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- 저자 : Kuanjun Wang (검색결과 2 건)
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Kuanjun Wang,Hongwei Li,Kanmin Shen,Zhigang Shan,Weida Ni,Liuyuan Zhao,Hongyu Wang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
The interaction between the pipeline and the surrounding soil is a critical factor in thebuckling analysis of the pipeline operating at high temperatures and pressures. The heatingpipeline alters the temperature and induces excess pore pressure in the surrounding soil,which in turn affects the mechanical properties of the soil. Therefore, a comprehensiveunderstanding of the thermo-mechanical response of the soil surrounding the pipeline duringoperation and shutdown is essential. To address this issue, this study developed a temperaturecontrolledpipe model test device that simulates the heating and cooling cycle of the pipe andthe temperature field and pore pressure response of the surrounding kaolin clay. The testresults showed that the soil temperature at the closest location to the pipe (0.1D) reached apeak value of approximately 48.7°C when the pipe was heated from 12.5°C to 55°C. Thepeak temperature decreased with increasing distance, reaching 22.5°C at 0.875D. Heattransfer analysis using ABAQUS software revealed that the influence range of the pipeline onthe soil temperature field during the heating cycle was about 2D. Additionally, a parametricstudy focused on the thermal conductivity (λsoil) of kaolin, and the best-fit value wasdetermined to be 0.6 W/(m·°C). The excess pore pressures were generated in the kaolinsurrounding the pipes during the heating cycle, and negative pore pressures were observedafter cooling cycle. Furthermore, a theoretical solution for calculating the thermally inducedpore pressure was derived, and preliminary verification showed good agreement between thetheoretically computed and experimentally measured results. These findings provide valuableinsights into the thermo-mechanical response of the soil surrounding pipelines duringoperation and shutdown, which can improve the design and safety of oil and gas pipelines.
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Xu Yang,Song Yifang,Tsai Cheng-Ying,Wang Jian,Liu Zhengzheng,Fan Kuanjun,Yang Jinfeng,Meshkov Oleg 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.10
Using strong electromagnetic fields generated by lasers to interact with electrons for precise diagnosis and manipulation of electron beams represents a recent focal point in accelerator technology. This approach surpasses the limitations of conventional RF technology, such as low electric field gradients and timing jitters, effectively enhancing the accuracy of ultrafast electron beam diagnostics and manipulations. As demands for precision continue to rise, the precise diagnosis of crucial parameters of ultrafast electron beams remains challenging. This study delves into the electromagnetic behavior of THz-driven devices and proposes an alloptical method utilizing single-cycle THz radiation to compress and characterize a 3 MeV electron beam. Particle tracking simulations demonstrate an astonishing compression effect, reducing the bunch length from 54.0 fs to 4.3 fs, and achieving sub-femtosecond bunch length measurement resolution. Moreover, when combined with an orthogonal THz streak camera, this method shows even greater potential in multi-bunch scenarios
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