• Title/Summary/Keyword: 부탄 유동

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Development of Signal Processing Technique of Digital Speckle Tomography for Analysis of Three-Dimensional Density Distributions of Unsteady and Asymmetric Gas Flow (비정상 비대칭 기체 유동의 3차원 밀도 분포 분석을 위한 디지털 스펙클 토모그래피 기법의 신호 처리 기술 개발)

  • Baek, Seung-Hwan;Kim, Yong-Jae;Ko, Han-Seo
    • Journal of the Korean Society for Nondestructive Testing
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    • v.26 no.2
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    • pp.108-114
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    • 2006
  • Transient and asymmetric density distributions of butane flow have been investigated from laser image signals by developed three-dimensional digital speckle tomography. Moved signals of speckles have been captured by multiple CCD images in three angles of view simultaneously because the flows were asymmetric and transient. The signals of speckle movements between no flow and downward butane flow from a circular half opening have been calculated by a cross-correlation tracking method so that those distances can be transferred to deflection angles of laser rays fur density gradients. The three-dimensional density fields have been reconstructed from the fringe shift signal which is integrated from the deflection angle by a real-time multiplicative algebraic reconstruction technique (MART).

Reconstruction of Density Distribution for Unsteady and Asymmetric Flow Using Three-dimensional Digital Speckle Tomography (3차원 디지털 스펙클 토모그래피를 이용한 비정상 비대칭 유동의 밀도 분포 재건)

  • Kim, Yong-Jae;Ko, Han-Seo;Baek, Seung-Hwan
    • 한국가시화정보학회:학술대회논문집
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    • 2006.12a
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    • pp.21-24
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    • 2006
  • Transient and asymmetric density distributions have been investigated by a digital speckle tomography with a novel integration method. Multiple CCD images captured movements of speckles in three angles of view simultaneously because the flows were asymmetric and unsteady. The speckle movements which have been formed by a ground glass between no flow and downward butane flow from an elliptical nozzle have been calculated by a cross-correlation tracking method so that those distances can be transferred to deflection angles of laser rays for density gradients. A novel integration method has been developed to obtain projection data from the deflection angles for the speckle tomography. The unsteady density fields have been reconstructed from the accurate projection values by the digital speckle tomography method using the developed integration method.

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Analysis of Unsteady and Asymmetric Flows Using Digital Speckle Tomography with Developed Integration Method (개발된 적분법을 포함하는 디지털 스펙클 토모그래피 기법을 이용한 비정상 비대칭 유동 분석)

  • Baek, Seung-Hwan;Kim, Yong-Jae;Ko, Han-Seo
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.517-518
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    • 2006
  • Transient and asymmetric density distributions have been investigated by three-dimensional digital speckle tomography with a novel integration method. Multiple CCD images captured movements of speckles in three angles of view simultaneously because the flows were asymmetric and unsteady. The speckle movements which have been formed by a ground glass between no flow and downward butane flow from a circular half opening have been calculated by a cross-correlation tracking method so that those distances can be transferred to deflection angles of laser rays for density gradients. A novel integration method has been developed to obtain projection data from the deflection angles for the speckle tomography.'The three-dimensional density fields have been reconstructed from the accurate projection values by a real-time multiplicative algebraic reconstruction technique (MART) with the developed integration method.

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Fuel Concentration Measurements by Laser Rayleigh Scattering (레이저 Rayleigh 산란을 이용한 연료농도의 계측)

  • Kwon, Soon-Tae;Kim, Hyeong-Sig;Lee, Jae-Won;Park, Chan-Jun;Ohm, In-Young
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 2008.04a
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    • pp.199-205
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    • 2008
  • In this study, a system to measure continuously the fuel concentration in a steady flow rig on the basis of Rayleigh scattering is presented. The system can be employed to measure both the temporal and the spatial distribution. Also, it is possible to calibrate the system for the measurement of accurate absolute concentration. Firstly, the system was tested at a calibration chamber for the determination of scattering cross section from propane, butane, acetylene, Freon-12 and Genetron 143a. After this, the system was adapted to a steady flow rig to measure the temporal and spatial fuel concentration. The rig is composed of cylinder head, intake manifold, injector, and transparent cylinder which can simulate internal combustion engine. To cope with the problem of Mie scattering interference, a software filter was developed, which is based on the rise time and the time constant of the photomultiplier-amplifier system. The results show that LRS can provide useful informations about concentration field and the software filter is very effective method to remove Mie interference.

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Fuel Concentration Measurements by Laser Rayleigh Scattering (레이저 Rayleigh 산란을 이용한 연료농도 계측시 잡음원인과 대책)

  • Kwon, Soon-Tae;Lee, Jae-Won;Park, Chan-Jun;Ohm, In-Young
    • Journal of Energy Engineering
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    • v.17 no.4
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    • pp.189-197
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    • 2008
  • In this study, a system to measure continuously the fuel concentration in a steady flow rig on the basis of Rayleigh scattering is presented. The system can be employed to measure both the temporal and the spatial distribution. Also, it is possible to calibrate the system for the measurement of accurate absolute concentration. Firstly, the system was tested at a calibration chamber for the determination of scattering cross section from propane, butane, acetylene, Freon-12 and Genetron 143a. After this, the system was adapted to a steady flow rig to measure the temporal and spatial fuel concentration. The rig is composed of cylinder head, intake manifold, injector, and transparent cylinder which can simulate internal combustion engine. To cope with the interference of Mie scattering, which is main obstacle of the measuring concentration with Rayleigh scattering, a hardware filter was installed for reducing the number density of particles. Furthermore a software filter was developed, which is based on the rise time and the time constant of the photomultiplier-amplifier system. In addition, background noisy was reduced by adjusting the optical array and applying the pin hall and beam trap. The results show that LRS can provide useful information about concentration field and the software filter is very effective method to remove Mie interference.

A Study on the Formation of Hydrate Plugging due to water molecules in High Pressure and Low Temperature Gas Pipeline (고압$\cdot$저온 가스 배관에서 수분에 의한 하이드레이트 플러깅 형성)

  • Lee J. H.;Baek Y. S.;Sung W. M.
    • Journal of the Korean Institute of Gas
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    • v.6 no.1 s.17
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    • pp.38-45
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    • 2002
  • Hydrates are solid cryctallines resembling ice in appearance, which are consist of a gas molecule surrounded by a cage of water molecules. Because of containning a large amount of methane, hydrates have been considered as a future energy resource. However, the formation of hydrates in the oil and gas industries has been known as a serious problem for a long time. The formation of hydrate in pipeline is common in seasonally cold or sub-sea environments with low temperatures and high pressures. Especially, hydrate plug formation becomes a real menace to flow assurance in inadequately protected transmission lines. This study was carried out for the purpose of understanding mechanism of hydrate plugging and examining formation conditions of hydrate in high pressure gas pipeline. In this study, we measured hydrate equilibrium conditions under the various flowing conditions with the methane. The results were presented both the plugging tendency and the effect of flowing velocity.

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