Numerical investigation of boundary layer flow and wall heat transfer in a gasoline direct-injection engine

Fan, Xueqi; Che, Zhizhao; Wang, Tianyou; Lu, Zhen

doi:10.1016/j.ijheatmasstransfer.2017.09.089

Cited by 18 publications

(12 citation statements)

References 37 publications

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“…There are also some one dimensional and multidimensional models described. It was an important review at the time, and still nowadays it is used in the literature [15,[27][28][29][30][31].…”

Section: Ice Heat Transfer and Wall Temperature Modelingmentioning

confidence: 99%

“…Fan et al [27] performed CFD-3D simulations of a spark ignition engine under motoring conditions, using detached eddy simulation for turbulence modelling. The authors used PIV measurements on the center of the combustion chamber of an optical direct injection spark ignition, in order to validate the results of the CFD-3D model.…”

Section: Wall Functionsmentioning

confidence: 99%

“…3, makes nodal models more complete than global ones. Along with it, the use of the lumped capacitance assumption makes nodal models more versatile than multidimensional ones, once the computational cost is (27)…”

Section: Nodal Models For Wall To Wall Engine Heat Transfermentioning

confidence: 99%

“…Bohac et al [8] calculated a heat transfer coefficient h between coolant gallery walls and coolant, by a sum of a convective heat trasnfer coefficient h conv using Grimson's Nusselt correlation for flow past a bank of cylinders, and a nucleate boiling heat transfer coefficient h nuc.boiling inside cooling galleries in contact with hot surfaces proposed by Chen [56]. Torregrosa et al [44] developed correlations for thermal conductance between cylinder liner and water (27), and also for cylinder head and water (28), using thermal resistance theory. For the cylinder liner, the authors considered a series thermal circuit between conduction through cylinder liner wall and convection from cylinder to coolant, in such a manner the convective coefficient has been obtained experimentally.…”

Section: Wall To Coolant Heat Transfermentioning

confidence: 99%

See 3 more Smart Citations

Internal Combustion Engine Heat Transfer and Wall Temperature Modeling: An Overview

Fonseca

Olmeda

Novella

et al. 2019

Arch Computat Methods Eng

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Internal combustion engines are now extremely optimized, in such ways improving their performance is a costly task. Traditional engine improvement by experimental means is aided by engine thermodynamic models, reducing experimental and total project costs. For those models, accuracy is mandatory in order to offer good prediction of engine performance. Modelling of the heat transfer and wall temperature is an important task concerning the accuracy and the predictions of any engine thermodynamic model, although it is many times an overcome task. In order to perform good prediction of engine heat transfer and wall temperature, models are required for accomplish heat transfer from hot gases to engine parts, heat transfer inside each engine part, and also heat transfer to coolant and lubricating oil. This paper presents an overview about engine heat transfer and wall temperature modelling, with main purpose to aid engine thermodynamic modelling and offer more accurate predictions of engine performance, consumption and emission parameters. The most important correlation are reviewed for three engine heat transfer approaches: gas to wall, wall to wall and wall to liquid heat transfer models. In order to obtain good prediction of wall temperature, those three approaches must be coupled, which may imply convection-conduction-convection problems, although for some applications in diesel engines, radiation problems must be considered.

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Section: Ice Heat Transfer and Wall Temperature Modelingmentioning

confidence: 99%

Section: Wall Functionsmentioning

confidence: 99%

Section: Nodal Models For Wall To Wall Engine Heat Transfermentioning

confidence: 99%

Section: Wall To Coolant Heat Transfermentioning

confidence: 99%

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Internal Combustion Engine Heat Transfer and Wall Temperature Modeling: An Overview

Fonseca

Olmeda

Novella

et al. 2019

Arch Computat Methods Eng

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show abstract

“…Previous studies have revealed substantial deviations between the natural boundary layer in IC engines and the wall function universally used in the near-wall treatment in in-cylinder flow simulations. [5][6][7][8] Accordingly, an in-depth experimental investigation of the boundary layer flow is indispensable for optimizing modern IC engines and developing simulation models with reliable experimental data.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of boundary layer flow near the cylinder wall in a direct-injection spark-ignition engine using particle image velocimetry

