A New Piston Insulation Concept for Heavy-Duty Diesel Engines to Reduce Heat Loss from the Wall

Uchida, Nozomu; Osada, Hideaki

doi:10.4271/2017-24-0161

Cited by 28 publications

(25 citation statements)

References 9 publications

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“…The improvement in heat loss reduction in Ref. [10] corresponds to a piston with a thermal conductivity of 10 W/m-K in the simulations. The reduction in CHM from 1 to 0.5 with a 48 W/m-K PTC results in the reduction of cylinder heat transfer losses by 12 kW (≈7.5 % of fuel energy).…”

Section: High-pressure Unit Piston Insulation and Convection Heat Mulmentioning

confidence: 94%

“…The challenges in designing an adiabatic piston are immense. However, Uchida and Osada [10] have demonstrated an insulated piston concept that reduced heat loss by 1.5-2.5 % of the fuel energy by coating Zirconia on the backside of a piston to elevate the surface temperature without compromising mechanical efficiency. The proposed piston insulation did not lead to combustion deterioration as the piston surface on the combustion side was not modified.…”

Section: High-pressure Unit Piston Insulation and Convection Heat Mulmentioning

confidence: 99%

“…Therefore, considerable challenges lie in the path of accomplishing low-temperature combustion with diesel fuel. The piston insulation proposed by Uchida and Osada [10] coupled to a lowtemperature combustion with CHM of 0.5 or below would enable the concept to achieve an indicated thermal efficiency >60%.…”

Section: High-pressure Unit Piston Insulation and Convection Heat Mulmentioning

confidence: 99%

“…The reduction in hot tank pressure due to increased consumption by the expander improves efficiency up to a point. 10. This effect on the ITE is due to a trade-off between pressure acting on the expander and the back-pressure acting on the highpressure units.…”

mentioning

confidence: 99%

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Double Compression Expansion Engine: A Parametric Study on a High-Efficiency Engine Concept

Shankar

Johansson

Andersson

2018

SAE Technical Paper Series

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The Double compression expansion engine (DCEE) concept has exhibited a potential for achieving high brake thermal efficiencies (BTE). The effect of different engine components on system efficiency was evaluated in this work using GT Power simulations. A parametric study on piston insulation, convection heat transfer multiplier, expander head insulation, insulation of connecting pipes, ports and tanks, and the expander intake valve lift profiles was conducted to understand the critical parameters that affected engine efficiency. The simulations were constrained to a constant peak cylinder pressure of 300 bar, and a fixed combustion phasing. The results from this study would be useful in making technology choices that will help realise the potential of this engine concept.

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Section: High-pressure Unit Piston Insulation and Convection Heat Mulmentioning

confidence: 94%

Section: High-pressure Unit Piston Insulation and Convection Heat Mulmentioning

confidence: 99%

Section: High-pressure Unit Piston Insulation and Convection Heat Mulmentioning

confidence: 99%

mentioning

confidence: 99%

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Double Compression Expansion Engine: A Parametric Study on a High-Efficiency Engine Concept

Shankar

Johansson

Andersson

2018

SAE Technical Paper Series

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“…So, in most current works, the optics of ceramic heat-insulating materials and coatings have not become the subject of research [1,3,[15][16][17][18][19]. Without knowledge optics of material, the empirical techniques for estimating radiant heat transfer parameters are still offered as the base engineering methods of calculation nowadays [2,3].…”

Section: Introductionmentioning

confidence: 99%

Thermal Mode Optimization of Combustion Chamber Walls for Power-Plants Using Semitransparent Porous Ceramics

et al. 2020

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The paper examines control and management by thermal mode of the internal surface of heat-insulated combustion chamber walls for green & efficient diesel and gas turbine engines due to the application of opaque or semitransparent thermal barrier materials (coatings). The authors’ model is devoted to combined radiant heat transfer both inside the heat-insulated combustion chamber and its ceramics walls, which could be scattering and absorbing for penetrating radiant component in the subsurface volume of optically heterogeneous porous material. The influence of thermal conduction, scattering (absorption) and external convective effects on the increase of the internal overheating zone in subsurface layers is simulated under intensive radiation. The unique set of optical, thermal-physical and mechanical properties of structural ceramics, depending on their porosity, were first proposed. The radiation fields of the absorbed energy in the near IR region and the corresponding temperature distributions in the modeled opaque and semitransparent ceramics walls were calculated under a stationary radiant-convective heat load during the active combustion phase at time intervals 0.01…0.1 s (diesel engines) and 10...100 s (turbine ones). In order to control the emission of nitrogen oxides, the authors propose a generation model of NOx, its growth or reduction caused by the management of radiant overheating inside semitransparent heat-insulation in which surface temperature is due to volumetric radiant absorption. It is shown that for semitransparent materials (coatings), the optimal thermal mode is determined first of all by thermal radiant characteristics in near IR at heating small times and it begins to correct at long ones due to the effect of thermal conductivity. This process may be modeled and regulated by the selected microstructural porosity of ceramic heat insulation.

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Universal Effect of Subsurface Thermal Radiant Overheating for Semitransparent Materials and Natural Media

Merzlikin

Parshina

Marynenko

2022

Lecture Notes in Mechanical Engineering

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A New Piston Insulation Concept for Heavy-Duty Diesel Engines to Reduce Heat Loss from the Wall

Cited by 28 publications

References 9 publications

Double Compression Expansion Engine: A Parametric Study on a High-Efficiency Engine Concept

Double Compression Expansion Engine: A Parametric Study on a High-Efficiency Engine Concept

Thermal Mode Optimization of Combustion Chamber Walls for Power-Plants Using Semitransparent Porous Ceramics

Universal Effect of Subsurface Thermal Radiant Overheating for Semitransparent Materials and Natural Media

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