• 제목/요약/키워드: Phase Doppler Particle Analyzer (PDPA)

검색결과 84건 처리시간 0.03초

회전연료노즐 형상변경에 따른 분무특성 (Spray Characteristics of the Rotating Fuel Nozzle with Orifice Geometry)

  • 장성호;최현경;이동훈;유경원;최성만
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2008년도 제30회 춘계학술대회논문집
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    • pp.240-243
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    • 2008
  • 회전식 연료 노즐의 분무특성을 알기 위해서 고속회전 시험장치를 이용하여 실험적 연구를 수행하였다. 시험장치는 연료공급장치, 고속 회전장치 그리고 아크릴 케이스로 구성되어있다. Injection orifice의 직경 및 개수를 변화시켜가며 분무실험을 수행하였다. 액적의 크기 및 속도는 PDPA(Phase Doppler Particle Analyzer)시스템을 이용하여 측정하였다. 실험결과로부터 Injection orifice의 직경 및 개수변화에 따른 회전식 노즐의 분무특성을 이해 할 수 있었다.

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디젤 충돌 분무의 발달 과정 및 내부 유동 특성 (Internal Structure and Velocity Field of the Impinging Diesel Spray on the Wall)

  • 전문수;서현규;박성욱;이창식
    • 한국분무공학회지
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    • 제10권3호
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    • pp.1-8
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    • 2005
  • The purpose of this study is to investigate the internal structure of the impinged diesel spray at various experimental conditions. To examine the effect of various factors on the development of a diesel spray impinging on the wall, experiments were conducted at the various Injection pressures, wall distances from the nozzle tip and angles of wall inclination. The PIV system consists of a double pulsed Nd:YAG laser was utilized to analyze the internal flow structure of impinged diesel sprays. The velocity fields from the PIV system were compared with the results measured by the phase Doppler particle analyzer(PDPA)system. The results show that internal flow pattern of the impinged spray was similar with the results from the PDPA system. The radial velocity of the impinged spray was increased with the increase in the injection pressure and near the nozzle-wall distance. The generation of vortex was also promoted with the Increase in angles of wall inclination.

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위상 도플러 입자 분석기(PDPA)를 이용한 가솔린 포트 인젝터의 입자 크기 및 속도 프로파일에 관한 연구 (A Study on the Particle Size and Velocity Profile on a Gasoline Port Injector Using a Phase Doppler Particle Analyzers (PDPA))

  • 김효진;조현;삭다 통차이;임옥택
    • 한국수소및신에너지학회논문집
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    • 제28권3호
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    • pp.300-307
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    • 2017
  • This study is to investigate particle size and velocity profile of gasoline port injector using Phase Doppler Particle Analyzer (PDPA). In this experiment, a GV 250 Delphi port injector used for motorcycles was used for liquid injection. The injector consists of four holes and has a static flow rate of 2.13 g/s. The fuel used in the injection was N-heptane, which is similar to gasoline, as an alternative fuel. The test fuel was injected at an atmospheric temperature of $20^{\circ}C$ and an open atmosphere of 1 atm. The injection time was 10 ms and the injection pressure was 3.5 bar in PDPA experiment. The experimental target position was fiexd at 30, 50 and 75 mm from the nozzle tip and data were collected for a total of 10,000 samples. The experimental results show that the length diameter (D10), the Sauter mean diameter ($D_{32}$), and the mean droplet velocity (MDV) are $45-54{\mu}m$, $99-115{\mu}m$ and 15-21 m/s, respectively.

입자크기와 노즐형상이 입자유동특성에 미치는 영향 (Effects of Particle Size and Injector Geometry on Particle Dynamics)

  • 전운학;김종철;황승식
    • 한국자동차공학회논문집
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    • 제6권5호
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    • pp.97-103
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    • 1998
  • The flow structure of particles for two different injectors has been investigated experimentally by means of a Phase Doppler Particle Analyzer(PDPA). Two injectors used in the present study are the pipe and contraction nozzle. Particles of 0.8${\mu}{\textrm}{m}$, 30${\mu}{\textrm}{m}$, 60 ${\mu}{\textrm}{m}$, and 100${\mu}{\textrm}{m}$ diameter were injected with a constant mass loading ratio of 0.01 and a Reynolds number of 13200. The initial mean velocity and turbulent intensity of particle are strongly influenced by the particle size and the injector geometry. The flow angles of particle at nozzle exit are sensitive to the particle size rather than the injector geometry.

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작동 유체에 따른 단순 압력식 연료노즐의 분무특성 (Spray Characteristics of the Simplex Atomizer with Working Fluids)

  • 최채홍;임병준;최성만
    • 한국추진공학회지
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    • 제13권6호
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    • pp.41-47
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    • 2009
  • 작동 유체에 따른 APU 가스터빈에 적용되는 연료노즐의 분무특성을 확인하였다. 액체연료에 따라 점도, 표면장력 및 비중 등이 상이하여 분무특성이 변화될 수 있다. 본 연구에서는 연료 물성치 변화에 따른 분무특성을 이해하기 위하여 케로신과 유사한 특성을 갖는 보정 유체 2와 일반적으로 연료노즐의 분무특성을 시험하는데 사용하는 물을 이용하여 분무 시험을 수행하였다. 분무가시화와 분무입자 크기 및 분포를 ND-Yag 레이저 및 PDPA(Phase Doppler Particle Analyzer)를 이용하여 측정하였다. 분무시험 결과, 두 작동유체의 분무형태는 유사하게 나타났으며 주 분무영역에서의 SMD 또한 유사하게 분포됨을 확인할 수 있었다.

