• Title/Summary/Keyword: PIV

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Measurement of the Velocity field of Rotor-Stator in a Centrifugal Turbine Pump by Using PIV (PIV를 이용한 터빈펌프의 동${\cdot}$정익 속도장 계측)

  • Im, Yu-Cheong;Seo, Min-Sik;Lee, Young-Ho
    • 유체기계공업학회:학술대회논문집
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    • pp.11-18
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    • 1998
  • The present experimental study is focused on the application of multi-point simultaneous measurement by PIV(Particle Image Velocimetry) to rotor-stator region within centrifugal turbine pump. Six different kinds of rpm(120, 500, 1000, 1500, 2000 and 2500) are selected as experimental condition. Optimized cross correlation identification to obtain velocity vectors is implemented by direct calculation of correlation coefficients. Fine optical setup deeply concerned with PIV performance is arranged for accurate PIV measurement of high-speed complex flow. The instantaneous and time-mean velocity distribution and velocity profile are represented quantitatively at the rotor and stator region.

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Flow Characteristics of Guide Vane of Diffuser Pump by PIV Measurement (PIV계측에 의한 디퓨져펌프 안내깃에서의 유동특성)

  • Kim, J.H.;Choi, J.W.;Kim, M.Y.;Lee, H.;Lee, Young-Ho
    • Proceedings of the KSME Conference
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    • pp.391-396
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    • 2000
  • The present experimental study is focused on the application of multi-point simultaneous measurement by PIV(Particle Image Velocimetry) to guide vane region within a diffuser pump. Various different kinds of clearance were selected as experimental conditions. Optimized cross correlation identification to obtain velocity vectors was implemented with direct calculation of correlation coefficients. Fine optical setup important in PIV performance is arranged for the accurate PIV measurement of high-speed complex flow. Various flow patterns are represented quantitatively at the stator passages.

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A Study on Flow and Efficiency Characteristics in Guide Vane of Diffuser Pump Using PIV Measurement (PIV 계측을 이용한 디퓨져펌프의 정익에서의 성능과 유동특성에 관한 연구)

  • Kim, J. H.;Choi, M. S.;Kim, J. G.;Lee, Young-Ho
    • 유체기계공업학회:학술대회논문집
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    • pp.29-35
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    • 2000
  • The present experimental study is focused on the application of multi-point simultaneous measurement by PIV(Particle Image Velocimetry) to guide vane region within diffuser pump. Various different kinds of rotational velocity were selected as experimental condition. Optimized cross correlation identification to obtain velocity vectors is implemented with direct calculation of correlation coefficients. Fine optical setup concerned with PIV performance is arranged for the accurate PIV measurement of high-speed complex flow. Variable flow pattern are represented quantitatively at the stator region.

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Measurement of the Velocity Field of Rotor-Stator in a Centrifugal Turbine Pump Using PIV (PIV를 이용한 터빈펌프의 동${\cdot}$정익 속도장 계측)

  • Im, Yu-Cheong;Seo, Min-Sik;Lee, Young-Ho
    • The KSFM Journal of Fluid Machinery
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    • v.2 no.1
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    • pp.35-42
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    • 1999
  • The present experimental study is focused on the application of multi-point simultaneous measurement by PIV(Particle Image Velocimetry) to rotor-stater region within centrifugal turbine pump. Six different kinds of rpm(120, 500, 1000, 1500, 2000 and 2500) are selected as experimental condition. Optimized cross correlation identification to obtain velocity vectors is implemented with direct calculation of correlation coefficients. Fine optical setup concerned with PIV performance is arranged for the accurate PIV measurement of high-speed complex flow. The instantaneous and time-mean velocity distribution and velocity profile are represented quantitatively at the rotor and stator region.

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PIV measurements of a microfluidic elements fabricated in a plastic chip (플라스틱 미소유체요소 내부유동의 PIV 측정)

  • Lee, In-Won;Choi, Jay-Ho;Lee, In-Seop
    • Proceedings of the KSME Conference
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    • pp.400-404
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    • 2001
  • A micro-PIV(particle image velocimetry) measurement has been conducted to investigate flow fields in such microfluidic devices as microchannels and micronozzle. The present study employs a state-of-art micro-PIV system which consists of epi-fluorescence microscope, 620nm diameter fluorescent seed particles and an 8-bit megapixel CCD camera. Velocity vector fields with a resolution of $6.7\times6.7{\mu}m$ has been obtained, and the attention has been paid on the effect of varying measurement conditions of particle diameter and particle concentration on the resulting PIV results. In this study, the microfluidic elements were fabricated on plastic chips by means of MEMS processes and a subsequent molding process. Flow fields in a variety of microchannels as well as micronozzle have been investigated.

