Methods for heat transfer and temperature field analysis of the insulated diesel: Phase 3, Final report

Morel, Thomas; Kerlbar, R.; Fort, Edward F.; Blumberg, Paul N.

doi:10.2172/6302540

Cited by 6 publications

(9 citation statements)

References 2 publications

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“…The gas zones have a thickness equal to 10% the bowl diameter. This value is high enough to be larger than the boundary layer thickness [19] but low enough to avoid including areas far from the surface where velocity evolves distinctly. Circumferential symmetry was assumed for the surfaces and the gas volumes.…”

Section: Tangential Velocity On the Piv Planementioning

confidence: 99%

“…The resulting temperatures are summarized in table 5. Gas-wall heat transfer coefficient h was calculated with correlation 10, due to Colburn [45] and used by Morel [19].…”

Section: Heat Transfer Calculationmentioning

confidence: 99%

“…Convective heat transfer depends on in-cylinder gas motion, hence the need to understand the flow structures in the combustion chamber in order to investigate heat losses. Morel [19] wrote a comprehensive report about the relation between gas motion and heat rejection which became a sound reference for researchers. In-cylinder swirl motion has received special attention from researchers because of its clear influence on increasing heat transfer [20].…”

Section: Introductionmentioning

confidence: 99%

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Influence of the number of injections on piston heat rejection under low temperature combustion conditions in an optical compression-ignition engine

Tanov

Salvador-Iborra

Andersson

et al. 2017

Energy Conversion and Management

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Section: Tangential Velocity On the Piv Planementioning

confidence: 99%

“…The resulting temperatures are summarized in table 5. Gas-wall heat transfer coefficient h was calculated with correlation 10, due to Colburn [45] and used by Morel [19].…”

Section: Heat Transfer Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of the number of injections on piston heat rejection under low temperature combustion conditions in an optical compression-ignition engine

Tanov

Salvador-Iborra

Andersson

et al. 2017

Energy Conversion and Management

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“…Magnitudes for and ̅̅̅̅̅̅ are derived from the PIV measurements and averaged over a layer with thickness equal to 5% of a characteristic length of the bowl (maximum radius of the bowl for this study) [28].…”

Section: Experimental Wall Heat Transfer Coefficient Calculationmentioning

confidence: 99%

Influence of spatial and temporal distribution of Turbulent Kinetic Energy on heat transfer coefficient in a light duty CI engine operating with Partially Premixed Combustion

Tanov

Pachano

Andersson

et al. 2018

Applied Thermal Engineering

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Emission regulations together with the need of more fuel-efficient engines have driven the development of promising combustion concepts in compression ignition (CI) engines. Most of these combustion concepts, lead toward a lean and low temperature combustion potentially suitable to achieve lower emission and fuel consumption levels compared to conventional diesel combustion. In this framework, Partially Premixed Combustion (PPC) using gasoline as fuel is one of the most accepted concepts. There are numerous studies focused on studying concepts such as PPC from the emissions point of view. Nonetheless, there is a lack of knowledge regarding changes in heat transfer introduced by the use of these combustion concepts. It is worth noting that heat transfer can be considered as a key aspect behind possible engine performance improvements. Thus, the reliable estimation of this parameter is of considerable importance. Additionally, a better understanding of how events such as injection and combustion might affect heat transfer is also relevant. To gain insight into gasoline PPC heat transfer coefficient, its evolution during late compression and early expansion were studied. In particular, this work aims to analyze Turbulent Kinetic Energy (TKE) spatial and temporal evolution influence on heat transfer coefficient. The analysis is based on experimental TKE maps derived from Particle Image Velocimetry (PIV) data. For the heat transfer coefficient estimation a modified Woschni correlation has been used. Results from several injection strategies and a reference motored case have been analyzed. It has been found that injection strategy has a considerable influence on the TKE field and hence on heat transfer coefficient evolution. 1 Introduction Low Temperature Combustion (LTC) technologies, like Homogenous Charge Compression Ignition (HCCI) [1-3], Partially Premixed Combustion (PPC) [4,5] and Reactivity Controlled Compression Ignition (RCCI) [6-9] have been widely studied in the last decade because they are expected to achieve low engine-out emissions along with high thermal efficiency. In this context, gasoline PPC has received increasingly attention due to its potential for simultaneously reducing fuel consumption and NOx emissions in gasoline Spark Ignition (SI) engines, and its capability to avoid soot and NOx emissions in CI diesel engines. Several experimental and numerical investigations of this combustion type have been performed over the recent years. PPC is achieved by controlling the injection events, inlet temperature and pressure, and composition of the fuel-air mixture, so that it ignites close to Top Dead Center (TDC). It is

