Study of Induction Tumble by Particle Tracking Velocimetry in a 4-Valve Engine

Rönnbäck, Marie; Le, Wang Xiao; Linna, Jan-Roger

doi:10.4271/912376

Cited by 15 publications

(3 citation statements)

References 14 publications

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“…The first in-cylinder flow field experiments using optical laser-based measurement techniques were performed in the early 1980s and 1990s. Rimai et al, 6 Reuss et al 7 and Rönnbäck et al 8 performed investigations in motored engines, and Nino et al 9 conducted a study in a fired engine. In recent years, high-speed PIV applications for engines have been developed (e.g.…”

Section: Introductionmentioning

confidence: 99%

High-speed micro particle image velocimetry studies of boundary-layer flows in a direct-injection engine

Jainski

Dreizler

et al. 2012

International Journal of Engine Research

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Mass and energy exchange processes near the in-cylinder walls have become increasingly important for internal combustion engine research and development. Heat-transfer and fuel-deposition processes are not well enough understood to fully predict their magnitude and temporal and spatial variation. To a large extent, improvements in modeling are limited because of a lack of experimental guidance on the dynamics of boundary-layer flows in engines. High-speed particle image velocimetry and micro particle image velocimetry were used to study the boundary-layer flow field at the cylinder head of a motored internal combustion engine for three different engine speeds (400, 800 and 1100 r/min). Velocity measurements were taken throughout the compression stroke and the beginning of the expansion stroke, and comparisons to the frequently used law-of-the-wall were made. The low-resolution particle image velocimetry images showed that the average bulk flow maintained a tumble flow throughout the compression and expansion strokes and velocities scaled with engine speed. Adequate spatial resolution of the boundary-layer flow required the use of high-resolution (micro particle image velocimetry) measurements which showed that the log-law does not accurately describe the experimental boundary-layer structure in the outer layer ( 30 < y + < 50 ). Using the log-law, the velocity for earlier crank angles (180–260 crank angle degrees) was over predicted while the velocity for later crank angles (300–330 crank angle degrees) was under predicted, as engine speed increased. However, the experimental velocity profiles near the wall ( y + < 4 ) matched the description of the viscous sublayer ( u + = y + ). Furthermore, it was observed that the thickness of the viscous sublayer decreased as the engine speed increased. The viscous sublayer could not be adequately resolved at 1100 r/min because of the limitations in adequate seeding density near the surface and the resulting loss of data points closest to the wall. The capability of high-speed particle image velocimetry measurements is demonstrated by the ability to identify and track vortical structures that move through the outer and buffer layers. Future work must address the evolution of such flow structures, along with measurements of temperature, to enable development and validation of boundary-layer models that are not restricted by the assumptions necessary for the law-of-the-wall such as steady bulk flow conditions and properties.

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Section: Introductionmentioning

confidence: 99%

High-speed micro particle image velocimetry studies of boundary-layer flows in a direct-injection engine

Jainski

Dreizler

et al. 2012

International Journal of Engine Research

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“…There are many experimental techniques that have been applied and are available to detect and either quantify or qualify flow conditions prevailing before the onset of combustion. These include flow visualisation, PIV [3,5], particle tracking velocimetry (PTV) [6] and Laser Doppler Anemometry (LDA) [4]. There also exist many techniques that can detect combustion phenomena such as ionisation probe sensors and Laser Induced Florescence (LIF) [7,9].…”

Section: Introductionmentioning

confidence: 99%

Optical Study of Flow and Combustion in an HCCI Engine with Negative Valve Overlap

Wilson

Richardson

et al. 2006

J. Phys.: Conf. Ser.

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One of the most widely used methods to enable Homogeneous Charge Compression Ignition (HCCI) combustion is using negative valve overlapping to trap a sufficient quantity of hot residual gas. The characteristics of air motion with specially designed valve events having reduced valve lift and durations associated with HCCI engines and their effect on subsequent combustion are not yet fully understood. In addition, the ignition process and combustion development in such engines are very different from those in conventional spark-ignition or diesel compression ignition engines. Very little data has been reported concerning optical diagnostics of the flow and combustion in the engine using negative valve overlapping. This paper presents an experimental investigation into the in-cylinder flow characteristics and combustion development in an optical engine operating in HCCI combustion mode. PIV measurements have been taken under motored engine conditions to provide a quantitative flow characterisation of negative valve overlap in-cylinder flows. The ignition and combustion process was imaged using a high resolution charge coupled device (CCD) camera and the combustion imaging data was supplemented by simultaneously recorded in-cylinder pressure data which assisted the analysis of the images. It is found that the flow characteristics with negative valve overlapping are less stable and more valve event driven than typical spark ignition in-cylinder flows, while the combustion initiation locations are not uniformly distributed.

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“…On the other hand, measuring instantaneous distribution of velocity vectors by particle image velocimetry (PIV) or particle tracking velocimetry (PTV), is effective in understanding spatial characteristics of the flow field. After a noted application of PIV to in-cylinder flow was presented by Reuss et al in 1989 [1], various methodologies of in-cylinder flow measurement by PIV [2][3][4][5][6] and PTV [7][8][9][10] have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Diagnostics of in-cylinder flow, mixing and combustion in gasoline engines

Kuwahara

Ando

2000

Meas. Sci. Technol.

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In a premixed leanburn engine employing an in-cylinder rotating flow, tumble, the influence of the in-cylinder flow field structure on combustion was investigated with a two-dimensional PTV, a three-dimensional PTV and the analysis of continuous and cycle-to-cycle UV flame images. As a result, optimum combustion control was achieved by controlling the generation of turbulence. In a gasoline direct injection engine adopting a wide spacing layout, the characteristics of mixture preparation were investigated by visualizing a fuel spray with laser shadowgraphy and LIF, and deriving the mixture strength at the spark plug from spectrum analysis of spark discharge emission. Also, the combustion characteristics were investigated by analysing flame emission spectra continuously, and imaging UV luminescence and thermal radiation of flame emission simultaneously. Consequently, it was clarified that combustion control is achieved by controlling air-fuel mixing.

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Study of Induction Tumble by Particle Tracking Velocimetry in a 4-Valve Engine

Cited by 15 publications

References 14 publications

High-speed micro particle image velocimetry studies of boundary-layer flows in a direct-injection engine

High-speed micro particle image velocimetry studies of boundary-layer flows in a direct-injection engine

Optical Study of Flow and Combustion in an HCCI Engine with Negative Valve Overlap

Diagnostics of in-cylinder flow, mixing and combustion in gasoline engines

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