Convective and Radiative Heat Transfer in a High Swirl Direct Injection Diesel Engine

Dent, J. C.; Sulaiman, Syabillah

doi:10.4271/770407

Cited by 63 publications

(17 citation statements)

References 10 publications

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“…A higher engine speeds leads to a higher in-cylinder gas flow and hence a higher convection coefficient. This is confirmed by [21,20,22]. The peak values are predicted by both simulations since their relative error is smaller than the measurement error on the peak convection coefficient.…”

Section: Effect Of Engine Settingssupporting

confidence: 62%

Evaluation of empirical heat transfer models using TFG heat flux sensors

Cuyper

Broekaert

Chana

et al. 2017

Applied Thermal Engineering

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Section: Effect Of Engine Settingssupporting

confidence: 62%

Evaluation of empirical heat transfer models using TFG heat flux sensors

Cuyper

Broekaert

Chana

et al. 2017

Applied Thermal Engineering

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“…Dent and Sulaiman [7] investigated the applicability of using a forced convective turbulent heat transfer correlation for flow over a flat plate to predict the convective heat flux in a high swirl direct injection diesel engine. In this investigation, the heat transfer correlation was based on the Nusselt number as derived by Kreith [8].…”

Section: Methodsmentioning

confidence: 99%

“…Other correlations for the heat transfer coefficient have been used in the past for direct injection diesel engines, such as Annand [9], Woschni [10], and Le Feuvre et al [11]. The correlation used by Annand [9] is very similar to Dent and Sulaiman [7]. An important difference is Dent and Sulaiman [7] used the swirl velocity as the characteristic velocity and the bore circumference as the characteristic length in the Reynold's number.…”

Section: Methodsmentioning

confidence: 99%

Cylinder Cooling for Improved Durability on an Opposed-Piston Engine

Lee¹,

Wahl²

2012

SAE Technical Paper Series

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The cooling system design for a two-stroke, opposed-piston (OP) engine is substantially different from that of a conventional four-stroke engine as the opposed-piston engine requires efficient cooling at the center of the cylinder where the heat load is highly concentrated. A thermally efficient design ensures engine durability by preserving the oil film at the top ring reversal zone. This is achieved by limiting the surface temperature of the liner to below 270° C at this location. Various water jacket designs have been analyzed with computational fluid dynamics (CFD) using a "discretized" Nusselt number approach for the gas side heat flux prediction. With this method, heat transfer coefficients are computed locally given the flow field of the combustion gases near the liner surface and then multiplied by the local gas/liner temperature difference to generate the heat flux distribution into the cylinder liner. The heat flux is then averaged over the cycle before being applied as a boundary condition to the CFD simulation. The baseline design consists of a simple water jacket with coolant flowing axially from the inlet near the intake port to the outlet near the exhaust port. This approach yields uneven cooling both longitudinally and circumferentially about the cylinder liner. A greatly improved thermal response has been achieved by introducing the coolant at the hot center section of the liner with roughly half of the coolant flowing toward either end of the cylinder. A detailed analysis shows that liner surface temperatures well below 270° C can be achieved for an engine with a power density of 50kW/liter by carefully optimizing the coolant velocities in the center section of the liner.

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“…Hassan [21] (with a coaxial 165 thermocouple) and Dao et al [23] demonstrated that the peak values of the heat flux increased. Dent and Suliaman [22] (with a thin film sensor) showed that the heat flux was only significantly higher around TDC within an interval of 90…”

Section: Influence Of Engine Speedmentioning

confidence: 99%

Heat transfer in premixed spark ignition engines part I: Identification of the factors influencing heat transfer

Broekaert

Demuynck

Cuyper

et al. 2016

Energy

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The heat transfer from the combustion gases to the cylinder walls inside a spark ignition engine is a key factor in an engine's design, due to its influence on the engine's efficiency, power and emissions. Therefore a lot of research has been conducted in order to accurately model the heat transfer, for engine design and optimization purposes. These models have been found to provide inaccurate predictions for fuels which have significantly different gas properties compared to traditional fossil fuels. This indicates that the models either do not properly include gas properties, or are missing some important properties in their formulation. In order to construct a general ("fuel-independent") heat transfer model, new measurements need to be executed, with multiple fuels that have different properties. Designing such an experiment requires a thorough understanding of the factors influencing the heat transfer and their interactions. In this paper a literature review is presented of heat transfer measurements in spark ignition engines in order to investigate the effect of the engine factors on the heat transfer. Based on this review, a root cause analysis is conducted to identify the independent factors that affect heat transfer. These factors are then used to set up two experiments according to a Design of Experiments methodology that allows the investigation of the effect of different gas properties and engine settings on the heat transfer in a consistent way. The results of these measurements for motored operation are discussed in [1] and for fired operation in a companion paper [2].

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Convective and Radiative Heat Transfer in a High Swirl Direct Injection Diesel Engine

Cited by 63 publications

References 10 publications

Evaluation of empirical heat transfer models using TFG heat flux sensors

Evaluation of empirical heat transfer models using TFG heat flux sensors

Cylinder Cooling for Improved Durability on an Opposed-Piston Engine

Heat transfer in premixed spark ignition engines part I: Identification of the factors influencing heat transfer

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