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- 저자 : Yin Zhenlong (검색결과 2 건)
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Effect of Metallic GPF on the Micro Characteristics of Soot Particles of GDI Engine
Liu Cheng,Ma Zhihao,Yin Zhenlong,Du Weixin,Lv Enyu 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.6
High-resolution transmission electron microscopy (HRTEM) was used to observe the soot particles emitted from gasoline direct injection (GDI) engine equipped with metallic particulate filter (GPF). The changes of microscopic morphology and structure of the soot particles at pre-GPF and post-GPF were studied at a fixed speed of 1500 r/min and 25 %, 50 % 75 % and 100 % load, respectively. Furthermore, the micro-parameters of the primary particles that make up the soot particles were analyzed. The results show that the primary particles are approximately spherical, and agglomerate to form irregular shapes such as chains, branches and rings. The load and GPF have no significant influence on the microscopic morphology of the soot particles, the fractal dimension of soot particles at both ends of the GPF increases with the increase of load. Under the experimental conditions of the engine, most primary particles consisting of the soot particles are “shell-core” structure; The fringe length, tortuosity and interlayer spacing of the primary particles at pre- and post-GPF are monomodal. Among them, the average fringe length increases with the increase of load, while both the average tortuosity and average interlayer spacing change the opposite. These indicated that the degree of graphitization of the soot particle increases with the increasing load. Load and GPF only affect the micro-structure parameters of the primary particles and have no effect on its distribution.
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Hanxiang Liu,Hongwen Jing,Qian Yin,Zhenlong Zhao,Yaoyao Meng,Liang Zhang 대한토목학회 2023 KSCE JOURNAL OF CIVIL ENGINEERING Vol.27 No.2
In this paper, the effects of thermal treatment on the mechanical properties, fracturecharacteristics, and roughness of the fracture surface of granite under the Brazilian splitting testare studied using an electro-hydraulic servo testing machine with an acoustic emission (AE)and digital image correlation (DIC) system. The test results show that: 1) Thermal treatmentdegrades the physical and mechanical properties. Density, P-wave velocity, and peak load ofgranite decrease with the increase in thermal treatment temperature (T). 2) With the increasing T,the fracture pattern changes from “I” type tensile fractures to “Y” type tensile-shear mixedfailure. The DIC results show that the fracture process changes from transient to progressive. 3) AE counts show that granite gradually changes from brittleness to ductility with the increaseof T. Furthermore, the variations in the RA and AF values of the AE events indicate that theincreasing T leads to an increase in shear cracks in granite. After the test, 4) the roughness ofthe fracture surface of the specimen was analyzed using a spatial digitizer. The results showthat thermal treatment significantly improved the fracture surface's asperity height androughness. 5) Scanning electron microscopy (SEM) results revealed that thermal treatmentleads to the generation of micro-cracks in granite and the desquamation of mineral grains,which influences the macro properties of granite.
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