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29th International Ocean and Polar Engineering Conference, ISOPE 2019

作者： Ji, Guorui Yin, Xiaohui Zhang, Yan Science and Technology on Water Jet Propulsion Laboratory Shanghai China Marine Design & Research Institute of China Shanghai China

ISBN: (纸本)9781880653852

Inlet duct is the main component of water jet unit. Its hydrodynamic performance, especially anti-cavitation performance, has direct effect on the overall performance of water jet device. If the inlet duct is not designed properly, cavitation may occur inside the inlet duct and the bubble will flow into the propeller house, which will not only affect the propeller efficiency but also cause propeller erosion. So it is necessary to do some research on the inlet duct anti-cavitation performance. Generally, the shaft protection tube, anti-singing plate, cathodic anode are set inside inlet duct. Besides, during the manufacturing process of inlet duct, the bending pipe joint is not a circular tube, however it is welded by two straight pipe, which will undoubtedly influence inlet duct anti-cavitation performance. In this paper, CFD method will be adopted to study the relationship between the component layout style, welded bending pipe joint and the inlet duct anti cavitation performance, obtaining the influence law, which can provide reference for inlet duct hydrodynamic design. © 2019 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Cavitation

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Flow-induced vibration analysis of the check valve 25

Flow-induced vibration analysis of the check valve

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25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018

作者： Shuai, Liu Peng, Feng Zhi Zhou, Jiang Xiao Xi, Lv Shou, Zhang Feng Xuan, Huang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9781510868458

As an important over-current adjustment unit in the nuclear power plant piping system, check valve often causes some vibration and noise problems. The study of the existing valves mainly focuses on the simple or fixed opening two-dimensional steady-state flow field, which can't be used to explain the vibration and noise problems. In this paper, a complex passive check valve which has the asymmetric distribution with one import and two exports is proposed. In order to investigate the coupling mechanism between the internal pressure fluctuations and the vibration of system with the automatic adjusting process, the three-dimensional fluid simulation model is constructed. In addition, the vibration characteristic of internal flow field and the irregular fluctuating of the flow field are also calculated when the spool is moving. The coupling vibration characteristics of the flow field is obtained, which provides a meaningful guidance for the vibration reduction of the valve. Copyright © (2018) by International Institute of Acoustics & Vibration. All rights reserved.

关键词： Flow fields

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Research on the effect of grid clamping failure on flow elastic stability and vortex shedding of fuel rod 26

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2018 26th International Conference on Nuclear Engineering, ICONE 2018

作者： Huan-Huan, Qi Zhi-Peng, Feng Nai-Bin, Jiang Qian, Huang Xuan, Huang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9780791851456

Flow elastic stability and vortex shedding were two important mechanisms of the flow induced vibration analysis. Due to the influence of manufacturing process, transportation and irradiation, the clamping action of grid on fuel rods may be invalid. Taking one fuel assemblies as an example, the effects of clamping failure on the natural frequencies, mode shapes, flow elastic stability and vortex shedding were studied. The results show that the effect of the rigid convex support failure on the natural frequency was directly related to the mode shape. The effect of the grid rigid convex failure near the nodes with larger amplitude on the natural frequency was obvious. The velocity of flow at the top and bottom of the fuel rods were larger and the size was comparable, this induced that the rigid convex failure of the top and bottom grids had a significant effect on the ratio of flow elastic stability and the vortex shedding. Copyright © 2018 ASME.

关键词： Vortex shedding

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Sound radiation of shells of revolution with free-form meridian based on data-driven enhanced algorithm

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Thin-Walled Structures 2025年 215卷

作者： Qingyang Huang Lin Wang Huai Cao Yuan Lu Jie Gao Yicang Huang Xiaoqiang Zhou Department of Mechanics School of Aerospace Engineering Huazhong University of Science and Technology Wuhan 430074 PR China Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment Wuhan 430074 PR China School of Mechanical Science & Engineering Huazhong University of Science and Technology WuHan 430074 PR China R&D Center Wuhan Second Ship Design and Research Institute Wuhan 430205 PR China

