Experimental Investigation of the In-Cylinder Tumble Motion inside GDI
                        Cylinder at Different Planes under Steady-State Condition using
                        Stereoscopic-PIV

El-Adawy, Mohammed; Heikal, Morgan; Aziz, Abdul Rashid Abdul

doi:10.29252/jafm.75.253.28885

Cited by 14 publications

(2 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Higher valve lift and pressure difference generally result in higher TKE values, indicating greater energy and more effective fuel-air mixing. TKE is computed from the root mean square (RMS) of velocity vector fields using the following equation [29]:…”

Section: Turbulent Kinetic Energy (Tke)mentioning

confidence: 99%

The Effect of Curve Cylinder Liner on in-Cylinder Tumble Flow Motion Characteristic using CFD Port Flow Simulation

Mohd Izamudin Itam Ahmed,

Masri Baharom,

Abd Rashid Abd Aziz

2023

CFDL

View full text Add to dashboard Cite

One crucial task in determining maximum engine output performance is evaluating its respiration capacity. While the steady state flow bench is a commonly used tool in the automotive industry, computational fluid dynamics (CFD) provides a more detailed and comprehensive analysis of flow characteristics within the cylinder compared to experiments. The objective of this paper is to investigate the impact of curve cylinder liners on flow motion characteristics. Using both experimental and CFD methods, this study examines the effect of curve liners on tumble flow motion at different valve lifts and pressure differences. Scalar maps were analysed to understand the behaviour of flow, and the findings indicate that the air velocity measured at the intake port was consistent between both methods, permitting further CFD analysis. Results show that air velocity measured at the intake port was consistent between both methods, allowing for further CFD analysis. Differences in average velocities between liners were insignificant at lower valve lifts, but noticeable at higher valve lifts, with up to a 15.67% difference recorded when the curve wall assisted air flow, resulting in an increase in air rotational strength. In addition, curve liners produced 11.44% and 10.09% more turbulent kinetic energy (TKE) than straight liners for 150mmH2O and 600mmH2O, respectively, with Plane 2 exhibiting the most significant difference in average TKE. Finally, the tumble ratio produced within the curve cylinder was significantly higher than the slider cylinder liner, with differences of up to 17.03% and 11.04% found at higher valve lift (5.4mm) for 150mmH2O and 600mmH2O, respectively.

show abstract

Section: Turbulent Kinetic Energy (Tke)mentioning

confidence: 99%

The Effect of Curve Cylinder Liner on in-Cylinder Tumble Flow Motion Characteristic using CFD Port Flow Simulation

Mohd Izamudin Itam Ahmed,

Masri Baharom,

Abd Rashid Abd Aziz

2023

CFDL

View full text Add to dashboard Cite

show abstract

“…Experimental studies on in-cylinder flow in combustion engines often focus on one or two specific planes, such as the symmetry plane, tumble plane, parallel planes, cross-tumble plane (orthogonal to the symmetry plane), or horizontal planes [7,54,[58][59][60][61]. While there are various optically accessible engine test rigs that enable the application of different optical techniques, occasionally, there is a need for ad-hoc test rigs to replicate specific air flows or to provide better accessibility [19,[33][34][35]40,[62][63][64][65][66][67]. However, a drawback of such engine test benches is frequently lower flexibility regarding the operating parameters, such as the intake pressure and temperature, as well as the limitation to stationary flows with constant valve lifts.…”

Section: Introduction 1motivationmentioning

confidence: 99%

Investigation of Flow Fields Emanating from Two Parallel Inlet Valves Using LES, PIV, and POD

Hoffmann,

Vera-Tudela,

Mirsch

et al. 2023

Energies

View full text Add to dashboard Cite

Understanding cycle-to-cycle variations (CCV) is of practical importance for the combustion of fossil and renewable fuels, as increasingly stringent emission regulations require reductions in the negative effects of such variations. The subject of this study is the flow around inlet valves, since oscillations of such inlet flows affect the flow structure in the cylinder and are thus one of the causes of CCV. To this end, a parametric analysis of the influences of the mass flow rate and valve lift of two parallel engine intake valves on the flow structures is performed. This follows on from an earlier similar study where the flow around a single intake valve was investigated. To analyse the flow behaviour and, in particular, the interactions of the flow leaving these two valves, an optical test rig for 2D particle image velocimetry (PIV) and a large eddy simulation (LES) are used. Proper orthogonal decomposition (POD), together with a quadruple decomposition and the Reynolds stress transport equations, are used to study the turbulence phenomena. The PIV and LES results are in good agreement with each other. The detailed LES analysis of the flow structures shows that, for small valve lifts, the flow separates along the whole perimeter of the intake valve, and for larger valve lifts, the flow escapes only to one side. This is, for combustion engines with the tumble concept, the stage at which the tumble movement develops. Moreover, the flow structures are strongly influenced by the valve lift, while they are unaffected by the variation in the mass flow. The turbulent kinetic energy in the flow field increases quadratically with a decreasing valve lift and increasing mass flow. The large, high-energetic flow structures are particularly dominant near the jet, and the small, low-energetic structures are homogeneously distributed within the flow field. The specific Reynolds stress transport equation shows the limitations of two-dimensionality and large timesteps in the PIV results and the limitations of the LES model.

show abstract

Investigation of the Effect of Engine Cylinder Fin Shape on Heat Transfer Characteristics Under Forced Convection

Agarwal

Letsatsi

2023

Lecture Notes in Mechanical Engineering

View full text Add to dashboard Cite

Experimental Investigation of the In-Cylinder Tumble Motion inside GDI Cylinder at Different Planes under Steady-State Condition using Stereoscopic-PIV

Cited by 14 publications

References 30 publications

The Effect of Curve Cylinder Liner on in-Cylinder Tumble Flow Motion Characteristic using CFD Port Flow Simulation

The Effect of Curve Cylinder Liner on in-Cylinder Tumble Flow Motion Characteristic using CFD Port Flow Simulation

Investigation of Flow Fields Emanating from Two Parallel Inlet Valves Using LES, PIV, and POD

Investigation of the Effect of Engine Cylinder Fin Shape on Heat Transfer Characteristics Under Forced Convection

Contact Info

Product

Resources

About