Measurement of Velocity and Turbulence Scale Near the Spark Plug by Using a Two-Color PIV Method.

Lee, Kihyung; Lee, Chang-Sik; Joo, Youngcheol

doi:10.1299/jsmeb.42.674

Cited by 4 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The concept was first proposed by Adrian (1986) and first implemented by Goss et al (1989Goss et al ( , 1991. Since then there have been a number of applications, either through two-color pulsed lasers (Gogineni et al 1998;Bitting et al 2001) or twocolor CW laser beam sweeping techniques Lee et al (1999). Multicolor schemes have also been used to facilitate the measurement of the three-dimensional three-components (3D3C) flow field (Pick and Lehmann 2009).…”

Section: Specifications and Configurationmentioning

confidence: 99%

“…Previous work with two-color beam scanning technique has addressed the timing issue due to moving particles (Post et al 1994;Lee et al 1999), but the effects of mirror response time and refraction have not been discussed. Although the effect of refraction can be resolved in principle with the known geometrical configuration, we have adopted a more practical solution which only requires a simple calibration procedure.…”

Section: Non-uniform Distribution Of Dtmentioning

confidence: 99%

See 1 more Smart Citation

A dual-beam dual-camera method for a battery-powered underwater miniature PIV (UWMPIV) system

et al. 2012

View full text Add to dashboard Cite

A battery-powered in situ Underwater Miniature PIV (UWMPIV) has been developed and deployed for field studies. Instead of generating high-energy laser pulses as in a conventional PIV system, the UWMPIV employs a low-power Continuous Wave (CW) laser (class IIIb) and an oscillating mirror (galvanometer) to generate laser sheets. In a previous version of the UWMPIV, the time between exposures of a pair of particle images, Dt, could not be reduced without loss of illumination strength. This limitation makes it unsuitable for high-speed flows. In this paper, we present a technique to solve this problem by adopting two CW lasers with different wavelength and two CCD cameras in a second-generation UWMPIV system. Several issues including optical alignment, non-uniform distribution of Dt due to the varying speed of the scanning beam and local flow velocities are discussed. The timing issue is solved through a simple calibration procedure that involves the reconstruction of maps of laser beam arrival time. Comparison of the performance between the new method and a conventional PIV system is presented. Measurements were performed in a laboratory open-channel flume. Excellent agreement was found between the new method and the standard PIV measurement in terms of the extracted vertical profiles of mean velocity, RMS fluctuation, Reynolds stress and dissipation rate of turbulent kinetic energy.

show abstract

Section: Specifications and Configurationmentioning

confidence: 99%

Section: Non-uniform Distribution Of Dtmentioning

confidence: 99%

A dual-beam dual-camera method for a battery-powered underwater miniature PIV (UWMPIV) system

et al. 2012

View full text Add to dashboard Cite

show abstract

“…From this comparison, the two-colour PIV method used in the present study provides reliable results with an uncertainty range of 3 per cent at a ow velocity of 5 m/s. The results of a detailed comparison were given in previous work [9].…”

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:

View full text Add to dashboard Cite

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.

show abstract

Investigation of in-cylinder flow patterns in 4 valve S. I. Engine by using single-frame particle tracking velocimetry

Lee

Chon³

2001

KSME International Journal

Self Cite

View full text Add to dashboard Cite

The in-cylinder flow field of gasoline engine comprises unsteady compressible turbulent flows caused by the intake port, combustion chamber geometry. Thus, the quantitative analysis of the in-cylinder flow characteristics plays an important role in the improvement of engine performances and the reduction of exhaust emission. In order to obtain the quantitative analysis of the in-cylinder gas flows for a gasoline engine, the single-frame particle tracking velocimetry was developed, which is designed to measure 2-dimensional gas flow field. In this paper, influences of the swirl and tumble intensifying valves on the in-cylinder flow characteristics under the various intake flow conditions were investigated by using this PTV method. Based on the results of experiment, the generation process of swirl and tumble flow in a cylinder during intake stroke was clarified. Its effect on the tumble ratio at the end of compression stroke was also investigated.

show abstract

Measurement of Velocity and Turbulence Scale Near the Spark Plug by Using a Two-Color PIV Method.

Cited by 4 publications

References 5 publications

A dual-beam dual-camera method for a battery-powered underwater miniature PIV (UWMPIV) system

A dual-beam dual-camera method for a battery-powered underwater miniature PIV (UWMPIV) system

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

Investigation of in-cylinder flow patterns in 4 valve S. I. Engine by using single-frame particle tracking velocimetry

Contact Info

Product

Resources

About