The fitted-element radiation superposition (f-ERS) method is proposed to analyze the acoustic radiation characteristics of doubly-curved shells of revolution with free-form meridian, based on the data-driven enhanced-generalized differential quadrature method (DE-GDQ). According to the first-order shear deformation theory (FSDT) and DE-GDQ, the free vibration characteristics of doubly-curved shells can be obtained. The point force excitation is introduced according to force discontinuity. Fast and accurate far-field acoustic radiation characteristics results are obtained based on f-ERS. After analyzing and verifying the convergence of DE-GDQ and f-ERS, as well as the applicability of the acoustic field, an in-depth discussion was conducted on the sound radiation characteristics of the structure under different models, types of excitation, positions of observation points and carbon fiber reinforced polymers (CFRP) material mechanical parameters. The study improves the computational efficiency of acoustic radiation and discusses the coupling effects between the shell’s curvature, CFRP parameters and acoustic radiation in detail. It provides a theoretical basis for the design optimization of shells.

关键词： Far-field sound radiation Doubly-curved shell Data driven Generalized differential quadrature Element radiation superposition

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Improving the cycle stability of FeCl3-graphite intercalation compounds by polar Fe2O3 trapping in lithium-ion batteries

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Nano Research 2019年第8期12卷 1836-1844页

作者： Zheng Li Chengzhi Zhang Fei Han Fuquan Zhang Dianwu Zhou Shaohua Xu Hongbo Liu Xuanke Li Jinshui Liu College of Materials Science and Engineering Hunan University Changsha 410082China Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha 410082China

FeCI3-intercalated graphite intercalation compounds (GICs) with high reversible capacity and high volumetric energy density are attractive anode material alternatives of commercial graphite. However, the rapid capacity decay, which was induced by chloride dissolution and shuttling issues, hindered their practical application. To address this problem, here, we introduce flake-like Fe2O3 species with inherently polar surface on the edge of FeCl3 -intercalated GICs through microwave-assisted transformation of a fraction of FeCl3 component. Theoretical simulations and physical/electrochemical studies demonstrate that the introduced Fe2O3 component can afford sufficient polar active sites for chemically bonding the soluble FeCl3 and LiCl species based on the polar-polar interaction mechanism, further inhibiting the outward diffusion of the chlorides and immobilizing them within the GIC material. In a lithium ion cell, the FeCl3 -intercalated GIC with a suitable Fe2O3 content shows remarkably improved cycling stability with a high reversible capacity of 1,041 mAh·g^-1 at a current density of 200 mA·g^-1. Capacity retention of 91 % is achieved at a high current density of 1,000 mA·g^-1 over 300 cycles. This work opens up the new prospect for immobilizing chlorides by introducing inorganic species in GIC for long-cycle electrochemical batteries.

关键词： transition metal chloride graphite intercalation compound polar-polar interaction anode lithium ion battery

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Planning of Truck Platooning for Road-Network Capacitated Vehicle Routing Problem

arXiv

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arXiv 2024年

作者： Hao, Yilang Chen, Zhibin Sun, Xiaotong Tong, Lu Shanghai Key Laboratory of Urban Design and Urban Science NYU Shanghai 567 West Yangsi Road Pudong New District Shanghai200126 China Shanghai Frontiers Science Center of Artificial Intelligence and Deep Learning NYU Shanghai 567 West Yangsi Road Pudong New District Shanghai200126 China Department of Civil and Urban Engineering New York University 6 MetroTech Center BrooklynNY11201 United States Guangzhou China Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong The School of Traffic and Transportation Beijing Jiaotong University No.3 Shangyuan Cun Haidian District Beijing China