회전연료 분사시스템의 분열과정 (Disintegration Process of the Rotating Fuel Injector)

  • 장성호;이동훈;유경원;최성만
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2008년도 제31회 추계학술대회논문집
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    • pp.171-174
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    • 2008
  • 소형 회전연료 분사장치의 분열과정 특성을 연구하기 위한 실험적 연구를 수행하였다. 이러한 분열과정의 특성을 이해하기 위해 PDPA(Phase Doppler Particle Analyzer)시스템을 사용하여 분무입자의 크기와 속도를 측정하였다. 또한 Nd-Yag Laser를 광원으로 사용하여 분무를 가시화하였다. 실험결과 Injection Orifice로부터 생성된 액주는 회전수에 의해 지배되고, SMD(Sauter Mean Diameter)와 분무특성은 Injection Orifice의 직경에 큰 영향을 받는다는 것을 알 수 있었다.

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입자분리기 최적 설계를 위한 다상 유동 해석 (Analysis of Gas-Solid Flow for the Optimum Design of Coal Splitter)

  • 육심균;류제욱;이익형;이상룡
    • 대한기계학회논문집B
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    • 제27권11호
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    • pp.1604-1611
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    • 2003
  • The experimental investigation of a coal splitter used in the 500㎿(e) boilers of fossil power plant is carried out to validate the design criteria. To predict air flow and the amount of particles at the exit, velocity and the weight of particles are measured on test planes using the coal splitter model with two-dimensional phase doppler particle analyzer and the glass fiber filter. It is found that the position of guide plate influences significantly both flow rates of gas and particle at the exit. Gas flow rate was a linear function of the guide plate, whereas particle flow rate was a exponential function of it.

Size Measurements of Droplets Entrained in a Stagnant Bubbling Liquid Column

  • Jeong, Hae-Yong;No, Hee-Cheon;Song, Chul-Hwa;Chung, Moon-Ki
    • 한국원자력학회:학술대회논문집
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    • 한국원자력학회 1996년도 추계학술발표회논문집(1)
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    • pp.254-259
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    • 1996
  • Phase Doppler particle analyze. (PDPA) is a instrument which can be used to obtain simultaneous size and velocity measurements in a multiphase flow. In this study, the size of the water droplets entrained from a bubbling surface of a stagnant liquid column is measured by PDPA with a specially designed transmitter of long focal length and large beam diameter. The test section tube is made of acryle with 18 mm I.D. and 900 mm length. The experimental data are obtained for the air superficial velocity between 0.7 m/s to 3.4 m/s at atmospheric pressure. The experimental results show that there exists large difference in the entrainment mechanism between the churn-turbulent flow and annular flow. Through the present study, the phase Doppler analyzer system is shown to be successfully applied to measure particle sizes larger than $2,000\mu\textrm{m}$ if a transmitter of long focal length is utilized.

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PDPA계측에 의한 다공 디젤 노즐의 분무 미립화 특성에 관한 연구 (A Study on the Spray Atomization Characteristics of a Multi-Hole Diesel Nozzle using PDPA System)

  • 이지근;오제하;강신재;노병준
    • 한국분무공학회지
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    • 제4권1호
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    • pp.45-54
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    • 1999
  • The spray characteristics of a direct injection multi-hole diesel nozzle having the 2-spring nozzle holder were investigated by using the image processing system and a PDPA(phase Bowler particle analyzer) system. The spray tip penetration, the spray angle, and the droplet diameter and velocity with the variation of the pump speed, injection quantity were measured. From, the experiments, we know that there are small droplets which are not to be detected with spray image around the leading edge of the spray. In order to represent the mean characteristics of the intermittent spray very well, it is very important to set the time windows accurately. From the measurements along the axis of the spray, close to the nozzle, the initially injected droplets are overtaken by droplets that follow them. And also there are the maximum axial mean velocity and SMD at the following part of the leading edge of the spray.

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Turbulent Mixing Flow Characteristics of Solid-Cone Type Diesel Spray

  • Lee, Jeekuen;Shinjae Kang;Park, Byoungjoon
    • Journal of Mechanical Science and Technology
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    • 제16권8호
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    • pp.1135-1143
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    • 2002
  • The intermittent spray characteristics of the single-hole diesel nozzle (d$\sub$n/=0.32 mm) used in the fuel injection system of heavy-duty diesel engines were experimentally investigated. The mean velocity and turbulent characteristics of the diesel spray injected intermittently into the still ambient were measured by using a 2-D PDPA (phase Doppler particle analyzer) . The gradient of spray half-width linearly increased with time from the start of injection, and it approximated to 0.04 at the end of the injection. The axial mean velocity of the fuel spray measured along the radial direction was similar to that of the free air jet within R/b= 1.0-1.5 regardless of elapsing time, and its non-dimensional distribution corresponds to the theoretical velocity distributions suggested by Hinze in the downstream of the spray flow fields. The turbulent intensity of the axial velocity components measured along the radial direction represented the 20-30% of the U$\sub$cι/ and tended to decrease in the outer region. The turbulent intensity in the trailing edge was higher than that in the leading edge.