Tribological Systems for High Temperature Diesel Engines

Sutor, Paul; Bryzik, Walter

doi:10.4271/870157

Cited by 25 publications

(5 citation statements)

References 13 publications

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“…This problem is compounded by the fact that many high-temperature lubricants cannot be pumped by conventional means at ambient temperatures, making lubrication during startup an issue. Research in selflubricating composites by Sutor [14], Gaydos [15], and others demonstrate some promise in solid lubrication, but lubrication of hot surfaces remains a significant issue. It is important to note that engines with conventionally cooled liners avoid this problem, and can still use typical engine lubricants, rings, etc.…”

Section: Previous Lhr Research Effortsmentioning

confidence: 98%

Exploring the Pathway to High Efficiency IC Engines through Exergy Analysis of Heat Transfer Reduction

Johnson

Edwards

2013

SAE Int. J. Engines

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Heat transfer is one of the largest causes of exergy destruction in modern engines. In this paper, exergy distribution modeling was used to determine the potential of reduced engine heat transfer to provide significant gains in engine efficiency. As known from prior work, of itself, reducing heat transfer creates only a small increase in efficiency-most of the exergy is redirected into the exhaust stream-requiring both mechanical and thermal recovery of the exhaust exergy. Mechanical regeneration, through turbocharging and over-expansion, can lead to efficiencies exceeding 50%. Adding thermal regeneration, through high enthalpy steam injection or a bottoming cycle, can increase the efficiency potential to approximately 60%. With implementation of both mechanical and thermal regeneration, the only remaining cause of substantial exergy destruction is the combustion process. Thus, efficiency gains significantly beyond 60% are only possible by reducing the entropy generated in the fuel conversion process.

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Section: Previous Lhr Research Effortsmentioning

confidence: 98%

Exploring the Pathway to High Efficiency IC Engines through Exergy Analysis of Heat Transfer Reduction

Johnson

Edwards

2013

SAE Int. J. Engines

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“…Such materials are often referred to as self-lubricating composites. Significant research efforts have been undertaken by Adiabatics Inc., et al [18,19], the Midwest Research Institute [20], and Battelle. [21,22,23] Recent work done by Battelle [24] describes the successful application of a well known "Boes" compact to temperatures of 850 o C. [25,26] The NASA Lewis Research Center has shown the effectiveness of coatings of some oxides and fluorides to 900 o C. [27,28] Nickel/molybdenum-bonded titanium carbide cermets [29] and nickel/molybdenumbonded chromium carbide cermets [30] have also shown to be effective.…”

Section: High Temperature Tribologymentioning

confidence: 99%

An Optimized Low Heat Rejection Engine for Automotive Use - An Inceptive Study

Leidel¹

1997

SAE Technical Paper Series

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An unconventional low heat rejection (LHR) engine design is described. Previous research efforts into LHR concepts, including high temperature materials and tribology, are reviewed. The continued reliance on conventional compression ignition designs is identified as a significant roadblock. Therefore, a set of design criteria is established, and an original design is formulated. The powerplant consists of an independent positive displacement compressor and expander, a high pressure combustor, and a compressed air accumulator. Compatibility with ceramic materials and high temperature combustion were primary goals. Inherent characteristics include full torque from zero RPM, enhanced combustion, improved efficiency under part load operation, and increased volumetric and thermodynamic efficiencies. These potential improvements warrant the design and construction of a prototype for further study.

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“…It was realized that special lubricants were needed for low heat rejection engines. A five-year programme to develop high temperature resistant liquid lubricants was implemented and new additives to reduce friction and wear were also investigated [5]. The approach consisted of what US TACOM called the 'three-fold line of defense': (a) a synthetic high-temperatureresistant liquid lubricant, (b) a solid lubricant to provide protection if the liquid lubricant failed, and (c) self-lubricating materials in the case that the liquid and the solid lubricants failed [5].…”

Section: Introductionmentioning

confidence: 99%

Oil consumption studies in a single-cylinder diesel engine using solid-film lubricants

Perez

Boehman

Perez

2008

Proceedings of the Institution of Mechanical Engineers, Part J:

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Solid-film additives (tungsten disulfide, lead sulfide, and graphite fluoride) were dispersed in a high temperature liquid lubricant, and their performance was evaluated in a single-cylinder diesel engine. Oil consumption and wear of the piston and rings were determined during the tests, and changes in oil properties such as viscosity and total acid number (TAN) were monitored as well. Tungsten disulfide and lead sulfide proved to be effective additives to reduce friction and wear under the operational conditions encountered in the diesel engine. This contrasted with the behaviour of graphite fluoride, which produced high friction and wear. The observed oil consumption correlated with degradation rates of the solid-film additive dispersions as indicated by the TAN, although high abrasion was also observed in the case of graphite fluoride. The use of solid-film additives had no effect on the brake-specific fuel consumption with respect to the reference baseline oil.

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Tribological Systems for High Temperature Diesel Engines

Cited by 25 publications

References 13 publications

Exploring the Pathway to High Efficiency IC Engines through Exergy Analysis of Heat Transfer Reduction

Exploring the Pathway to High Efficiency IC Engines through Exergy Analysis of Heat Transfer Reduction

An Optimized Low Heat Rejection Engine for Automotive Use - An Inceptive Study

Oil consumption studies in a single-cylinder diesel engine using solid-film lubricants

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