• Title/Summary/Keyword: Planar Laser-Induced Fluorescence(PLIF)

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An Experimental Investigation of Air Fuel Ratio Measurement using Laser Induced Acetone Fluorescence (아세톤 형광을 이용한 공연비 측정 기법 연구)

  • Park Seungjae;Huh Hwanil;Oh Seungmook
    • Proceedings of the KSME Conference
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    • 2002.08a
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    • pp.353-356
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    • 2002
  • Planar laser induced fluorescence(PLIF) has been widely used to obtain two dimensional fuel distribution. Preliminary investigation was performed to measure quantitative air excess ratio distribution in an engine fueled with LPG. It is known that fluorescence signal from acetone as a fluorescent tracer is less sensitive to oxygen quenching than other dopants. Acetone was excited by KrF excimer laser (248nm) and its fluorescence image was acquired by ICCD camera with a cut-of filter to suppress Mie scattering from the laser light. For the purpose of quantifying PLIF signal, an image processing method including the correction of laser sheet beam profile was suggested. Raw images were divided by each intensity of laser energy and profile of laser sheet beam. Inhomogeneous fluorescence images scaled with the reference data, which was taken by a calibration process, were converted to air excess ratio distribution. This investigation showed instantaneous quantitative measurement of planar air excess ratio distribution for gaseous fuel.

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Planar Laser-Induced Fluorescence (PLIF) Measurements of a Pulsed Electrothermal Plasma Jet

  • Kim, Jong-Uk;Kim, Youn J.;Byungyou Hong
    • Journal of Mechanical Science and Technology
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    • v.15 no.12
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    • pp.1808-1815
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    • 2001
  • The characteristics of a pulsed plasma jet originating from an electrothermal capillary discharge have been investigate using laser-induced fluorescence (LIF) measurement. Previous emission measurements of a 3.1 kJ plasma jet show trial upstream of the Mach disk the temperature and electron number density are about 14,000 K and and 10$\^$17/ cm$\^$-3/, while downstream of the Mach dick tole values are about 25,000 K and 10$\^$18/ cm$\^$-3/, respectively. However, these values are barred on line-of-sight integrated measurements that may be misleading. Hence, LIF is being used to provide both spatially and temporally resolved measurements. Our recent work has been directed at using planar laser-induced fluorescence (PLIF) imaging of atomic copper in the plasma jet flow field. Copper is a good candidate for PLIF studies because it is present throughout the plasma and has electronic transitions that provide an excellent pump-detect strategy. Our PLIF results to date show that emission measurements may give a misleading picture of the flow field, as there appeals to be a large amount of relatively low temperature copper outside the barrel shock. which may lead to errors in temperature inferred from emission spectroscopy. In this paper, the copper LIF image is presented and at the moment, relative density of atomic copper, which is distributed in the upstream of the pulsed plasma jet, is discussed qualitatively.

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Acetone PLIF for Fuel Distribution Measurements in Liquid Phase LPG Injection Engine (LPG 액상분사 엔진에서 아세톤 PLIF를 이용한 연료분포 측정기법 연구)

  • 오승묵;박승재;허환일;강건용;배충식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.1
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    • pp.74-82
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    • 2004
  • Planar laser-induced fluorescence(PLIF) has been widely used to obtain two dimensional fuel distribution. Acetone PLIF is chosen because fluorescence signal from acetone as a fluorescent tracer is less sensitive to oxygen quenching than other dopants. Acetone PLIF is applied to measure quantitative air excess ratio distribution in an engine fueled with LPG. Acetone is excited by KrF excimer laser (248nm) and its fluorescence image is acquired by ICCD camera with a cut-off filter to suppress Mie scattering from the laser light. For the purpose of quantifying PLIF signal, an image processing method including the correction of laser sheet beam profile is suggested. Raw images are divided by each intensity of laser energy and profile of laser sheet beam. Inhomogeneous fluorescence images scaled with the reference data, which is taken by a calibration process, are converted to air excess ratio distribution. This investigation shows instantaneous quantitative measurement of planar air excess ratio distribution for gaseous fuel.

Quantitative Acetone PLIF Measurement of Fuel Distribution in a Gas Turbine Combustor Burner (아세톤 PLIF를 이용한 가스터빈 연소기 버너 출구 연료분포의 정량적 측정)

  • Jeon, Woo-Jin;Kim, Hyung-Mo;Lee, Kang-Yeop;Yang, Su-Seok
    • Journal of the Korean Society of Combustion
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    • v.15 no.4
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    • pp.43-52
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    • 2010
  • A non-intrusive measurement, Planar Laser Induced Fluorescence was employed to visualize and measure the fuel distribution of the non-reacting field at the burner exit of gas turbine combustor. Measurement techniques, image processing method and quantification procedure were presented. Also, concentration measurement with gas analyzer was carried out to verify the propriety of PLIF result. The PLIF result coincides well with gas analyzer measurement result. PLIF test result for several other conditions are mentioned as well.

Study on the Fuel Vapor Distribution of the Stratified Charge in a DISI Engine by PLIF Technique (직분식 전기점화 엔진에서 PLIF기법에 의한 성층 혼합기의 분포특성 연구)

  • Kim, S.S.
    • Journal of Power System Engineering
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    • v.12 no.6
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    • pp.64-69
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    • 2008
  • The spatial fuel distribution of the stratified charge of a high pressure 6-hole injector was examined in a single cylinder optical direct injection spark ignition(DISI) engine. The effects of in-cylinder charge motion, and fuel injection pressure, and coolant temperature were investigated using a planar LIF(Laser Induced Fluorescence) technique. It was confirmed that the in-cylinder tumble flow played more effective role in the spatial fuel distribution of the stratified charge than the swirl flow during the compression stroke and the fuel distribution area increased due to the activation of the fuel vaporization by the increase of the coolant temperature. But, the increase of the fuel supplying pressure could not change the pattern of the fuel vapor distribution against the expectation.

