Effect of Boost Pressure on the In-Cylinder Tumble-Motion of GDI Engine
                        under Steady-State Conditions using Stereoscopic-PIV

El-Adawy, Mohammed; Heikal, Morgan; Aziz, Abdul Rashid Abdul; Munir, Sadaf; Siddiqui, M. I.

doi:10.29252/jafm.11.03.28506

Cited by 14 publications

(6 citation statements)

References 27 publications

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“…Even though the input snapshots were collected from different cases of pressure differences, mode 1 only was able to extract more than 85% of total energy, this quantify the degree of similarity between these datasets. This is consistent with the work of both Krishna [31] and El-Adawy [28]. They illustrated that that the effect of engine speed and subsequently the effect of the pressure difference on the flow structure was negligible compared to the effect of valve lift.…”

Section: Evaluation Of the Effect Of Pressure Difference Using Phase-supporting

confidence: 92%

“…The acquired velocity vector fields were used as input datasets to perform the POD analysis. Mainly the experimental set-up of the stereo PIV consists of the following elements, pulsed laser system, two CCD-cameras, two stereo (Scheimpflug) camera mounts, calibration targets and analysis software [27,28]. With PIV, the velocity of particles suspended in the flow of interest is measured-i.e., seeding particles are used as "velocity probes".…”

Section: The Stereoscopic Piv Setupmentioning

confidence: 99%

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On the Application of Proper Orthogonal Decomposition (POD) for In-Cylinder Flow Analysis

et al. 2018

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Proper orthogonal decomposition (POD) is a coherent structure identification technique based on either measured or computed data sets. Recently, POD has been adopted for the analysis of the in-cylinder flows inside internal combustion engines. In this study, stereoscopic particle image velocimetry (Stereo-PIV) measurements were carried out at the central vertical tumble plane inside an engine cylinder to acquire the velocity vector fields for the in-cylinder flow under different experimental conditions. Afterwards, the POD analysis were performed firstly on synthetic velocity vector fields with known characteristics in order to extract some fundamental properties of the POD technique. These data were used to reveal how the physical properties of coherent structures were captured and distributed among the POD modes, in addition to illustrate the difference between subtracting and non-subtracting the ensemble average prior to conducting POD on datasets. Moreover, two case studies for the in-cylinder flow at different valve lifts and different pressure differences across the air intake valves were presented and discussed as the effect of both valve lifts and pressure difference have not been investigated before using phase-invariant POD analysis. The results demonstrated that for repeatable flow pattern, only the first mode was sufficient to reconstruct the physical properties of the flow. Furthermore, POD analysis confirmed the negligible effect of pressure difference and subsequently the effect of engine speed on flow structures.

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Section: Evaluation Of the Effect Of Pressure Difference Using Phase-supporting

confidence: 92%

Section: The Stereoscopic Piv Setupmentioning

confidence: 99%

On the Application of Proper Orthogonal Decomposition (POD) for In-Cylinder Flow Analysis

et al. 2018

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“…The turbulence intensity in the cylinder is related to the turbulent kinetic energy. 32 The turbulence intensity clearly affects the flame propagation speed and mixture formation, and larger TKE can promote flame propagation and effectively mix fuel and air. 33,34 As such, TKE is an important factor regarding in-cylinder flow analysis so, it was considered in this paper.…”

Section: Methodsmentioning

confidence: 99%

Effects of piston crown designs on in-cylinder flow and mixture formation in gasoline direct injection engine under the lean burn condition

Kim

Shin

Kim

et al. 2023

International Journal of Engine Research

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In this study, the effects of piston shapes on in-cylinder flow characteristics and mixture formation in the lean condition was analyzed using the PIV method and CFD (CONVERGE v2.4). The four-piston geometries were concave, flat, convex, and base pistons, and the pistons were mounted on a GDI engine with transparent quartz. To quantify in-cylinder flow characteristics, the mean velocity, tumble ratio, turbulent kinetic energy, and tumble center were calculated. In addition, to analyze the effects of the difference in piston shapes in detail, the velocity fraction was calculated by dividing the cylinder area into three. In-cylinder flow was compared for the case without injection and the case with injection. There were four timed injections at C.A. 420°, 480°, 540°, and 600°, and the mixture characteristics were investigated in the cases of 480° and 600° injection. In the intake process and early compression process, there was no significant difference in the quantitative values for the shape of the piston regardless of the presence or absence of injection. However, the effects of the piston crown designs increased in the later compression process. As a result, the highest turbulent kinetic energy was found using a flat piston with a relatively high tumble ratio and swirl ratio in the absence of injection. The mixture formation was similar for all piston crown designs when injected at the crank angle of 480°. However, when the crank angle of 600° was injected, a stagnant fuel area was formed using the base-type piston, so it was difficult to secure sufficient fuel near the center of the cylinder.

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“…The thickness of blades is 0.6 mm and swirl number is 0.53, which is calculated according to equation by (1) (Beer and Chigier 1972) Two-dimensional PIV, a dominant method for velocimetry in experimental fluid mechanics (Westerweel et al 2013, Arthur 2018, Adawy et al 2018, is applied to measure the velocity field of the swirling jets. The experimental configuration is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Isothermal Flow inside a New Combustor with Two-Stage Axial Swirler

Wang

Wei

Shrotriya

et al. 2022

JAFM

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Experiments and numerical simulations are performed to study the cold flow field characteristics in a two-stage axial swirl combustion chamber. Large eddy simulation with dynamic turbulent kinetic energy sub-grid scale model is used to calculate the flow field, and particle image velocimetry is used to measure the turbulent flow field. The calculated results are found to be in a good agreement with the experiment results. Due to the shear layers and the density difference between CO2 and air flows, the central recirculation zone appears. With the increase of the ratio of flow velocity between inner and outer tubes, the central recirculation zone shrinks gradually, while the length and range of the angular recirculation zone increase continuously. The vortex structure develops in the axial and radial directions, and the vortex breakdown mostly occurs in the upstream regions. However, outside the central recirculation zone, only one shear layer is observed, and its vortex structure is almost extended up to the exit of the combustion chamber. In addition, precession vortex core is not seen in all the conditions.

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Effect of Boost Pressure on the In-Cylinder Tumble-Motion of GDI Engine under Steady-State Conditions using Stereoscopic-PIV

Cited by 14 publications

References 27 publications

On the Application of Proper Orthogonal Decomposition (POD) for In-Cylinder Flow Analysis

On the Application of Proper Orthogonal Decomposition (POD) for In-Cylinder Flow Analysis

Effects of piston crown designs on in-cylinder flow and mixture formation in gasoline direct injection engine under the lean burn condition

Investigation of Isothermal Flow inside a New Combustor with Two-Stage Axial Swirler

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