Investigations on ablation for highly-intensified diesel engine piston material

Qin, Zhaoju; Jia, Chuanfa; Zhang, Weizheng; Wang, Lijun

doi:10.1016/j.csite.2018.100371

Cited by 14 publications

(5 citation statements)

References 6 publications

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“…Blasio et al [14] achieved a power density of 70 kw/L by developing a fuel injection system with an injection pressure capable of exceeding 2500 bar. Qin et al [15] studied the degree of ablation of different piston materials and the main reasons for the ablation in highly strengthened engines. The research results of Gugulothu show that compared with the hemispherical combustion chamber, the toroidal combustion chamber improves the air swirl and the brake thermal efficiency and reduces the CO and CH emissions, which is more suitable for highstrengthened diesel engines [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Combustion and Performance of Diesel Engine under High Exhaust Back Pressure

Huang

Liu

et al. 2022

Machines

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The use of exhaust gas recirculation, complex after-treatment systems, advanced technology of high-strength engines, and underwater exhaust will lead to increased diesel exhaust back pressure (EBP). This will increase the residual exhaust gas and the exchange temperature in the cylinder and reduce the fresh air charged in the next cycle. In this work, the effects of two high EBP conditions (10 kPa and 25 kPa) on the performance of medium-speed ship engines under different loads are explored through experiments. The results show that the increase in EBP from 10 kPa to 25 kPa has little effect on the heat release rate, engine power, and engine start-up time. However, it will lead to ignition advance and the maximum pressure rise rate, peak pressure, and exhaust temperature increase. The increase in EBP has a more significant impact on the small valve overlap angle. Because the reduction in the valve overlap angle has led to an increase in the residual exhaust gas, further increases in EBP causes residual exhaust gas effects to be more pronounced. The effect of increasing EBP on fuel consumption depends primarily on which effect of exhaust back pressure on temperature and fresh air intake dominates.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Combustion and Performance of Diesel Engine under High Exhaust Back Pressure

Huang

Liu

et al. 2022

Machines

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“…As for the engine sliding components made of aluminum matrix composites, such as pistons, it is one of the core components of the engine. The main operating conditions are medium and low temperature environment (generally, the operating temperature of the piston is less than 300 °C), which is subjected to huge mechanical loads and thermal loads [ 7 , 8 ]. During the operation process, the increase of wear contact surface temperature leads to the formation of some oxidation products with lubricating properties [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of VN and TiB2-TiCx Reinforcement on Wear Behavior of Al 7075-Based Composites

et al. 2021

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Al 7075 alloy, 15 wt.% VN/7075 composites, and 20 wt.% TiB2-TiCx/7075 composites were prepared by ball milling with subsequent hot-pressing sintering. The microstructure, hardness, and wear properties at room temperature to 200 °C of Al 7075-based composites with different reinforcement phases were discussed. The grain uniformity degree values of 15 wt.% VN/7075 composites and 20 wt.% TiB2-TiCx/7075 composites were 0.25 and 0.13, respectively. The reinforcement phase was uniformly distributed in 15 wt.% VN/7075 composites and 20 wt.% TiB2-TiCx/7075 composites, almost no agglomeration occurred. The order of hardness was 20 wt.% TiB2-TiCx/7075 composites (270.2 HV) > 15 wt.% VN/7075 composites (119.5 HV) > Al 7075 (81.8 HV). At the same temperature, the friction coefficient of 15 wt.% VN/7075 composites was the lowest, while the volume wear rate of 20 wt.% TiB2-TiCx/7075 composites was the lowest. With the increase of temperature, the wear mechanism of Al 7075 changed from spalling wear to oxidation wear and adhesion wear. However, the wear mechanisms of 15 wt.% VN/7075 and 20 wt.% TiB2-TiCx/7075 composites changed from abrasive wear at room temperature to wear mechanism (oxidation wear, abrasive wear, and adhesive wear) at medium and low temperature. Comprehensive wear test results indicated that 20 wt.% TiB2-TiCx/7075 composites had excellent tribological properties at medium and low temperature.

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“…The local strengthening technology is to use a reinforced aluminum matrix composite with high strength in the bowl edge of the piston crown. The application of composite materials increases the strength of the piston at elevated temperatures and then improves greatly the creep resistance of the piston crown [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Elevated Temperature Tensile Creep Behavior of Aluminum Borate Whisker-Reinforced Aluminum Alloy Composites (ABOw/Al–12Si)

Yuan

Zhang

et al. 2021

Materials

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In order to evaluate the elevated temperature creep performance of the ABOw/Al–12Si composite as a prospective piston crown material, the tensile creep behaviors and creep fracture mechanisms have been investigated in the temperatures range from 250 to 400 °C and the stress range from 50 to 230 MPa using a uniaxial tensile creep test. The creep experimental data can be explained by the creep constitutive equation with stress exponents of 4.03–6.02 and an apparent activation energy of 148.75 kJ/mol. The creep resistance of the ABOw/Al–12Si composite is immensely improved by three orders of magnitude, compared with the unreinforced alloy. The analysis of the ABOw/Al–12Si composite creep data revealed that dislocation climb is the main creep deformation mechanism. The values of the threshold stresses are 37.41, 25.85, and 17.36 at elevated temperatures of 300, 350 and 400 °C, respectively. A load transfer model was introduced to interpret the effect of whiskers on the creep rate of this composite. The creep test data are very close to the predicted values of the model. Finally, the fractographs of the specimens were analyzed by Scanning Electron Microscope (SEM), the fracture mechanisms of the composites at different temperatures were investigated. The results showed that the fracture characteristic of the ABOw/Al–12Si composite exhibited a macroscale brittle feature range from 300 to 400 °C, but a microscopically ductile fracture was observed at 400 °C. Additionally, at a low tensile creep temperature (300 °C), the plastic flow capacity of the matrix was poor, and the whisker was easy to crack and fracture. However, during tensile creep at a higher temperature (400 °C), the matrix was so softened that the whiskers were easily pulled out and interfacial debonding appeared.

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Investigations on ablation for highly-intensified diesel engine piston material

Cited by 14 publications

References 6 publications

Experimental Investigation on Combustion and Performance of Diesel Engine under High Exhaust Back Pressure

Experimental Investigation on Combustion and Performance of Diesel Engine under High Exhaust Back Pressure

Effect of VN and TiB2-TiCx Reinforcement on Wear Behavior of Al 7075-Based Composites

Elevated Temperature Tensile Creep Behavior of Aluminum Borate Whisker-Reinforced Aluminum Alloy Composites (ABOw/Al–12Si)

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