• Title/Summary/Keyword: Stereoscopic PIV

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Development of a Stereoscopic Miniature PIV(MPIV) System (Stereoscopic Miniature PIV (MPIV) 시스템의 개발)

  • Kim S.H.;Chete1at O.;Kim K.C.
    • Proceedings of the KSME Conference
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    • 2002.08a
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    • pp.517-520
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    • 2002
  • Stereoscopic particle image velocimetry is a measurement technique to acquire of three dimensional velocity field by two cameras. With a laser sheet illumination, the third velocity component can be deduced by out-of-plane velocity components using a stereoscopic matching method. Industrial fluid flows are almost three dimensional turbulent flows, so it is necessary to use the stereoscopic PIV measurement method. However the existing stereoscopic PIV system seems hard to use since it is very expensive and complex. In this study we have developed a Stereoscopic Miniature PIV(MPIV) system based on the concept of the Miniature PIV system which we have already developed. In this paper, we address the design and some first experimental results of the stereoscopic PIV system. The Stereoscopic MPIV system features relatively modest performances, but is considerably smaller, cheaper and easy to handle. The proposed Stereoscopic MPIV system uses two one-chip-only CMOS cameras with digital output. Only two other chips are needed, one for a buffer memory and one for an interfacing logic that controls the system. Images are transferred to a personal computer (PC) via its standard parallel port. No extra hardware is required (in particular, no frame grabber board is needed).

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Three-Dimensional Characterization of Strong Recirculating Flow by Stereoscopic PIV

  • Ikeda, Yuji;Palero, Virginia;Sato, Kei;Nakajima, Tsuyoshi
    • Journal of the Korean Society of Combustion
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    • v.7 no.1
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    • pp.37-43
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    • 2002
  • Spray characteristics in the swirling flow were investigated by Stereoscopic PIV. Spatial spray structures were measured by PIV as well as PDA in order to understand stable flame stabilization. The feasibility study of Stereoscopic PIV in spray flame was also demonstrated. The size and location of recirculation flow were measured. The stereoscopic PIV could provide 3-D flow fluctuation that cannot be measured by convectional measurement systems.

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Performance Tests on Stereoscopic PIV and Stereoscopic PTV using Standard Images (표준영상을 이용한 스테레오 PIV와 스테레오 PTV의 성능비교)

  • Doh, D.H.;Hwang, T.G.;Cho, Y.B.;Pyun, Y.B.
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.1772-1777
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    • 2004
  • The performances of the newly constructed Stereoscopic PTV and Stereoscopic PIV which had been completed based on a 3D-PTV principle are tested using the Standard Images. Virtual images were produced for the benchmark tests of the constructed two Stereoscopic techniques. The arrangement of the two cameras was based on angular position. The calibration of cameras and the pair-matching of the three-dimensional velocity vectors were based on Genetic Algorithm based 3D-PTV technique. The Standard data of LES are on the impinged jet proposed by VSJ. It is shown that the results obtained by Stereoscopic PTV have better reliability than those by Stereoscopic PTV.

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Stereoscopic PIV (스테레오 PIV)

  • Doh, D.H.;Lee, W.J.;Cho, G.R.;Pyun, Y.B.;Kim, D.H.
    • Proceedings of the KSME Conference
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    • 2001.11b
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    • pp.394-399
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    • 2001
  • A new stereoscopic PIV is introduced. The system works with CCD cameras, stereoscopic photogrammetry, and a 3D-PTV principle. Virtual images are produced for the construction of a benchmark testing tool of PIV techniques. 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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Flow Analysis around a Floating Cylinder in a Swirl Flow with a Stereoscopic-PIV (스테레오 PIV에 의한 원관내 선회유동중 실린더형 부유체 주위 유동 특성 해석)

  • Doh, D.H.;Hwang, T.G.;Tanaka, K.;Takei, M.
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.319-322
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    • 2006
  • The flow characteristics around a floating cylinder in a swirling flow field in a vertical pipe with a length of 600mm and an inner diameter of 100mm is investigated by the use of the Stereoscopic-PIV system. The measurement system consists of two cameras, a Nd-Yag laser and a host computer. Optical sensors(LEDs) were used to detect the location of the floating cylinder and to activate the Stereoscopic-PIV system. A conditional sampling Stereoscopic-PIV system was developed in which the flow fields around the floating cylinder are measured at the events of the activations. It has been verified that the motion of the floating cylinder becomes stable when the azimuthal velocity component of the swirl flow is maintained at stable states.

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Dual-plane Stereoscopic PIV Measurement on the Lobed Jet Mixing Flow

  • SAGA Tetsuo;KOBAYASHI Toshio
    • 한국가시화정보학회:학술대회논문집
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    • 2001.12a
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    • pp.108-122
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    • 2001
  • In a continuing effect to study the mixmg enhancement by large-scale streamwise vortices in lobed mixing flows, an advanced PIV system named as dual-plane stereoscopic PIV system was used in the present study to conduct simultaneous vorticity (all three components) measurement of an air jet exhausted from a lobed nozzle. Unlike 'classical' 2-D PIV system or conventional 'single-plane' stereoscopic PIV system, the dual-plane stereoscopic PIV system used in the present study can obtain the flow velocity (all three components) fields at two spatially separated planes simultaneously. Therefore, it can provide the distributions of all the three components of vorticity vectors instantaneously and simultaneously. The evolution and interaction characteristics of the large-scale streamwise vortices and azimuthal Kelvin-Helmholtz vortices in the lobed jet mixing flow were revealed instantaneously and quantitatively from the measurement results of the dual-plane stereoscopic PIV system. The characteristics of the mixing process in the lobed jet mixing flow were analyzed based on the simultaneous measurement results of the steamwise vorticity and azimuthal Kelvin-Helmholtz vorticity distributions.

