The In-Situ Measurement of the Thermal Diffusivity of Combustion Chamber Deposits in Spark Ignition Engines

Hayes, T. K.; White, Robert A.; Peters, James E.

doi:10.4271/920513

Cited by 8 publications

(2 citation statements)

References 11 publications

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“…Following early studies by Nishiwaki 18 and Hayes et al, 19 Nishiwaki and Hafnan investigated the thermal conductivity and thermal diffusivity of the deposits in diesel and gasoline engines. 20 One diesel engine with a stroke of 90 mm and a bore of 94 mm and one gasoline engine with a stroke of 79 mm and a bore of 66 mm were used to conduct the experiments.…”

Section: Existence Of Depositsmentioning

confidence: 99%

A review of experimental studies on deposits in the combustion chambers of internal combustion engines

Shu

Dong

Liang

2012

International Journal of Engine Research

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This article reviews experimental studies on deposits in engine combustion chambers, with emphasis on deposit composition, damage to engines, formation mechanisms and study methods. The existence of combustion chamber deposits will definitely influence performance and emissions of engines, and is inevitable with the use of petroleum fuel and lubricating oil. These all make it necessary to study the formation, composition, structure and influential factors of deposits, which will provide the basis for reducing deposits in engines. Influential factors and methods of reducing deposit formation are also included. First, the deposit damage to engines is briefly introduced, with a focus mainly on the decline in engine performance and the deterioration of emissions, and the reasons for these phenomena are explained. Next, conclusions on deposit research approaches to their chemical composition and physical structure are drawn. Finally, with regards to deposit formation in gasoline and diesel engines, deposit composition and factors influencing deposit formation, such as engine type, fuel type, oil type, additives, exhaust gas recirculation, etc., are enumerated through experimental studies on engines. Studies on deposit formation with some newly developed types of fuel are also included. The mechanism of deposit formation under these different conditions is explained, and the methods for reducing deposit formation are summarized.

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Section: Existence Of Depositsmentioning

confidence: 99%

A review of experimental studies on deposits in the combustion chambers of internal combustion engines

Shu

Dong

Liang

2012

International Journal of Engine Research

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“…The thermophysical properties of combustion chamber deposits [26] and aluminum [27] are listed in Table 4.1.…”

Section: X2mentioning

confidence: 99%

Combustion Chamber Deposit Effects on Hydrocarbon Emissions from a Spark-Ignition Engine

Haidar

Heywood

1997

SAE Technical Paper Series

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Data on the effect of combustion chamber deposits (CCD) on the HC emissions from spark-ignition engines has been scarce and contradictory. With more stringent emissions standards set by the EPA taking effect, quantifying the effect of CCDs on HC emissions from a modem spark-ignition engine is of significant importance. The objectives of this work can be summarized in three points: quantify the contribution of CCDs to the total engine-out HC emissions; identify the effect of combustion chamber deposits on the HC emissions from a matrix of single-component fuels; develop a model to describe the mechanism(s) by which CCDs lead to an increase to HC emissions. The engine is run for periods ranging from 100 to 25 hours, on a deposit build-up cycle. During deposit accumulation, the HC emissions are continuously measured at several operating conditions using an additized, specially-designed fuel that promotes CCD accumulation. In addition, HC emission measurements are taken using isooctane, benzene, toluene and xylene with the deposited and then clean engine.The experimental results show that CCDs contribute to about 15% of the total engine-out HC emissions from the deposit build-up fuel and from the four single-component fuels. Starting from a clean-engine level, the HC emissions increase rapidly in the first 10 hours of deposit accumulation and stabilize after about 25 hours. The deposits continue to grow well beyond the point where the HC emissions stabilize. After engine disassembly and CCD removal, the HC emissions drop back to their clean-engine levels, confirming the effect of CCDs on the HC emissions. The data shows no significant difference in the effect of CCDs on the HC emission increase among the four single-component fuels. The deposit pore size distribution is quantified using mercury porosimetry measurements. Using these measurements, it is concluded that the filling of deposit pores with fuel-air mixture at uniform pressure(deposit crevice mechanism) is the dominant mechanism. Accounting for oxidation of some of the fuel stored in the cylinder head and exhaust ports, the model overpredicts the experimental data by about 50%. Thesis Advisor John Heywood Professor, Mechanical Engineering ACKNOWLEDGEMENTS

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Combustion Chamber Temperature and Instantaneous Local Heat Flux Measurements in a Spark Ignition Engine

Hayes

White

Peters

1993

SAE Technical Paper Series

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The In-Situ Measurement of the Thermal Diffusivity of Combustion Chamber Deposits in Spark Ignition Engines

Cited by 8 publications

References 11 publications

A review of experimental studies on deposits in the combustion chambers of internal combustion engines

A review of experimental studies on deposits in the combustion chambers of internal combustion engines

Combustion Chamber Deposit Effects on Hydrocarbon Emissions from a Spark-Ignition Engine

Combustion Chamber Temperature and Instantaneous Local Heat Flux Measurements in a Spark Ignition Engine

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