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Development of Stereocopic-PIV and its Application to the Measurement of the Near Wake of a Circular Cylinder (Stereocopic-PIV 개발과 원주근접 후류 계측)

  • Doh, D.H.;Kim, D.H.;Cho, G.R.;Lee, W.J.;Pyun, Y.B.
    • Proceedings of the KSME Conference
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    • pp.555-559
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    • 2001
  • A new stereoscopic PIV is developed using two CCD cameras, stereoscopic photogrammetry, and a 3D-PTV principle. The wake of a circular cylinder is measured by the developed stereoscopic PIV technique. The B mode vortical structure of the wake over the Reynolds number 300 is clearly seen by the developed technique. The arrangement of the two cameras is based on angular position. The calibration of cameras and the pair-matching of the three-dimensional velocity vectors are based on 3D-PTV technique.

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PIV Measurements of the Pressure Driven Flow Inside a T-Shaped Microchannel Junction (T헝 마이크로채널 연결부 압력구동 유동의 PIV계측)

  • Choi Jayho;Lee In-Seop
    • Journal of the Korean Society of Visualization
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    • v.1 no.1
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    • pp.75-81
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    • 2003
  • A custom micro-PIV optics assembly has been used to measure the flow fold inside a T-junction of a microchannel. The micro-PIV system consists of microscope objectives of various magnifications, a dichroic cube, and an 8-bit CCD camera. Fluorescent particles of diameters 620 nm have been used with a Nd:YAG laser and color filters. A programmable syringe pump with Teflon tubings were used to inject particle-seeded distilled water into the channel at flow rates of 2.0, 4.0, 6.0 mL/hr. The micro-channels are fabricated with PDMS with a silicon mold, then O$_{2}$ -ion bonded onto a slide glass. Results show differences in flow characteristics and resolution according to fluid injection rates, and magnifications, respectively. The results include PIV data with vector-to-vector distances of 2 $\mu$m with 32 pixel-square interrogation windows at 50$\%$ overlap.

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A Study on Flow Characteristics and Efficiency in Guide Vane of Diffuser Pump Using PIV Measurement (PIV를 이용한 디퓨저펌프 정익에서의 성능과 유동특성에 관한 연구)

  • 김정환;김범석;김진구;함승덕;이영호
    • Journal of Advanced Marine Engineering and Technology
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    • v.27 no.5
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    • pp.633-640
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    • 2003
  • The present experimental study is focused on the application of multi-point simultaneous measurement by PIV(Particle Image Velocimetry) to guide vane region within diffuser pump. Various different kinds of rotational velocity were selected as experimental condition. Optimized cross correlation Identification to obtain velocity vectors is implemented with direct calculation of correlation coefficients. Fine optical setup concerned with PIV performance is arranged for the accurate PIV measurement of high-speed complex flow. Variable flow pattern are represented quantitatively at the stator region.

Papers : A Study on the Characteristics of the Ramjet Engine Combustor using a Two Color PIV Technique (논문 : Two Color PIV 기법을 이용한 램제트엔진 연소기 특성에 대한 연구)

  • An,Gyu-Bok;Yun,Yeong-Bin;Jeong,In-Seok;Heo,Hwan-Il
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.1
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    • pp.95-104
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    • 2002
  • A two color PIV technique has been developed for visualization of complex and high speed flow in a ramjet combustor. Two color PIV has the advantages that velocity distribytions in high speed flowfields can be measured simply by varying the time interval between two different laser beams and a directional ambiguity problem can be solved by color separation, and then a singnal-to-noise ratio can be increased through nearly perfect cross-correlation. As a basic research of the ramjet engine, a 2-D shaped combustor with two symmetric air intakes has been manufactured and an experimental study has been conducted using a two color PIV technique. The flow characteristics such as recirculation zones and two intake air mixing have been investigated varying inlet angles and dome heights. It is found that the size and air mass ratio of reciculation zones are affected mainly by an inlet angle, but not much by a dome height.