.epsilon. turbulence model, and the combustion model of the Arrhenius type and the turbulence-mixing-control type. The calculations of the turbulent combustion with swirl are carried out. It shows that the results agree with the measurements allowably. Therefore, the effects of swirl on turbulent combustion are examined through the parametric study of swirl.

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An Experimental Study on the Developement of Bomb Calorimeter (발열량 측정장치 개발에 관한 연구)

  • Kim, Hyung-Man;Son, Young-Mog;Lee, Dong-Je
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.60-65
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    • 2001
  • Bomb calorimeter was developed for measuring the calorific value of combustible matter such as wastes. The calorimeter consist of bomb, stirred-water type bucket, thermometer and ignition circuit. Operation and performance of the calorimeter have been tested experimentally. In the present study, calorific values of light oil, lamp oil and bunker C oil is measured using the bomb calorimeter. Mass of the sample is fixed at lg, and oxygen pressure in the bomb is used as an experimental parameter. Sample in the oxygen bomb is burned with electrically heated Ni-Cr wire of 100mm in length, and temperature of water in the bucket become increased by $5^{\circ}C$ during about 30min. Calorific value of the sample is calculated with the temperature difference of water. Combustion tests, such as the record of temperature history and the inspection of remnants, are performed at 4, 6, 8 and 10 atm of the oxygen pressure. From the test results, oxygen pressure in the bomb must be over 10atm for complete combustion.

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Combustion Efficiency Estimation Method of Solid Propellants and the Effects of Grain Shape using Closed Bomb Test (CBT를 이용한 고체 추진제의 연소효율 도출 방법과 그레인 형상의 영향 분석)

  • Jonggeun Park;Hong-Gye Sung;Wonmin Lee;Eunmi Kim
    • Journal of the Korean Society of Propulsion Engineers
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    • v.26 no.6
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    • pp.53-61
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    • 2022
  • The estimation method of combustion efficiency has been introduced by using closed bomb test(CBT). The Noble-Abel equation of state was applied to consider the real gas effects to take account of high operation pressure about a couple of 100 atm. of CBT. The heat loss through the CBT wall was considered. The volume change of grain was calculated by applying form functions, which estimated combustion efficiency of 8 different gain shapes. The combustion estimation method proposed in this study was fairly validated by the comparision with the pressure-time history data of the CBT experiments. The effects of both grain shape and propellant loading density were analyzed.

A Study on the Ignition Delay of Fish Oil Using a Constant Volume Combustion Bomb (정용연소장치에 의한 어유의 착화지연에 관한 연구)

  • 서정주;왕우경;안수길
    • Transactions of the Korean Society of Automotive Engineers
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    • v.1 no.1
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    • pp.50-58
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    • 1993
  • The ignition delay of diesel oil and fish oil blended with diesel oils was investigated at various pressure and temperature conditions in a constant volume combustion bomb. The evaporation and combustion duration of diesel oil and fish oil blended with diesel oils were respectively different in high and low temperature. The dependence of ignition delay on the temperature was different in high and low temperature ranges which were divided at the 773K. The dependence of ignition delay on the pressure was almost linear, regardless of the test fuels at the constant temperature(863K). The ignition delay became longer as the blending rate of fish oil increased at the constant temperature and pressure, but it was especially short with 20% fish oil blended with diesel oils.

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Analysis of heavy metal in polymer materials by combustion ICP-AES Method (연소법 전처리에 의한 고분자 물질 중 중금속의 분석)

  • Lim, Heon-Sung;Lee, Bo-Reum;Lee, Sueg-Geun
    • Analytical Science and Technology
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    • v.23 no.6
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    • pp.615-618
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    • 2010
  • An oxygen bomb combustion procedure were studied for determination of heavy metal in polymer materials such as polyvinyl chloride and polypropylene by ICP-AES. This method is proposed as a rapid and simple sample preparation for decomposition of polymer containing certified contents of the analytes by teflon coated oxygen bomb combustion using different absorbing solution. The recoveries of metal were found to be 30~102% from absorbed solution by ICP-AES method using polypropylene certified reference material(PP CRM-As, Ba, Cd, Hg, Pb, Zn). The recoveries of metal using PVC CRM(Cd, Hg, Pb) was found to be 45 ~101% with same procedures.

Modeling the Dual-Fuel Combustion of Natural Gas and Pilot Distillate Injected Directly into a Diesel Combustion Bomb (디젤연소용기에 직접분사된 천연가스와 파일럿오일의 복합연소 모델링)

  • 최인수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.4 no.1
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    • pp.155-164
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    • 1996
  • Dual-fuel engines are being researched with emphasis on the possible types of natural gas supply systems. Hence, a three-dimensional combustion model by using finite volume method was developed to provide a fundamental understanding of the auto-ignition of pilot distillate and subsequent burning of natural gas, when the natural gas as well as the distillate was directly injected into a quiescent diesel engine like combustion bomb tests and the numerical results were investigated for the mixed combustion phenomena. With high-pressure natural gas injection, it was found that the gaseous fuel injection characteristics had to be well harmonised with that of the pilot distillate. For better combustion efficiency, however, further researches are required for the optimisation of injection system in the existence of air motion.

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Characterization of bromine and chlorine in the closed combustion system (연소 반응기를 이용한 브롬 및 염소의 함량 측정에 관한 연구)

  • Choi, Ki-In;Kwon, Duck-Jun;Bae, Sung-Jin;Lee, Dong-Hoon
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.21 no.6
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    • pp.274-279
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    • 2011
  • In this study, we investigated the analytical methods for bromine (Br) and chloride (Cl) with oxygen combustion bomb, using a halogen-containing polymer materials. On measuring Cl content, it showed less reproducibility of the results applying Mohr method or potentiometric titration method than those applying acid-base titration method. In both Br and Cl tests with an oxygen combustion bomb, their concentrations in the absorption and cleaning solution with distilled water were much higher than those in the combustion gas. On the other hand, the concentration level of Br measured by the oxygen combustion bomb method were a little bit lower than those measured by XRF or combustionion chromatography.