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A Study on the Turbulent Characteristics of Rushton Turbine Mixer by Simultaneous Measurement of Velocity and Concentration Field with Stereo-PIV/PLIF Technique (Stereo-PIV/PLIF의 속도장과 농도장 동시측정 기법을 이용한 러쉬톤 교반기내 난류특성에 관한 연구)

  • Min, Young-Uk;Kim, Yun-Gi;Kim, Kyung-Chun
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.694-699
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    • 2003
  • Simultaneous measurement with PLIF(Planar Laser-Induced Fluorescence) and Stereo-PIV(Stereoscopic Particle Image Velocimetry) was performed to investigate the structural characteristics of flow field in Rushton Turbine Mixer. Instantaneous 3D velocity fields are measured by two 2K ${\times}$ 2K CCD cameras focused on an object plane with the angular displacement methods while the concentration fields are obtained through the measurement of the fluorescence intensity of Rhodamine B tracer excited by the second pulse of Nd:Yag laser light. Image distortion due to the camera view-angle is compensated by a mapping function. Finally, the spatial structures of turbulent mixing around Rushton turbine were identified by the calculation of cross-correlation fields between the velocity and concentration field.

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Aspects of Mixture Formation in a Swirl Type GDI Engine (스월형 GDI 엔진의 연료혼합특성 연구)

  • 김기성;박상규
    • Journal of Advanced Marine Engineering and Technology
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    • v.27 no.2
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    • pp.260-271
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    • 2003
  • For the Purpose of understanding the mixing phenomena of a GDI(Gasoline Direct Injection) engine, the spray behaviors and fuel distributions were investigated in a single cylinder transparent GDI engine. The experimental engine is a swirl type GDI engine with a SCV(Swirl Control Valve). PLIF(Planar Laser Induced Fluorescence) system with KrF Excimer laser was used for the measurement of the fuel distributions. The effects of SCV opening angles and the injector specifications on the fuel distribution characteristics were investigated. As a result, it was found that the SCV opening angle had a great effect on the fuel distributions in the late stage of compression process by changing the flow fields in the combustion chamber.

Analysis of the Spray Distribution Characterization of Impinging Jet Injectors for Liquid Rockets Using PLIF Technique (PLIF 기법을 이용한 액체로켓용 충돌분사 인젝터의 분무분포 특성 해석)

  • 정기훈;윤영빈;황상순
    • Journal of the Korean Society of Propulsion Engineers
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    • v.4 no.1
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    • pp.36-45
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    • 2000
  • Most researches for impinging jet spray have been focused on under-standing the breakup mechanism of a liquid sheet formed by the collision of jets and modeling the spray breakup using experimental data. For this reason, there have been few studies on the characteristics of the spatial spray distribution which affects significantly the combustion efficiency. Hence, we measured the radial distribution of fuel massflux using a like-doublet type injector. Instead of PDPA(Phase Doppler Particle Analyzer) which has been used only for the point measurement of the drop size of spray, PLIF(Planar Laser Induced Fluorescence) technique was developed lot the 2-D measurement of the massflux distribution of spray Indirect photography technique was also used to verify PLIF data.

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LIF/PLIF Measurements of OH Concentration in Flames (LIF/PLIF를 이용한 화염에서의 OH농도 측정)

  • 이원남
    • Journal of the KSME
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    • v.33 no.12
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    • pp.1031-1042
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    • 1993
  • 연소현상에 대한 이해를 증가시키기 위하여 화염을 이용한 많은 실험적 연구가 이루어져 왔다. 특히 연소 모델의 개선과 증명을 위하여는 화염에서의 성분 농도 측정이 필수적이며, 최근에 들어 측정 가능해진 래디컬성분의 측정은 연소해석분야에 많은 진전을 가져왔다. OH, H 및 O는 연료의 분해 (decomposition) 및 연소 산화물생성 이외에도 CO와 NO 같은 공해물질의 형성등 연소과정에서 매우 중요한 래디컬들이며, 특히 화염영역에서의 OH의 전파(transport)는 화염의 점화 및 안정성 (stability)에도 큰 영향을 미친다. OH래디컬은 연소과정에서 가장 중요한 성분 중 하나이며, 또한 스펙트럼이 비교적 잘 알려져 있어 레이저 유도 형광의 적용이 용이하므로 화염에서의 OH농도 측정에 LIF(laser induced fluorescence) 또는 PLIF(planar laser induced fluorescence)가 널리 사용되고 있다. 따라서 LIF 및 PLIF의 원리 및 연소분야에서의 응용을 OH농도 측정을 중심으로 소개하고자 한다.

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Measurement of the fuel distribution in a scaled ATR combustor using PLIF (PLIF를 이용한 ATR 연소기 축소모형의 연료분포 측정연구)

  • Jin Yu-In;Yang In-Young;Choi Young-Hwan;Yang Soo-Seok
    • Journal of the Korean Society of Propulsion Engineers
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    • v.9 no.4
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    • pp.55-65
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    • 2005
  • Mixing performance between fuel and oxidizer is a significant parameter of combustion efficiency and stability in an air-turbo ramjet combustor. Two types of petal mixer were experimented to research the mixing performance. Mixing performance and fuel distribution images were obtained for petal mixers. Planar laser-induced fluorescence(PLIF) was used to obtain 2-D fuel distribution. The obtained images were processed in order to make use of the image information to a quantitative level. The results of analyzing the fluorescence images could be useful to find better mixing performance between mixers.