Effect of engine parameters on in-cylinder flows in a two-stroke gasoline direct injection engine

Addepalli, Srinivasa Krishna; Mallikarjuna, J M; Kumar, Davinder

doi:10.1016/j.apenergy.2016.05.067

Cited by 53 publications

(21 citation statements)

References 49 publications

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“…The tumble ratio (TR) was calculated at different valve lifts from the averaged vorticity obtained from PIV data on the target plane. The mean vorticity was assessed by considering the rotation of the vertical and horizontal velocity components of a particle about the center of the field of view as given Krishna et al (2016):…”

Section: Influence Of the Pressure Difference On Tumble Ratiomentioning

confidence: 99%

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

El-Adawy

Heikal

Aziz

et al. 2018

JAFM

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This paper experimentally investigates the effect of boost pressure on the in-cylinder flow field under steadystate conditions using stereoscopic particle image velocimetry (Stereo-PIV) through increasing the pressure difference across the intake valves. The FEV steady-state flow bench was modified to provide an optical access into the cylinder region. The stereoscopic PIV measurements were carried out at various pressure differences viz., 300, 450, and 600 mmH2O across the intake valves of Gasoline Direct Injection (GDI) head for the mid cylinder vertical tumble-plane. Ensemble average velocity vectors were used to characterize the tumble flow structure and for the calculation of tumble ratio and average turbulent kinetic energy. Moreover, the Proper Orthogonal Decomposition (POD) technique was conducted on the PIV measured velocity vector maps to identify the most energetic structures generated at different valve lifts and pressure differences. The results of stereoscopic PIV measurements showed that the overall in-cylinder flow structures were mainly dependent on the valve lift irrespective of the applied pressure difference. However, the level of the turbulence kinetic energy increased as the boost pressure increased.

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Section: Influence Of the Pressure Difference On Tumble Ratiomentioning

confidence: 99%

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

El-Adawy

Heikal

Aziz

et al. 2018

JAFM

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“…The RNG k-ε turbulence model is used to capture the in-cylinder turbulent flow characteristics [10,11]. The macroscopic fuel spray characteristics are predicted using the KH-RT spray breakup model [12].…”

Section: Cfd Models Consideredmentioning

confidence: 99%

Effect of fuel injector hole diameter and injection timing on the mixture formation in a GDI engine - a CFD study

Jadhav

Mallikarjuna

2017

Int. J. CMEM

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Performance and emission characteristics of a gasoline direct injection (GDI) engine are mainly influenced by the in-cylinder mixture preparation. However, in these engines, mixture formation depends upon many factors viz., fuel injection strategy and parameters, mode of operation, engine geometry, etc. Therefore, understanding the mixture formation, under various engine operating conditions and fuel system configurations, is very much essential. In this study, an attempt has been made to understand the effect of fuel injector-hole diameter and fuel injection timing on the mixture formation in a four-stroke, wall-guided GDI engine using computational fluid dynamics (CFD) analysis. The CFD simulations are carried out from inlet valve opening (IVO) to exhaust valve opening (EVO) period using the CONVERGE. The CFD models used are validated with the available data from the literature. The engine considered has a compression ratio (CR) of 11.5. All the CFD simulations are carried out at the engine speed of 2000 rev/min. Three fuel injector-hole diameters viz., 0.1, 0.14 and 0.18 mm and three fuel injection timings viz., 605, 620 and 635 crank angle degree (CAD) are considered for the analysis. The mixture formation is analyzed in the vicinity of the spark plug and at other parts of the combustion chamber. From the results, it is found that higher nozzle-hole diameter yielded very rich mixture zones near spark plug. Also, lower nozzle-hole diameter and retarded fuel injection timing showed higher indicated mean effective pressure (IMEP).

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“…Krishna et al researched the in-cylinder flow field analysis in a two-stroke engine under motoring conditions by particle image velocimetry. The engine parameters include engine speed, compression ratio, port area ratio and booster port orientation and the flow parameters [14]. Carlucci et al compared the results of 3D simulations with those of 0D and 1D models by the two-stroke two banks uniflow engine model capability by describing the effect of several parameters on engine performance.…”

Section: Introductionmentioning

confidence: 99%

Simulation Modeling and Optimization of Uniflow Scavenging System Parameters on Opposed-Piston Two-Stroke Engines

Zhang

Tie-xiong

2018

Energies

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Based on the introduction of opposed-piston two-stroke (OP2S) gasoline direct injection (GDI) engines, the OP2S-GDI engine working principle and scavenging process were analyzed. GT-Power software was employed to model the working process based on the structural style and principle of OP2S-GDI engine. The tracer gas method and OP2S-GDI engine experiment were employed for model validation at full load of 6000 rpm. The OP2S-GDI engine scavenging system parameters were optimized, including intake port height stroke ratio, intake port circumference ratio, exhaust port height stroke ratio, exhaust port circumference ratio, and opposed-piston motion phase difference. At the same time, the effect of the port height stroke ratio and opposed-piston motion phase difference on effective compression ratio and expansion ratio were considered, and the indicated work was employed as the optimization objective. A three-level orthogonal experiment was applied in the calculation process to reduce the calculation work. The influence and correlation coefficient on the scavenging efficiency and delivery ratio were investigated by the orthogonal experiment analysis of intake and exhaust port height stroke ratio and circular utilization. The effect of the scavenging system parameters on delivery ratio, scavenging efficiency and indicated work were calculated to obtain the best parameters. The results show that intake port height stroke ratio is the main factor for the delivery ratio, while exhaust port height stroke ratio is the main factor to engine delivery ratio and scavenging efficiency.

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Effect of engine parameters on in-cylinder flows in a two-stroke gasoline direct injection engine

Cited by 53 publications

References 49 publications

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

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

Effect of fuel injector hole diameter and injection timing on the mixture formation in a GDI engine - a CFD study

Simulation Modeling and Optimization of Uniflow Scavenging System Parameters on Opposed-Piston Two-Stroke Engines

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