Tian

Wang

Che

et al. 2022

International Journal of Engine Research

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In a direct-injection spark-ignition (DISI) optical engine with a constant motored speed of 800 rpm, particle image velocimetry measurements on the in-cylinder bulk flow and the boundary layer flow near the cylinder wall were performed during the intake and compression strokes. Two different tumble flow levels were explored using a flap inserted in the intake port. The near-wall flow pattern under the effect of the bulk flow is more stable when the flap is fully closed with a higher intensity tumble. The serious optical distortion in the near-cylinder wall region under high magnification was addressed, and a high resolution of 76 μm × 76 μm within a field of view of 5 mm × 5 mm was achieved in six different measurement regions. Using inner scaling parameters (friction velocity uτ and viscous length-scale δυ), the dimensionless ensemble-averaged wall-tangential velocity profiles exhibit good consistency with the law-of-the-wall in the viscous sublayer but considerably departure in the logarithmic region. According to the low friction Reynolds number, the absence of the logarithmic layer was mainly attributed to the complete overlap between the viscosity-affected inner region and the outer region of the boundary layer. The near-wall velocity profiles were also normalized by three different outer scaling parameters. The collapse is significantly improved for y/ δ >0.07 when the velocity profiles are normalized by δ/ δ*(1− u/ u∞). The fluctuation RMS velocity in the wall-normal direction is greater, particularly for the high tumble flow level condition.

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Multi-cycle Direct Numerical Simulations of a Laboratory Scale Engine: Evolution of Boundary Layers and Wall Heat Flux

Danciu,

Giannakopoulos,

Bode

et al. 2024

Flow Turbulence Combust

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Multi-cycle direct numerical simulations (DNS) of a laboratory-scale engine at technically relevant engine speeds (1500 and 2500 rpm) are performed to investigate the transient velocity and thermal boundary layers (BL) as well as the wall heat flux during the compression stroke under motored operation. The time-varying wall-bounded flow is characterized by a large-scale tumble vortex, which generates vortical structures as the flow rolls off the cylinder wall. The bulk flow is found to strongly affect the development of the BL profiles, especially at higher engine speeds. As a result, the large-scale flow structures lead to alternating pressure gradients near the wall, invalidating the flow equilibrium assumptions used in typical wall modeling approaches. The thickness of the velocity BL and of the viscous sublayer was found to scale inversely with engine speed and crank angle. The thermal BL thickness also scales inversely with engine speed but increases with in-cylinder temperature. In contrast, thermal displacement thickness, which is sometimes used as a proxy for thermal BL thickness, was found to decrease with increasing temperature in the bulk. Examination of the heat flux distribution revealed areas of increased heat flux, particularly at places characterized by strong flow directed towards the wall. In addition, significant cyclic variations in the surface-averaged wall heat flux were observed for both engine speeds. An analysis of the cyclic tumble ratio revealed that the cycles with lower tumble ratio values near top dead center (TDC), indicative of an earlier tumble breakdown, also exhibit higher surface averaged wall heat fluxes. These findings extend previous numerical and experimental results for the evolution of BL structure during the compression stroke and serve as an important step for future engine simulations under realistic operating conditions.

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Numerical investigation of boundary layer flow and wall heat transfer in a gasoline direct-injection engine

Cited by 18 publications

References 37 publications

Internal Combustion Engine Heat Transfer and Wall Temperature Modeling: An Overview

Internal Combustion Engine Heat Transfer and Wall Temperature Modeling: An Overview

Experimental investigation of boundary layer flow near the cylinder wall in a direct-injection spark-ignition engine using particle image velocimetry

Multi-cycle Direct Numerical Simulations of a Laboratory Scale Engine: Evolution of Boundary Layers and Wall Heat Flux

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