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Research on the Influence of Helical Strakes on Dynamic Response of Floating Wind Turbine Platform

China Ocean engineering 2017年第2期31卷 131-140页

作者： DING Qin-wei LI Chun School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai 200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093 China

The stability of platform structure is the paramount guarantee of the safe operation of the offshore floating wind turbine. The NREL 5MW floating wind turbine is established based on the OC3-Hywind Spar Buoy platform with the supplement of helical strakes for the purpose to analyze the impact of helical strakes on the dynamic response of the floating wind turbine Spar platform. The dynamic response of floating wind turbine Spar platform under wind, wave and current loading from the impact of number, height and pitch ratio of the helical strakes is analysed by the radiation and diffraction theory, the finite element method and orthogonal design method. The result reveals that the helical strakes can effectively inhibit the dynamic response of the platform but enlarge the wave exciting force; the best parameter combination is two pieces of helical strakes with the height of 15%D （D is the diameter of the platform） and the pitch ratio of 5; the height of the helical strake and its pitch ratio have significant influence on pitch response.

关键词： floating wind turbine platform helical strakes orthogonal design

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Investigation on aerodynamic performance of vertical axis wind turbine with different series airfoil shapes

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RENEWABLE ENERGY 2018年 126卷 801-818页

作者： Wang, Ying Shen, Sheng Li, Gaohui Huang, Diangui Zheng, Zhongquan Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Univ Newcastle Newcastle Inst Energy & Resources Ctr Bulk Solids & Particulate Technol Callaghan NSW Australia

Numerical research for vertical axis wind turbine with different thicknesses or different cambers of airfoils was conducted in this paper. By comparing with the experiment results, the simulation results were validated. power coefficients under different tip speed ratios were calculated and compared for different types of airfoils: symmetrical airfoils with same maximum thickness position, but different maximum thicknesses;C) symmetrical airfoils with same maximum thickness, but different maximum thickness positions;C) non-symmetrical airfoils with same maximum thickness, same maximum thickness position, same maximum camber position, but different maximum cambers;non symmetrical airfoils with same maximum thickness, same maximum thickness position, same maximum camber, but different maximum camber positions. It was found that power coefficient of VAWT showed tendency at first increase and then decrease with the increase of tip speed ratio for symmetrical airfoils with same maximum thickness and same maximum thickness position. Moreover, when the maximum thickness position moved from the leading edge to trailing edge, the power coefficient firstly increased and then decreased for symmetrical airfoils with the same maximum thickness but different maximum thickness positions. Besides, with the rise of areas enclosed by curves of surface pressure coefficient when the azimuthal position increases from 0 to 90, there showed much larger work capability. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： vertical axis wind turbine different airfoil shapes wind energy aerodynamic performance numerical simulation

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Lattice Boltzmann simulation of the spreading behavior of a droplet impacting on inclined solid wall

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JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 2018年第6期32卷 2637-2649页

作者： Chen, Wanyu Yang, Fan Yan, Yonghua Guo, Xueyan Dai, Ren Cai, Xiaoshu Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Jackson State Univ Dept Math & Stat Sci Jackson MS 39217 USA

The spreading behavior of a 3D droplet impacting on inclined solid wall is presented by using a lattice Boltzmann method (LBM) with single component multiphase pseudopotential model. The time evolution of spreading factor, dimensionless spreading width, dimensionless height, dimensionless bottom area and adhesion force are obtained. Our numerical results show that when increasing the contact angle or inclination angle, the dimensionless height and the dimensionless bottom area increases but the dimensionless spreading length and spreading width decreases. In addition, the progresses of circumferential spreading in starting-up and spreading stages and the aggregation at front edge in retracting stage would be more obvious by decreasing the viscosity or increasing the Bond number.

关键词： Droplet Inclined solid wall Single component lattice Boltzmann method Spreading behavior

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Effects of trailing-edge movable flap on aerodynamic performance and noise characteristics of VAWT

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ENERGY 2019年 189卷

作者： Liu, Qingsong Miao, Weipao Li, Chun Hao, Winxing Zhu, Haitian Deng, Yunhe Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Shenzhen Yatu New Energy Technol Co Ltd Shenzhen 518000 Peoples R China

