Thermo-Swing Wall Insulation Technology; - A Novel Heat Loss Reduction Approach on Engine Combustion Chamber -

Kawaguchi, Akio; Iguma, Hiroki; Yamashita, Hideo; Takada, Noriyuki; Nishikawa, Naoki; Yamashita, Chikanori; Wakisaka, Yuki; Fukui, Kenji

doi:10.4271/2016-01-2333

Cited by 41 publications

(43 citation statements)

References 22 publications

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“…Without direct measurement in the current work it is not possible to confirm or quantify changes in piston surface temperature; however the observations of reduced ignition delay in the present work ( Figure 12) are consistent with the effects of increased piston surface temperature reported in the literature [23]. Similarly, the small increase in the mixing controlled burn ratereducing the overall combustion duration by ~0.8-0.9 °CAthat is presented in Figures 13 and 14, and Table 3 for the steel piston may also indicate a higher piston surface temperature as the increase in burn rate is consistent with the expected effects of reduced heat loss [10]. In turn, the slightly earlier heat release could be responsible for minor reduction in exhaust gas temperature shown in Figure 11.…”

Section: = − ( + ) (3)supporting

confidence: 91%

“…The low thermal conductivity and heat capacity of these socalled "Temperature Swing Coatings" allows for fast surface cooling during the exhaust and intake strokes, thus maintaining volumetric efficiency, while also providing high surface temperatures in the late compression and early expansion strokes, thus leading to lower heat transfer losses from the hot gases to the walls. Application of a SiRPA coating on the piston of a diesel engine resulted in an improvement of 2% in fuel consumption and ~1.5% in indicated work along with a reduction in heat losses and an increase in exhaust enthalpy [10]. The effects of this new coating on indicated work, heat losses and exhaust enthalpy have been shown to be independent of EGR rate and injection timing [9].…”

Section: Introductionmentioning

confidence: 98%

“…In order to overcome this disadvantage, researchers have recently developed new coating materials using silica reinforced porous anodised aluminium (SiRPA) that allow the combustion chamber surfaces to follow the transient gas temperature during the cycle [7][8][9][10]. The low thermal conductivity and heat capacity of these socalled "Temperature Swing Coatings" allows for fast surface cooling during the exhaust and intake strokes, thus maintaining volumetric efficiency, while also providing high surface temperatures in the late compression and early expansion strokes, thus leading to lower heat transfer losses from the hot gases to the walls.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Analysis of Steel and Aluminium Pistons for an HSDI Diesel Engine

Papaioannou¹,

Leach²,

Davy³

2019

SAE Technical Paper Series

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Chromium-molybdenum alloy steel pistons, which have been used in commercial vehicle applications for some time, have more recently been proposed as a means of improving thermal efficiency in lightduty applications. This work reports a comparison of the effects of geometrically similar aluminium and steel pistons on the combustion characteristics and energy flows on a single cylinder high-speed direct injection diesel research engine tested at two speed / load conditions (1500 rpm / 6.9 bar nIMEP and 2000 rpm / 25.8 bar nIMEP) both with and without EGR. The results indicate that changing to an alloy steel piston can provide a significant benefit in brake thermal efficiency at part-load and a reduced (but nonnegligible) benefit at the high-load condition and also a reduction in fuel consumption. These benefits were attributed primarily to a reduction in friction losses. In terms of energy transfer, switching to the steel piston design was shown to reduce heat transfer to the coolant, consistent with lower friction work and reduced conduction through the ring pack, and increase the energy transfer to the oil. Piston blowby was also greatly reduced. Ignition delay times and overall combustion durations were reduced with the steel piston design, possibly indicative of higher piston surface temperatures.