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“…On the contrary, slow-response sensors are free of questioning due to the technique's simplicity. They are un- able to provide sampling within an engine cycle but it is known that, in the solid, temperature changes become quasi-steady within a very short distance from the surface [133]. In summary, if one is willing to sacrifice temporal resolution, slow-response sensors are a suitable solution that have benefits in terms of reliability and can generally provide a higher spatial resolution than fast-response sensors because sensors are smaller.…”

Section: Thermocouple Installationmentioning

confidence: 99%

A contribution to the global modeling of heat transfer processes in Diesel engines

Iborra¹

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Current challenges in research and development of powertrains demand new computational tools capable of simulating vehicle operation under very diverse conditions. This is due, among other reasons, to new homologation standards in the automotive sector requiring compliance of exhaust emissions regulations under any possible driving condition on the road. Global engine or vehicle models provide many advantages to engineers because they allow to reproduce the entire system under study, considering the physical processes that take place in different components and the interactions among them. This thesis aims to enable the modeling of heat transfer processes in a complete engine simulation tool developed at CMT-Motores Térmicos research institute. This 0D/1D simulation tool is called Virtual Engine Model (VEMOD).The development of heat transfer models comprises the engine block and the ancillary systems. The model of heat transfer in the engine block deals with the central problem of in-cylinder convection by means of a combination of experimental research, CFD simulation and multizone 0D modeling. The other thermal processes present in the engine block are examined in order to implement suitable submodels. Once the model is complete, it undergoes a validation with experimental transient tests. Afterwards, the ancillary systems for engine thermal management are brought into focus. These systems are considered by means of two new models: a model of heat exchangers and a model of thermo-hydraulic circuits. The development of those models is reported in detail.Lastly, with the referred thermal models integrated in the global simulation tool, a validation study is undertaken. The goal is to validate the ability of the Virtual Engine Model to capture the thermal response of a real engine under various operating conditions. To achieve that, an experimental campaign combining tests under steady-state operation, under transient operation and at different temperatures is conducted in parallel to the corresponding simulation campaign. The capacity of the global engine simulations to replicate the measured thermal evolution is finally demonstrated.As you set out for Ithaka hope the voyage is a long one, full of adventure, full of discovery. Cavafy AcknowledgmentsA PhD is a long voyage of discovery and personal growth. Far from being a solitary journey, there are many people who intervene to make possible that all efforts reach a good conclusion. Having reached this point, I wish to acknowledge all people and institutions that have contributed to this thesis by one means or another.First of all, I want to thank my PhD supervisor, Prof. Pablo Olmeda, for his teachings and support over these years. I'm also grateful to Dr. Antonio García for sharing with me his invaluable knowledge about research communication. Another important figure in this period has been Dr. Jaime Martín, from whom I have learned a lot by collaborating in research projects. Also thanks to Dr. Francisco Arnau, for his compromise in building the Virtual Engine...

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Methods for heat transfer and temperature field analysis of the insulated diesel: Phase 3, Final report

Cited by 6 publications

References 2 publications

Influence of the number of injections on piston heat rejection under low temperature combustion conditions in an optical compression-ignition engine

Influence of the number of injections on piston heat rejection under low temperature combustion conditions in an optical compression-ignition engine

Influence of spatial and temporal distribution of Turbulent Kinetic Energy on heat transfer coefficient in a light duty CI engine operating with Partially Premixed Combustion

A contribution to the global modeling of heat transfer processes in Diesel engines

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