Effects of Deposit Properties on Volumetric Efficiency, Heat Transfer, and Preignition in Internal Combustion Engines

Bradish, J. P.; Myers, P. S.; Uyehara, O. A.

doi:10.4271/660130

Cited by 18 publications

(4 citation statements)

References 10 publications

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“…Since at unsteady thermal conditions , , , then, taking into account equality (5), equation (12) takes the form (13) Substituting equations (10) and (11) into equation (13) allows us to write the following (14) The combination of values of the rotational speed of the crankshaft and the position of the control element of the thermostat h characterize the mode of operation R and the load on the cooling system.…”

Section: Resultsmentioning

confidence: 99%

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Regulation and control in cooling systems of internal combustion engines

et al. 2019

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The paper is devoted to the urgent problem of improving the automatic regulation of the thermal state of internal combustion engines and controlling the water-chemical cooling regimes during the transition to high-temperature cooling. Principal and functional diagrams of cooling systems with improved control are presented. The prospects of controlling the pressure in the internal circuit of high-temperature engine cooling systems and the automatic control of the physicochemical characteristics of the coolant have been proved.

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Section: Resultsmentioning

confidence: 99%

“…Marine diesel engine as an object of regulation by thermal state should be considered as a multi-factor, multi-parameter, dynamic, stochastic object, the control of which requires complex approaches and methods, examples of which are presented in [12][13][14].…”

Section: Problem Statementmentioning

confidence: 99%

Regulation and control in cooling systems of internal combustion engines

et al. 2019

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“…19,20 Other commonly cited mechanisms include deposit and unburned hydrocarbon induced ignition. 21–24…”

Section: Introductionmentioning

confidence: 99%

Optimizing split fuel injection strategies to avoid pre-ignition and super-knock in turbocharged engines

Singh

Morganti

Dibble

2019

International Journal of Engine Research

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Fuel injection strategies often have a considerable impact on pre-ignition in high specific output gasoline engines. Splitting the injection event into two or more pulses has been widely explored as one means of reducing pre-ignition. As effective as these strategies can be with respect to pre-ignition suppression, they often introduce other compromises into the combustion process, for example, reduced indicated mean effective pressure or greater cycle-to-cycle variation. This study examines a split injection strategy with up to three injection pulses for suppressing pre-ignition, while optimizing the start of injection and duration of injection to minimize the associated compromises on the combustion process. The results demonstrate that splitting the injection event generally lowers the in-cylinder temperature and reduces the fuel mass that reaches the cylinder liner. This leads to a lower probability of creating oil-fuel droplets, which may act as a precursor for pre-ignition. The split injection strategy with a late injection when the piston is close to top dead center is shown to perform even better in terms of pre-ignition suppression, while providing comparable indicated mean effective pressure and cycle-to-cycle variation to the baseline case with a single injection pulse. Finally, the injection pressure is varied to establish an optimal combination of operating parameters for avoiding pre-ignition in high specific output gasoline engines.

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“…Such effects have been responsible for local melting in pistons, warping of valves, or even engine seizure (Heron 1954). As a result of the thermal insulating behavior of combustion-chamber deposits there have been several attempts (Mikita and Bettony 1953, Overbye et al 1961, Bradish et al 1966, and Nakamura et al 1979 to characterize deposit thermal properties; thermal conductivity, k, and thermal diffusivity, 0: = kloc. The most recent investigations have been performed by Anderson et al (1982Anderson et al ( , 1985Anderson et al ( , and 1986).…”

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confidence: 99%

Investigation of Combustion-Chamber Deposit Thermal Behavior Utilizing Optical RadiationMeasurements in a Fired Engine

Harder

Anderson

1988

Combustion Science and Technology

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An infrared radiometer, which incorporated three optical paths and operated between 3.5-4.0 I'm, was used to obtain transient surface temperatures in a fired engine. An integrated form of the equation of radiative transfer was applied to each optical path allowing gas emission, gas absorption and deposit surface radiation within the combustion-chamber to be characterized during a single cycle. Measurements of a simulated deposit were made at various temperatures and spark advance with the engine fired on methane and again on gasoline. Radiative characteristics of the combustion gases such as absorption and emission were investigated at several different operating conditions. A maximum error of 6% was found for temperature measurements between 660 and 900 Kelvins.Using a fast surface thermocouple with its junction located at the inner surface of the combustionchamber wall, two combustion-chamber deposits were accumulated for different lengths of time. Deposit surface and interface temperatures were investigated at several different operating conditions for each deposit. Utilizing the experimentally obtained deposit surface and interface temperatures, deposit thermal conductivity (k) and heat capacity (Qc) were determined via a computational model which treated k as a function of temperature. Values obtained for k and oc were well within the range of those reported for various forms of graphite.

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Effects of Deposit Properties on Volumetric Efficiency, Heat Transfer, and Preignition in Internal Combustion Engines

Cited by 18 publications

References 10 publications

Regulation and control in cooling systems of internal combustion engines

Regulation and control in cooling systems of internal combustion engines

Optimizing split fuel injection strategies to avoid pre-ignition and super-knock in turbocharged engines

Investigation of Combustion-Chamber Deposit Thermal Behavior Utilizing Optical RadiationMeasurements in a Fired Engine

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