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Development and Application of a Miniature Stereo-PIV System (Miniature Stereo-PIV 시스템의 개발과 응용)

  • Kim, K.C.;Chetelat, Olivier;Kim, S.H.
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.27 no.11
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    • pp.1637-1644
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    • 2003
  • Stereoscopic particle image velocimetry is a measurement technique to acquire three dimensional velocity field by two cameras. With a laser sheet illumination, the third velocity component can be deduced from out-of$.$plane velocity components using a stereoscopic matching method. Most industrial fluid flows are three dimensional turbulent flows, so it is necessary to use the stereoscopic PIV measurement method. However the existing stereoscopic PIV system seems hard to use since it is very expensive and complex. In this study we have developed a Miniature Stereo-PIV(MSPIV) system based on the concept of the Miniature PIV system which we have already developed. In this paper, we address the design and some primitive experimental results of the Miniature Stereo-PIV system. The Miniature Stereo-PIV system features relatively modest performances, but is considerably smaller, cheaper and easy to handle. The proposed Miniature Stereo-PIV system uses two one-chip-only CMOS cameras with digital output. Only two other chips are needed, one for a buffer memory and one for an interfacing logic that controls the system. Images are transferred to a personal computer (PC) via its standard parallel port. No extra hardware is required (in particular, no frame grabber board is needed).

Stereoscopic micro-PIV measurements of jet flow (미세제트 유동의 Stereoscopic micro-PIV측정)

  • Yu, Cheong-Hwan;Kim, Hyoung-Bum
    • Journal of the Korean Society of Visualization
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    • v.5 no.1
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    • pp.43-48
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    • 2007
  • Micro-PIV(particle image velocimetry) has been widely used to measure the velocity of micro flow. Although this micro-PIV method can give accurate 2D instantaneous velocity information of mea-surement plane, it cannot resolve the out of plane component of velocity vectors. Lots of the micro fluidic devices generate three-dimensional flow and 3D measurement of velocity is useful to understand the physics of micro flow phenomena. In this study, we constructed stereoscopic micro-PIV(SMPIV) system and applied this method to the impinging micro jet flow. The results show that this method can produce accu-rate 3D reconstruction of micro jet flow.

Measurements of a Ship's Propeller Wake with Stereoscopic-PIV and Stereoscopic-PTV (스테레오 PTV와 스테레오 PIV에 의한 선박프로펠러 후류측정)

  • Doh, Deog-Hee;Hwang, Tae-Gyu;Lee, Sang-Joon
    • Journal of the Korean Society of Visualization
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    • v.5 no.2
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    • pp.26-32
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    • 2007
  • Stereoscopic PTV and Stereoscopic-PIV measurements have been carried out for the studies of the wake of a ship's propeller. Stereoscopic photogrammetry based on a 3D-PTV principle was introduced using two high-definition cameras(1k x 1k, 30Hz). The arrangement of the two cameras was based on angular position. The pair-matching of the three-dimensional velocity vectors were based on Genetic Algorithm based 3D-PTV technique. The results obtained by both measurement systems have been compared at the advance ratio J=0.88(290 rpm, d=54 mm). Turbulent properties have also been compared each other at the same condition.

Simultaneous Measurements of CH-OH PLIF and Stereoscopic PIV in Turbulent Premixed Flames (CH-OH PLIF와 Stereoscopic PIV동시계측에 의한 난류예혼합화염의 관찰)

  • Choi, Gyung-Min;Tanahashi, Mamoru;Miyauchi, Toshio
    • 한국연소학회:학술대회논문집
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    • 2004.11a
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    • pp.91-96
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    • 2004
  • Simultaneous CH and OH planar laser induced fluorescence(PLIF) and stereoscopic particle image velocimetry (PIV) measurements have been developed to investigate the local flame structure of turbulent premixed flames. The developed simultaneous two radical concentrations and three component velocity measurements on a two-dimensional plane was applied for relatively high Reynolds number turbulent premixed flames in a swirl stabilized combustor. All measurements were conducted for methane-air premixed flames in the corrugated flamelets regime. Strong three-dimensional fluctuation implies that misunderstanding of the flame/turbulent interactions would be caused by the analysis of two-component velocity distribution in a cross section. Furthermore, comparisons of CH-OH PLIF and three-component velocity field show that the burned gases not always have high-speed velocity in relatively high Reynolds number turbulent premixed flame. The Reynolds number dependence of the flame front was clearly captured by the simultaneous CH-OH PLIF and stereoscopic PIV measurements.

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