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Section: = − ( + ) (3)supporting

confidence: 91%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal Analysis of Steel and Aluminium Pistons for an HSDI Diesel Engine

Papaioannou¹,

Leach²,

Davy³

2019

SAE Technical Paper Series

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“…The use of ceramic thermal barrier coatings typically results in increased NOx emissions due to increased in-cylinder temperatures [5,6]. However, these higher cylinder temperatures have also been shown to result in higher exhaust temperatures [7,8] which may be advantageous to the exhaust after-treatment system and as such the NOx penalty might be offset by improved after-treatment performance particularly during cold-start. In addition the higher exhaust temperatures would prove beneficial to any exhaust waste heat recovery systems.…”

Section: Introductionmentioning

confidence: 99%

The Effect of an Active Thermal Coating on Efficiency and Emissions from a High Speed Direct Injection Diesel Engine

Papaioannou¹,

Leach²,

Davy³

et al. 2020

SAE Technical Paper Series

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This study looked into the application of active thermal coatings on the surfaces of the combustion chamber as a method of improving the thermal efficiency of internal combustion engines. The active thermal coating was applied to a production aluminium piston and its performance was compared against a reference aluminium piston on a single-cylinder diesel engine. The two pistons were tested over a wide range of speed/load conditions and the effects of EGR and combustion phasing on engine performance and tailpipe emissions were also investigated. A detailed energy balance approach was employed to study the thermal behaviour of the active thermal coating. In general, improvements in indicated specific fuel consumption were not statistically significant for the coated piston over the whole test matrix. Mean exhaust temperature showed a marginal increase with the coated piston of up to 6 °C. However, the normalised exhaust enthalpy showed a reduction (apart from the higher speed/load conditions when no EGR was applied). Energy transfer to the coolant was reduced by as much as 1.5 percentage points, in agreement with the expected reduction in piston heat transfer, across all operating conditions. Finally, soot emissions were increased with the coated piston, with the biggest differences between the coated and non-coated pistons observed at the lower speed/load conditions.

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“…One set of samples was sprayed by APS using solid powder YSZ feedstock, and it was a standard TBC sprayed in the industry nowadays for gas turbine applications. This sample was considered as reference sample as it has similar microstructure and thermal properties with other samples used in the previous studies for diesel engine applications (Ref 13,14). The second and the third TBCs were sprayed by SPS, both using YSZ suspension.…”

Section: Sample Sprayingmentioning

confidence: 99%

Suspension Plasma-Sprayed Thermal Barrier Coatings for Light-Duty Diesel Engines

et al. 2019

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Demands for improved fuel efficiency and reduced CO 2 emissions of diesel engines have been the driving force for car industry in the past decades. One way to achieve this would be by using thermal spraying to apply a thermal insulation layer on parts of the engine's combustion chamber. A candidate thermal spray process to give coatings with appropriate properties is suspension plasma spray (SPS). SPS, which uses a liquid feedstock for the deposition of finely structured columnar ceramic coatings, was investigated in this work for application in light-duty diesel engines. In this work, different spray processes and materials were explored to achieve coatings with optimized microstructure on the head of aluminum pistons used in diesel engine cars. The functional properties of the coatings were evaluated in single-cylinder engine experiments. The influence of thermo-physical properties of the coatings on their functional properties has been discussed. The influence of different spray processes on coating formation on the complex piston head profiles has been also discussed. The results show that SPS can be a promising technique for producing coatings on parts of the combustion chamber, which can possibly lead to higher engine efficiency in light-duty diesel engines. Keywords diesel engines Á fuel efficiency Á microstructure Á suspension plasma spraying Á surface engineering Á thermal barrier coatings & Wellington Uczak de Goes wellington.uczak

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Thermo-Swing Wall Insulation Technology; - A Novel Heat Loss Reduction Approach on Engine Combustion Chamber -

Cited by 41 publications

References 22 publications

Thermal Analysis of Steel and Aluminium Pistons for an HSDI Diesel Engine

Thermal Analysis of Steel and Aluminium Pistons for an HSDI Diesel Engine

The Effect of an Active Thermal Coating on Efficiency and Emissions from a High Speed Direct Injection Diesel Engine

Suspension Plasma-Sprayed Thermal Barrier Coatings for Light-Duty Diesel Engines

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