Particle tracking velocimetry: an automatic image processing algorithm

Khalighi, Bahram; Lee, Yong H.

doi:10.1364/ao.28.004328

Cited by 42 publications

(9 citation statements)

References 3 publications

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“…Two separate image analysis algorithms were used to extract velocities from the PTV images. These were: (1) a fully automated procedure (Khalighi and Lee 1989) and (2) a user friendly menu driven procedure Huebler t988, Adamczyk andRimai 1988, Marko andRitual 1985). Due to a large number of particles in the flow fields the second algorithm was used extensively for the present study.…”

Section: Mirror Fimentioning

confidence: 99%

Study of the intake tumble motion by flow visualization and particle tracking velocimetry

Khalighi

1991

Experiments in Fluids

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The purpose of this work is to characterize the in-cylinder tumbling flow generated by an engine head during the induction process using flow visualization and particle tracking velocimetry (PTV). The study was carried out for a 4-valve engine head with shrouded intake valves in a special single cylinder transient water analog. This shrouded intake valve configuration was used to obtain a prototypical "pure tumble" flow suitable for fundamental combustion studies. The results revealed that the shrouded intake valves generate a strong, well-behaved tumble vortex on the axial plane between the cylinder head and the piston face. This vortex dominates the entire flow field and seems to be highly repeatable from cycle to cycle. The effect of engine speed on this tumbling flow was studied. An equivalent "tumble ratio" was defined and evaluated using the measured velocity fields at BDC (bottom dead center).

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Section: Mirror Fimentioning

confidence: 99%

Study of the intake tumble motion by flow visualization and particle tracking velocimetry

Khalighi

1991

Experiments in Fluids

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“…The sequence of images obtained by the camera to determine the method of identifying objects on the images to use is analyzed [11][12][13]. It states that Thresholding is the best way to identify the cylinders.…”

Section: Graphic Pathmentioning

confidence: 99%

Software de registro para experimentos bidimensionales realizados en una mesa de suspensión de aire

Hernández¹,

Jiménez²,

Santa³

2016

Vis. Electron.

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El presente trabajo tiene como objetivo documentar la sustitución del costoso papel metálico utilizado por la mesa con el cojín de aire Leybold Didactic GMBH – donde se registra el movimiento y las colisiones de dos partículas en una superficie bidimensional. Tales experimentos emplean dos cilindros que se mueven sobre la mesa con una fricción mínima debido al cojín de aire producido por ellos mismos, lo que les permite moverse casi sin fricción sobre la superficie del vidrio. La investigación descrita condujo al diseño de un software de procesamiento de imágenes en el que se desarrolla un algoritmo para adquirir, procesar y registrar la trayectoria de dos cilindros que se mueven sobre la mesa con un mínimo de fricción. Para llevar a cabo esto se realiza un estudio de los experimentos hechos sobre la mesa y mostrados en el papel metalizado de registro. Basándose en los resultados, esta herramienta digital está diseñada para reemplazar el papel y permite a la comunidad académica utilizar esta tabla de manera sostenible y sin depender de insumos costosos. Adicionalmente, se analizó el error obtenido debido al paso de imágenes a través del algoritmo, resultando sólo un 3% del error total con respecto al obtenido usando el papel real.

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“…Because the direction of ow is determined by the scanning order of the two-colour beam, the ow velocity is calculated by the cross-correlation value of the blue and green beams. The cross-correlation values were obtained by equation ( 3), which uses the Weiner-Khinchin theorem [7] and the calculated Fourier transformation 2 times…”

Section: Two-colour Piv Algorithmmentioning

confidence: 99%

Effects of tumble and swirl flows on turbulence scale near top dead centre in a four-valve spark ignition engine

Lee

2003

Proceedings of the Institution of Mechanical Engineers, Part D:

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The in-cylinder ow eld and the turbulence scale at the ignition timing play an important role in enhancing the propagation speed of the initial ame and the engine combustion. The aim of this work is to investigate the e ect of tumble and swirl ows on the turbulence scale near the top dead centre in a four-valve spark ignition (SI ) engine by an experimental method. In this study, various ow elds such as tumble and swirl ows were generated by intake ow control valves. For investigation of the ow elds, the single-frame particle tracking velocimeter (PTV ) and the twocolour particle image velocimeter (PIV ) techniques were developed to clarify the in-cylinder ow pattern during the intake stroke and the turbulence intensity near the spark plug during the compression stroke respectively. In addition, the ame propagation was visualized by an ICCD camera, and its images were analysed to compare the ow elds. From these experimental results, the e ects of tumble and swirl ows on the turbulence scale and the ame propagation speed were clari ed.

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Particle tracking velocimetry: an automatic image processing algorithm

Cited by 42 publications

References 3 publications

Study of the intake tumble motion by flow visualization and particle tracking velocimetry

Study of the intake tumble motion by flow visualization and particle tracking velocimetry

Software de registro para experimentos bidimensionales realizados en una mesa de suspensión de aire

Effects of tumble and swirl flows on turbulence scale near top dead centre in a four-valve spark ignition engine

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