Truck platooning, a linking technology of trucks on the highway, has gained enormous attention in recent years due to its benefits in energy and operation cost savings. However, most existing studies on truck platooning limit their focus on particular scenarios that each truck can serve only one customer demand and is thus with a specified origin-destination pair, so only routing and time schedules are taken into account. Nevertheless, in real-world logistics, each truck may need to serve multiple customers located at different places, and the operator managing a fleet of trucks thus has to determine not only the routing and time schedules of each truck but also the set of customers allocated to each truck and their sequence to visit. This is well known as a capacitated vehicle routing problem with time windows (CVRPTW), and considering the application of truck platooning in such a problem entails new modeling frameworks and tailored solution algorithms. In light of this, this study makes the first attempt to optimize the truck platooning plan for a road-network CVRPTW in a way to minimize the total operation cost, including vehicles' fixed dispatch cost and energy cost, while fulfilling all delivery demands within their time window constraints. Specifically, the operation plan will dictate the number of trucks to be dispatched, the set of customers, and the routing and time schedules for each truck. In addition, the modeling framework is constructed based on a road network instead of a traditional customer node graph to better resemble and facilitate the platooning operation. A 3-stage algorithm embedded with a "route-then-schedule" scheme, dynamic programming, and modified insertion heuristic, is developed to solve the proposed model in a timely manner. Numerical experiments are conducted to validate the proposed modeling framework, demonstrate the performance of the proposed solution algorithm, and quantify the benefit brought by the truck platooning technology.

关键词： Dynamic programming

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Investigation on the start-up features of secondary-side passive residual heat removal system 27

Investigation on the start-up features of secondary-side pas...

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27th International Conference on Nuclear Engineering: Nuclear Power Saves the World!, ICONE 2019

作者： Shaodan, Li Yong, Li Yuansheng, Lin Jinlan, Gou Chonghai, Huang Science and Technology on Thermal Energy and Power Laboratory Wuhan Second Ship Design and Research Institute Wuhan Hubei China

ISBN: (纸本)9784888983051

In order to study the start-up characteristics of passive residual heat removal (PRHR) system, a numerical model is established to calculate the transient characteristics of secondary-side PRHR system under station blackout (SBO) accident. The results show that two-phase flow oscillation occurs during the establishment of natural circulation. This is caused by the mismatch between the variation of reactor residual heat power and the PRHR system operation power. In this paper, a thermal energy storage device is introduced to remove the high residual heat power of the reactor at the initial stage of shutdown. The latent thermal storage device using phase change materials (PCMs) as heat storage medium has the advantage of high potential heat storage density and almost constant phase change temperature. This new configuration can eliminate the flow oscillation phenomenon and reduce the maximum pressure of the steam generator. © 2018-2019 by JSME

关键词： Heat storage

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Microwave-Anion-Exchange Route to Spinel Cuco2s4 Nanosheets as Cathode Materials for Magnesium Storage

SSRN

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SSRN 2022年

作者： Wang, Zhitao Chen, Song Wang, Liyuan Gao, Shengbo Li, Miao Li, Hong Zhu, Youqi Shangguan, Enbo Henan Engineering Research Center of Design and Recycle for Advanced Electrochemical Energy Storage Material School of Materials Science and Engineering Henan Normal University Xinxiang453007 China College of Electronics and Information Engineering Shenzhen University Shenzhen518060 China Research Center of Materials Science Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Beijing Institute of Technology Beijing100081 China

Exploring high-performance cathode materials is of great significance for development of rechargeable magnesium batteries. Herein, two-dimensional ultrathin spinel CuCo2S4 nanosheets synthesized via microwave-assisted liquid-phase growth and anion-exchange post-sulfuration method. As a magnesium storage material, the electrochemical behavior of the CuCo2S4 nanosheets is investigated in different voltage ranges. After activated for several cycles in 0.1–2.1 V, the CuCo2S4 nanosheet material can show good electrochemical reversibility between 0.1 and 2.0 V with capacity of 191.4 mAh g−1 (50 mA g−1) and 114.5 mAh g−1 (500 mA g−1). The excellent Mg-storage properties are attributed to the fast kinetics of Mg2+ by the 2D morphology and ternary structure. A conversion reaction of the magnesium ion storage mechanism is confirmed by ex situ X-ray diffraction characterization. The excellent performance of spinel CuCo2S4 nanosheets validates the viability of the multinary strategy and sheds light on the application of 2D material design for cathode research. © 2022, The Authors. All rights reserved.

