Low Heat Rejection Engine Research Status: Where Do We Go from Here?

Reddy, C. S.; Domingo, Neus; Graves, R.S.

doi:10.4271/900620

Cited by 28 publications

(24 citation statements)

References 26 publications

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“…Most of these materials are less ductile than the cast iron and steel components that they replace. Due to this characteristic, these materials suffer low durability and often have not been able to sustain the harsh environment of the engine combustion chamber [19][20][21][22].…”

Section: Results For Increases Of the Wall Temperaturementioning

confidence: 99%

“…Some of the past work has referred to this technology as adiabatic engines, but this description is not preferred, since no engine can be 100% adiabatic. Much literature (e.g., [19][20][21][22]) is available that describes previous attempts at achieving LHR engines. Since LHR engines would be expected to possess higher gas temperatures, these concepts have not been applied to spark-ignition engines, since spark knock would be more likely.…”

Section: Introductionmentioning

confidence: 99%

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The Thermodynamics of Internal Combustion Engines: Examples of Insights

Caton

2018

Inventions

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A major goal of the development of internal combustion (IC) engines continues to be higher performance and efficiencies. A major aspect of achieving higher performance and efficiencies is based on fundamental thermodynamics. Both the first and second laws of thermodynamics provide strategies for and limits to the thermal efficiencies of engines. The current work provides three examples of the insights that thermodynamics provides to the performance and efficiencies of an IC engine. The first example evaluates low heat rejection engine concepts, and, based on thermodynamics, demonstrates the difficulty of this concept for increasing efficiencies. The second example compares and contrasts the thermodynamics associated with external and internal exhaust gas dilution. Finally, the third example starts with a discussion of the Otto cycle analysis and explains why this is an incorrect model for the IC engine. An important thermodynamic property that is responsible for many of the observed effects is specific heat.

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Section: Results For Increases Of the Wall Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Thermodynamics of Internal Combustion Engines: Examples of Insights

Caton

2018

Inventions

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“…If the energy normally rejected to the coolant could be recovered instead on the crankshaft as useful work, then a substantial improvement in fuel economy would be obtained. Increased thermal efficiency and elimination of the cooling sys-tem are the major promises of the LHR engine [3].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the LHR engine designs promise to meet the increasingly stringent regulations in the areas of fuel economy and permissible emissions levels [3,4]. At the same time, exhaust energy rise, which accompanies this, can be effectively used in turbocharged engines.…”

Section: Introductionmentioning

confidence: 99%

“…One might expect lower HC from LHR diesel because the shortened ignition delay associated with higher temperatures decreases to opportunity for over mixing of fuel beyond the lean combustion limit and because the generally higher cylinder-gas temperature during the expansion stroke should encourage oxidation of any unburned fuel escaping the primary process. However, a review of the limited published data on measured emissions from LHR diesel shows that while there are instance where HC did decrease, there are others where it increased [3].…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of NOx emissions in a low heat rejection diesel engine

Raj.P¹,

Velmurugan²

2016

IJMTER

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-In this study, an experimental study of the effects of injection timing on nitrogen oxide (NO x ) emissions of a low heat rejection (LHR) Turbo charged direct injection diesel engine was conducted. The injection timing and brake specific fuel consumption (BSFC) trade-off must be considered together in performance and NO x emissions analysis. For the original injection timing of the 20 • before top dead centre, the brake Specific fuel consumption value of the LHR engine was approximately 6% lower than the original engine. NO x emissions were also higher (about 9%) than the original engine. To reduce NO x emissions released by diesel engines, the method of injection timing retard was utilized. Thus, the LHR engine was tested for two different injection timings; 18 • and 16 • crank angle before top dead centre (BTDC), at the same engine speeds and load conditions. The results showed that the BSFC and NO x emissions were reduced 2% and 11%, respectively by retarding the injection timing. Optimum injection timing for the LHR engine was obtained through decreasing by 2 • BTDC.

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An Analysis of Residual Stresses in Thermal Barrier Coatings: A FE Performance Assessment

Taymaz

2009

Plasma Processes & Polymers

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Internal combustion engines have been widely used for past 100 years. In the development of engine components a number of special techniques are used to compact the hostile operating environment, which usually includes high and cyclic forces, high and cyclic temperatures, sliding and often corrosion and/or erosion. In this study, 3‐D finite element structural and thermal analyses were carried out on both uncoated (without coating) and ceramic‐coated engine piston. A 150 µm super alloy bond coating (NiCrAlY) was first applied to the piston. Then, piston was covered by 350 µm thickness of MgZrO3 as top coating. The analysis can be utilized to detect possible thermal problem spots in an engine, and to provide input data for general engine modeling and engine lubrication and wear studies.

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Low Heat Rejection Engine Research Status: Where Do We Go from Here?

Cited by 28 publications

References 26 publications

The Thermodynamics of Internal Combustion Engines: Examples of Insights

The Thermodynamics of Internal Combustion Engines: Examples of Insights

Experimental study of NOx emissions in a low heat rejection diesel engine

An Analysis of Residual Stresses in Thermal Barrier Coatings: A FE Performance Assessment

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