Unsteady Heat Transfer in Engines

Overbye, Vern D.; Bennethum, James E.; Uyehara, O. A.; Myers, P. S.

doi:10.4271/610041

Cited by 109 publications

(40 citation statements)

References 9 publications

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“…It seems that the effects caused by combustion dominate those of the gas flow. The measurements of Overbye et al [20] did not even show a great difference in the heat flux if the shroud of the intake valve was changed in contrast to their measurements under motored conditions. 325…”

Section: Influence Of Intake Flowcontrasting

confidence: 39%

“…Overbye et al [20] varied the intake manifold pressure and found an increase in the heat transfer with a higher pressure. Both the heat flux from the cylinder walls during the intake and exhaust stroke and the heat flux to the cylinder walls 155 during the compression and expansion stroke were higher.…”

Section: Influence Of Intake Pressurementioning

confidence: 99%

“…Both have an effect on the engine load, so this section is related to that of a changing load. Overbye et al [20] found that the peak and total cycle heat flux augmented with a small increase in the intake 330 manifold pressure (0.27 bar). Saulnier et al [40] varied the intake manifold pressure between 0.3 and 0.65 bar, probably with a throttle (not specified in the paper), and found that the heat flux increased linearly with the increasing intake pressure.…”

Section: Influence Of Volumetric Efficiencymentioning

confidence: 99%

“…Overbye et al [20] and Boggs and Borman [18,19] used coaxial sensors to measure the heat transfer inside a CFR (Cooperative Fuel Research) engine with a shrouded intake valve, varying the shroud position to produce different flows and levels of turbulence. They found that the heat flux was higher for each other are strongly correlated.…”

Section: Influence Of Intake Flowmentioning

confidence: 99%

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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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Section: Influence Of Intake Flowcontrasting

confidence: 39%

Section: Influence Of Intake Pressurementioning

confidence: 99%

Section: Influence Of Volumetric Efficiencymentioning

confidence: 99%

Section: Influence Of Intake Flowmentioning

confidence: 99%

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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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“…Research on engine heat transfer has had a long history at U.W., starting with the work of Overbye et al (1961) and Ebersole et al (1963). At the start of the period covered by this report several projects sponsored by the Army had just ended (Van Gerpen et al, 1985) and .…”

Section: 3 Heat Transfermentioning

confidence: 99%

Center for Advanced Propulsion Systems

Borman¹,

Corradini²,

Farrell³

et al. 1993

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Public reporting burden for this c011ection of informatio IS estimated to averaage I hour Per response. including the time lot reiew0g mstructions, searching existing data source%.gathern and maintainr th, data needed, and completing and reviewing the collection of information Send comments regarding this burden estimate or any other aspect of this collection Of information, including suggestions for reducing this burden. SUPPLEMENTARY NOTESThe view, opinions and/or findings contained in this report are those of the author(s) and should not be construed as an official Department of the Army position, policy, or decision, unless so designated by other documentation. 12a. DISTRIBUTION / AVAILABIUTY STATEMENT 12b. DISTRIBUTION CODEApproved for public release; distribution unlimited. ABSTRACT (Maximum 200 words)This final report covers a six year period of research conducted by the Engine Research Center. The objectives of the ERC are: 1) to train students in special areas of diesel research of interest to the Army and its industrial suppliers, 2) provide a source of consultation for the Army, 3) provide knowledge and research tools for solution of long range problems of interest to the Army, 4) provide solution methods for problems of immediate interest to the Army, 5) to identify and explore new technologies which have potential value to the Army. A brief account is given of how these objectives were addressed. Subjects covered are; faculty, facilities, publications, and research results. The research topic areas discussed are: engine modeling; canbustion, emissions and fuels; heat transfer; fluid mechanics; diesel sprays; lubrication, mechanical design and materials.14. SUBJECT Comparison between measured and predicted cylinder 36 pressure (left) and wall heat flux (right) for premixedcharge SI engine combustion using heat transfer model with (modified case) and without (original) the effect of compressibility and unsteadiness. Engine speed 1500 rev/min. 7.1.2Comparison between computed (dashed line) and 36 measured (solid line) cylinder pressures (left) and wall heat flux (right) for compression ignited, homogeneous charge engine combustion (engine speed 1200 rev/min, compression ratio 10.5, swirl ratio 1.8, equivalence ratio 0.4). 7.1.3Predicted pressure histories obtained by incorporating the 39 multistep Shell ignition model (Case 2) and the standard one-step Arrhenius kinetics model (Case 1). 7.1.4Intake flow computation using the unstructured grid 40 version of KIVA-3 for stationary valves. 7.1.5Calculated cylinder pressures with and without ignition at 44 100 rpm and initial air temperatures of 241 K and 298 K. Optical window relative position to the combustion 61 chamber(part 2 of 2). 7.2.9The instrumentation system. 62 7.2.10 Flame temperature and soot concentration factor KL at 63 three angular positions for window A (24, 25, 26-3). 7.2.11Flame temperature and soot concentration factor KL at 64 three angular positions for window B (24, 25, 26-3). 7.2.12Flame temperature and soot concentration facto...

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Belastung von Motorbauteilen

Mollenhauer¹

1997

Handbuch Dieselmotoren

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Unsteady Heat Transfer in Engines

Cited by 109 publications

References 9 publications

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

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

Center for Advanced Propulsion Systems

Belastung von Motorbauteilen

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