&lt;title&gt;Particle image velocimetry system using a high-resolution CCD camera&lt;/title&gt;

Wormell, Dean; Sopchak, James

doi:10.1117/12.163747

Cited by 7 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Directional ambiguity is inherent in simple twin-exposure PIV recording but may be eliminated by various means including image shifting, image separation [39] and image labelling [40,41]. Various image shifting techniques have been shown to be beneficial in many applications [42][43][44][45], and these may be adapted for cross-correlation analysis [46]. Cross-correlation interrogation has a number of significant advantages over autocorrelation.…”

Section: Further Improvements To Pivmentioning

confidence: 99%

See 1 more Smart Citation

Barrel swirl breakdown in spark-ignition engines: Insights from particle image velocimetry measurements

Reeves¹,

Haste

Garner

et al. 1999

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

Particle image velocimetry (PIV) has been used here to study the formation and breakdown of barrel swirl (‘tumble’) in a production geometry, four-stroke, four-valve, motored, spark-ignition, optically accessed internal combustion (IC) engine. The barrel swirl ratio (BSR) of the cylinder head could be enhanced by means of a port face inducer gasket so that the flow processes taking place at low and high swirl ratios could be investigated conveniently. Double-exposed images from planes both parallel and perpendicular to the cylinder axis were recorded at selected crank angles through the induction and compression strokes at a motored engine speed of 1000 r/min, with a wide open throttle, for both high and low BSR cases. The recorded images were interrogated by digital autocorrelation to give two-dimensional maps of instantaneous velocity. In both high and low BSR cases, a barrel or tumbling vortex motion is generated during induction, which is shown to persist throughout the majority of the compression stroke. The details of barrel swirl formation during induction and its subsequent modification during compression, however, differ strongly between the two cases. These differences can be explained qualitatively in terms of two main events; the first being competition during induction between vortices of unequal strength and the second being competition between the large-scale swirl motion and the local flow field generated by piston motion during compression. In the low barrel swirl case, significant dissipation occurs owing to these interactions and consequently the large-scale motion exhibits lower mean velocities and undergoes significant distortion. In the case of high BSR, the competition effects are minimized and a single ordered vertical vortex exhibiting high velocity magnitudes is observed to avoid piston induced distortion. It then moves into the apex of the pent roof combustion chamber where it survives as a single ordered vortex until at least 40° crank angle (CA) before top dead centre (TDC). Limitations and developments of the PIV technique are discussed.

show abstract

Section: Further Improvements To Pivmentioning

confidence: 99%

“…Various image shifting techniques have been shown to be beneficial in many applications [42][43][44][45], and these may be adapted for cross-correlation analysis [46]. Cross-correlation interrogation has a number of significant advantages over autocorrelation.…”

Section: Further Improvements To Pivmentioning

confidence: 99%

Barrel swirl breakdown in spark-ignition engines: Insights from particle image velocimetry measurements

Reeves¹,

Haste

Garner

et al. 1999

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…In unsteady fl ows with complex geometry where access may be diffi cult, PIV can be a useful tool. Time averaged velocity and turbulence values at each point in the fl ow fi eld can also be obtained with PIV when a sequence of frames is analyzed (Haidn, 1998;Wormell, 1996). Flow visualization and its analysis are highly desired for gas and particle fl ow in the FBC systems.…”

mentioning

confidence: 99%

The Bed Expansion and Particle Velocity Analysis in the Swirling Fluidized Bed Combustor (SFBC) Cold Model

Lee

Liu

2004

Can J Chem Eng

View full text Add to dashboard Cite

Flow visualization and analysis was extensively conducted in a bench‐scale swirling fluidized bed combustor (SFBC) cold model. An advanced laser‐based particle image velocimetry (PIV) system was used to visualize the gas‐particle flow in SFBC cold model. The robust experiment design method was applied to study the bed expansion in the SFBC cold model in relationship with secondary airflow ratio. It was found that the secondary airflow ratio did not affect the bed expansion in the SFBC cold model. Based on the PIV velocity profiles analysis, it was observed that particle velocities increased when secondary airflow ratio is increased. The secondary air was definitely generating the high tangential particle velocity.

show abstract

Particle image velocimetry analysis of IC engine in-cylinder flows

Reeves

Garner

Dent

et al. 1996

Optics and Lasers in Engineering

View full text Add to dashboard Cite

<title>Particle image velocimetry system using a high-resolution CCD camera</title>

Cited by 7 publications

References 0 publications

Barrel swirl breakdown in spark-ignition engines: Insights from particle image velocimetry measurements

Barrel swirl breakdown in spark-ignition engines: Insights from particle image velocimetry measurements

The Bed Expansion and Particle Velocity Analysis in the Swirling Fluidized Bed Combustor (SFBC) Cold Model

Particle image velocimetry analysis of IC engine in-cylinder flows

Contact Info

Product

Resources

About