Time Resolved Investigation of Unsteady Flow Inside Inlet Manifolds and Characterization of Inlet Flow Behavior

Gindele, Jörg; Kech, Johannes; Spicher, Ulrich

doi:10.4271/972828

Cited by 8 publications

(6 citation statements)

References 6 publications

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“…In practice, it has been shown that the two methods have similar precision, smaller than 2% of the measured quantity [18]. For endoscopic PIV, Gindele and Spicher have shown that, even with strong barrel distortion, both methods yield the same precision (smaller than 3% in their experiment) [13]. In the present case, it is shown below that no single magnification function has been found to correct the distortion of the particle images.…”

Section: Specific Image Processingmentioning

confidence: 48%

“…Methods of image processing for the correction of geometric aberrations are based on the acquisition of a calibration image consisting of a grid of regular patterns or lines, as presented in figure 3. Common unwarping correction methods of barrel distortion use polynomial functions [13,19,20]. Coefficients of the polynomial functions (usually at the third order) are determined from a set of reference points selected on the calibration image.…”

Section: Specific Image Processingmentioning

confidence: 99%

“…Recent developments of image processing have shown the feasibility of the determination of temperature in combustion furnaces thanks to air-cooled endoscopes [7][8][9][10]. For PIV measurements, an endoscope has also been used in different configurations for which limited optical access was the main issue: pipeline with bends or flow conditioners [11,12], internal combustion engines [13][14][15], rotor-stator system [16] or low pressure turbine rig [17]. Another difficulty that can be encountered is the strong image distortion, which then has to be taken into account during image processing.…”

Section: Introductionmentioning

confidence: 99%

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An endoscopic particle image velocimetry system for high-temperature furnaces

Rottier

Godard

Corbin

et al. 2010

Meas. Sci. Technol.

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This paper presents the development of an endoscopic particle image velocimetry (PIV) system adapted to high-temperature furnaces. The optical setup is designed to be able to image large fields of measurements with a collection angle of 62 • . This optical setup acts as a camera lens in front of the CCD camera and is set in a water-cooled jacket for its thermal protection. A strong barrel distortion is obtained when imaging a large field of view. This geometric distortion is corrected on raw particle images by specific image processing before the cross-correlation calculation. A first application of this endoscopic PIV system in a laboratory-scale furnace is presented. This shows its ability to obtain large velocity fields even in such a high-temperature confined configuration.

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Section: Specific Image Processingmentioning

confidence: 48%

Section: Specific Image Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An endoscopic particle image velocimetry system for high-temperature furnaces

Rottier

Godard

Corbin

et al. 2010

Meas. Sci. Technol.

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“…Further, it has been reported that changes to intake port geometries have a marked effect on the flow field structures appearing within the cylinder [6][7][8]. These important flow influences often referred to as tumble are particularly apparent before bottom dead centre (BDC).…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that the in-cylinder fluid dynamics in DI diesel engines have an important effect on the in-cylinder fuel distribution, combustion and pollutant emission formation [1][2][3][4][5]. Further, it has been reported that changes to intake port geometries have a marked effect on the flow field structures appearing within the cylinder [6][7][8]. These important flow influences often referred to as tumble are particularly apparent before bottom dead centre (BDC).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the grid and intake-generated tumble on the in-cylinder flow in a compression ignition direct-injection engine

Micklow

Gong

2008

Proceedings of the Institution of Mechanical Engineers, Part D:

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The in-cylinder flow field was numerically investigated for a four-valve per cylinder Caterpillar diesel CAT3401 engine. The computer program used was the KIVA3V code developed by Los Alamos National Laboratory. To assess the effect of modelling assumptions made during the domain discretization, three grid models were developed. The first grid or the 'complete' grid was a full 360u mesh with moving valves, intake ports, exhaust ports, and runners. The second grid was a full 360u mesh without moving valves, intake ports, or exhaust ports. The third grid assumed that the in-cylinder flow field was periodic and a 60u mesh was generated to accommodate one of the six centrally located fuel injectors. It also neglected the valves and the intake and exhaust ports. The simplification of the grids is to reduce the massive computational and memory requirements to model these flows.For the complete grid, the computation was initiated when the piston was at the top dead centre location on the intake stroke. For the second and third grids, the computation was initiated after the intake valve had closed. Complex three-dimensional vortical flow structures or tumble is developed during the intake stroke. These structures were clearly shown when the complete grid was used. By comparing the solution of the complete grid with the solutions of the second and third grids, it was seen that important in-cylinder flow information is lost. To overcome this deficiency, a new parameter, namely the initial tumble ratio, was embedded into the standard KIVA3V code by the present authors. When the simplified second grid is used in conjunction with the initial tumble ratio option, an in-cylinder flow pattern similar to that which was computed with the complete grid was obtained. This indicates that the new option significantly improves the accuracy of in-cylinder flow prediction when the moving valves and intake or exhaust ports are not modelled.The effects of the values of the initial turbulence kinetic energy (TKE i ) and the initial turbulence length scale (SCL i ) were also studied. It is found that the suggested value of TKE i used in KIVA3V is too small to predict the actual turbulence kinetic energy in the cylinder when the second and third grids are used. Therefore, a larger value for TKE i is recommended. The effects of the different grids, the new initial tumble ratio, and the different values of SCL i and TKE i on important flow parameters, such as the swirl ratio, the tumble ratio, and the turbulence kinetic energy are compared in detail in this article.

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Flow mapping of multiphase flows using a novel single stem endoscopic particle image velocimetry instrument

Lad¹,

Aroussi²,

Adebayo³

2011

Meas. Sci. Technol.

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Particle image velocimetry (PIV) is a successful flow mapping technique which can optically quantify large portions of a flow regime. This enables the method to be completely non-intrusive. The ability to be non-intrusive to any flow has allowed PIV to be used in a large range of industrial sectors for many applications. However, a fundamental disadvantage of the conventional PIV technique is that it cannot easily be used with flows which have no or limited optical access. Flows which have limited optical access for PIV measurement have been addressed using endoscopic PIV techniques. This system uses two separate probes which relay a light sheet and imaging optics to a planar position within the desired flow regime. This system is effective in medical and engineering applications. The present study has been involved in the development of a new endoscopic PIV system which integrates the illumination and imaging optics into one rigid probe. This paper focuses on the validation of the images taken from the novel single stem endoscopic PIV system. The probe is used within atomized spray flow and is compared with conventional PIV measurement and also pitot-static data. The endoscopic PIV system provides images which create localized velocity maps that are comparable with the global measurement of the conventional PIV system. The velocity information for both systems clearly show similar results for the spray characterization and are also validated using the pitot-static data.

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Time Resolved Investigation of Unsteady Flow Inside Inlet Manifolds and Characterization of Inlet Flow Behavior

Cited by 8 publications

References 6 publications

An endoscopic particle image velocimetry system for high-temperature furnaces

An endoscopic particle image velocimetry system for high-temperature furnaces

Investigation of the grid and intake-generated tumble on the in-cylinder flow in a compression ignition direct-injection engine

Flow mapping of multiphase flows using a novel single stem endoscopic particle image velocimetry instrument

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