关键词： Nanosheets

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Climate-Informed Clustering Based Nonstationary Regional Extreme Flood Events Spatio-Temporal Evolution Using Hierarchical Bayesian Modeling

SSRN

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SSRN 2024年

作者： Zeng, Hang Zhou, Yang Liu, Pei Li, Xin Huang, Jiaqi Zhou, Hui Yu, Weihou School of Hydraulic and Environmental Engineering Changsha University of Science and Technology Changsha410114 China Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province Changsha410114 China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha410114 China Power China Zhongnan Engineering Corporation Limited Changsha410014 China College of Hydrology and Water Resources Hohai University Nanjing210098 China Yueyang Institute of Water Resources and Hydropower Survey Planning Design Corporation Limited Yueyang414000 China Hydrology and Water Resources Survey Center of Hunan Province Changsha410008 China

Study region: Xiangjiang River basin, is at the middle and lower Yangtze *** focus: Increasing evidence shows that large-scale climate indices are being linked to the spatio-temporal evolution of extreme flood events in many regions. It is widely recognized that identifying the response of flood risks to climate factors is investigated by nonstationary local hydrological frequency analysis (NLFFA). However, high uncertainty by utilizing NLFFA usually cannot achieve the accuracy for engineering design, creating need for nonstationary regional flood frequency analysis (NRFFA) for reducing uncertainty. This study presents a NRFFA for extreme flood risk under changing environment that is conditioned on the large-scale climate index. The nonstationary regional analysis is developed in a hierarchical Bayesian framework to support partial and full pooling, which can enhance climate-based regionalization skill as well as retain site-specific characteristics. Simultaneously, the modeling structure is designed to consider the spatial dependence across the *** hydrological insights for the region: Regional models for whole basin and climatically homogeneous sub-region respectively, and local models are compared: the regional models exhibit a great benefit with the estimates uncertainty reduction and allows a better quantification of large-scale climate effect on flood extremes. Moreover, the regional partial pooling model for homogeneous sub-region indicate that the regional model can be further improved by considering a prior pooling stations formed by similar significant climate response. © 2024, The Authors. All rights reserved.

关键词： Floods

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Stacking up electron-rich and electron-deficient monolayers to achieve extraordinary mid- to far-infrared excitonic absorption: Interlayer excitons in the C3B/C3N bilayer

arXiv

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arXiv 2022年

作者： Tang, Zhao Cruz, Greis J. Jia, Fanhao Wu, Yabei Xia, Weiyi Zhang, Peihong Department of Physics University at Buffalo State University of New York BuffaloNY14260 United States School of Materials Science and Engineering International Centre of Quantum and Molecular Structures Shanghai University Shanghai200444 China Department of Materials Science and Engineering Guangdong Provincial Key Lab for Computational Science and Materials Design Southern University of Science and Technology Guangdong Shenzhen518055 China Ames Laboratory U.S. Department of Energy Iowa State University AmesIA50011 United States

Our ability to efficiently detect and generate far-infrared (i.e., terahertz) radiation is vital in areas spanning from biomedical imaging to interstellar spectroscopy. Despite decades of intense research, bridging the terahertz gap between electronics and optics remains a major challenge due to the lack of robust materials that can efficiently operate in this frequency range, and two-dimensional (2D) type-II heterostructures may be ideal candidates to fill this gap. Herein, using highly accurate many-body perturbation theory within the GW plus Bethe-Salpeter equation approach, we predict that a type-II heterostructure consisting of an electron rich C3N and an electron deficient C3B monolayers can give rise to extraordinary optical activities in the mid- to far-infrared range. C3N and C3B are two graphene-derived 2D materials that have attracted increasing research attention. Although both C3N and C3B monolayers are moderate gap 2D materials, and they only couple through the rather weak van der Waals interactions, the bilayer heterostructure surprisingly supports extremely bright, low-energy interlayer excitons with large binding energies of 0.2 ~ 0.4 eV, offering an ideal material with interlayer excitonic states for mid-to far-infrared applications at room temperature. We also investigate in detail the properties and formation mechanism of the inter- and intra-layer excitons. Copyright © 2022, The Authors. All rights reserved.

关键词： Excitons

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