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RISS 인기검색어
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- 저자 : Dongbo Shi (검색결과 3 건)
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Jinxing Li,Dongbo Shi,Guangya Zhu,Yonghui Xie 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
An integrated method combining one-dimensional design and automatic threedimensional optimization is proposed for SCO 2 radial inflow turbines with low specific speed. The optimization of the nozzle and impeller are performed simultaneously. Four optimization algorithms, namely, grey wolf optimizer, elephant herding optimization, genetic algorithm, and simulated annealing algorithm, are integrated with computational fluid dynamics simulation and finite element analysis to improve the turbine efficiency. Two constraints (mass flow variation and maximum stress) are imposed in the optimization process. The results indicate that the grey wolf optimizer is the optimal algorithm. The total-to-static efficiency of the optimal turbine is 89.56 %, which is increased by 3.25 %. Moreover, splitter blades are also investigated and optimized. The maximum total-to-static efficiency of 90.16 % can be obtained by reasonably arranging splitter blades. The proposed method is versatile, nimble, and easy to implement. It can improve the design efficiency and provide a geometric reference for low specific speed SCO 2 turbines.
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Chunyun Hou,Jiangwei Yu,Jin-Rui Ding,Weiqiang Fan,Hongye Bai,Dongbo Xu,Wei-dong Shi 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
The unsatisfactory solar light absorption of WO3 and poor charge separation of BiVO4 are main limits fortheir use in photoelectrochemical (PEC) water oxidation. Coupling WO3 with BiVO4 has been consideredas a feasible way to improve PEC performance by taking complementary advantages of them. In thiswork, we obtained nanoflake-structured WO3 by hydrothermal growth with post-annealing. The effectof process variables on morphology and resultant performance were investigated. Electrodepositiongrowth was utilized to deposit BiVO4 onto WO3 forming WO3/BiVO4 heterojunction thin films. PorousBiVO4 with wormlike morphology was tightly coupled and well-distributed onto WO3 nanoflakes. Theoptimized best-performing WO3/BiVO4 photoanode exhibits higher photocurrent density than that summationof bare WO3 and BiVO4 over entire range of applied potential. This enhancement is mainly attributedto the effective charge separation at WO3/BiVO4 interface, which is confirmed throughelectrochemical impedance spectra (EIS) measurements, respectively. Our work provides a referableapproach for the growth of WO3/BiVO4 heterojunction photoanode with enhanced PEC performance.
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A High-Performance Self-Powered UV Photodetector Based on SnO2 Mesoporous Spheres @ TiO2
Yuewu Huang,Qingjiang Yu,Jinzhong Wang,Xiaochao Li,Yuan Yan,Shiyong Gao,Feifei Shi,Dongbo Wang,Cuiling Yu 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.6
A novel self-powered UV photodetector (UVPD) based on the photoelectrochemical cell (PECC) has been constructed using the TiO2 coated SnO2 mesoporous spheres (SnO2-MS@TiO2). This self-powered UVPD displays a higher photocurrent density compared to the UVPD with the pure SnO2-MS. By means of external quantum efficiency (EQE), UV-vis absorption, and electrochemical impedance measurements, we scrutinize the intrinsic role of the TiO2 coating layer on the photocurrent enhancement. Under UV irradiation, this UVPD exhibits a high on/off ratio of 11519, a fast rise time of 0.007 s and decay time of 0.006 s, together with the excellent visible-blind characteristic and linear optical signal response. The self-powered photodetector is a promising candidate for application in high-sensitivity and high-speed UVPDs.
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