Efficiency enhancement and noise reduction are the two critical factors in the wind turbine design. In this paper, the effects of trailing-edge flap on the aerodynamic performance and noise characteristics of NACA0018 airfoil and vertical axis wind turbine (VAWT) were investigated, and the geometric parameters including flap angle, flap position and flap length were considered. The aerodynamic performance was simulated with the Detached-Eddy Simulation (DES) based on Spalart-Allmaras turbulence model and noise characteristics is calculated by CFD combined with Ffowcs-Williams and Hawkings (FW-H) acoustic analogy method. The research results indicate that the trailing-edge flap could effectively suppress flow separation and reduce the airfoil noise at high angle of attack (AOA). The optimum flap parameters obtained by orthogonal experimental design (OED) method were applied in VAWT, and it was observed that the trailing-edge flap could significantly improve the power coefficient at high tip-speed ratio (TSR) and reduce the VAWT noise. The research in this paper provided a comprehensive reference for improving the dynamic stall characteristics and reducing the noise of VAWT in practical engineering applications. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： CFD Trailing-edge flap flow separation Aerodynamic performance Noise VAWT

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The analysis of anti-collision performance of the fender with offshore wind turbine tripod impacted by ship and the coefficient of restitution

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OCEAN engineering 2019年 194卷 106614-000页

作者： Han, Zhiwei Li, Chun Deng, Yunhe Liu, Jihong Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Shenzhen Yatu New Energy Technol Co Ltd Shenzhen 518000 Guangdong Peoples R China

Offshore wind turbine tripod as one of the important foundation type is widely used. So its security and stabilization for the marine environment and even life safety must be guaranteed by the fender during the collision. The four types of fenders are proposed by two materials, which are combined in different orders and adopted alone. Base on this, the study is devoted to probe and compare the anti-collision performance of the fender when 2500 tons ship-tripod collision. A series of cases are conducted to investigate the fender of tripod damage analysis and the dynamic response of OWT under the protection of the fender by ANSYS LS-DYNA. Through investigating and analyzing the maximum collision force, energy absorbed, the maximum bending moment of the fender, Von Mises stress, plastic strain, thickness of material layer and ship. It is found that the aluminum foam fender has better anti-collision performance and the thickness of the material layer has an impact on the anti-collision performance of fender. Moreover, the coefficient of restitution (COR) is discussed during the fender service period. Hence, the aluminum foam material is good for improving the fender's performance, which can give valuable information to further study on the application of aluminum foam in the fenders.

关键词： Offshore wind turbine Structural dynamic response Tripod Fender COR

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Front Cover: Decoupled Water Electrolysis Driven by 1 cm2Single Perovskite Solar Cell Yielding a Solar-to-Hydrogen Efficiency of 14.4 % (ChemSusChem 1/2023)

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ChemSusChem 2022年第1期16卷

作者： Fei Lv Dr. Zhixiao Qin Jiazhe Wu Lixia Pan Longjie Liu Prof. Yubin Chen Prof. Yixin Zhao International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi 710049 P. R. China School of Environmental Science and Engineering Frontiers Science Center for Transformative Molecules Shanghai Jiao Tong University Shanghai 200240 P. R. China

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Effect of Guide Vanes on flow and Vibroacoustic in an Axial-flow Pump

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MATHEMATICAL PROBLEMS IN engineering 2018年第1期2018卷 1-11页

作者： Li, Guoping Chen, Eryun Yang, Ailing Xie, Zhibin Zhao, Gaiping Shanghai Marine Equipment Res Inst Shanghai 200031 Peoples R China Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Sch Med Instruments & Food Engn Shanghai 200093 Peoples R China

An effect of guide-vane numbers on pressure fluctuations and structural vibroacoustics induced by unsteady flow is performed by a hybrid numerical method. A 3D flow field is simulated in axial-flow pump with four impeller blades, in which three diffuser models with 5, 7, and 9 vanes are devised to match, respectively. A full scale structural vibroacoustics coupled model is solved using LMS acoustics software. The results show that the blade-passing frequency (BPF) is dominated frequency of the vibration acceleration of pump, which is consistent with frequency spectral characteristics of pressure pulsation. The unsteady pressure fluctuating becomes strong as the flow discharge decreases from 1.0Qv to 0.6Qv, the circumferential unsteady behavior of which is more severe due to flow nonuniformity induced by the suction elbow at partial operation. Generally, the pressure fluctuating increases slightly when the flow discharge increases from 1.0Qv to 1.3Qv. Moreover, pressure fluctuations amplitude on the pump with 9-vane diffuser is small relative to other two models and the vibrating accelerating and radiation sound field at BPF are also slight relatively, which indicates that appropriate guide-vane numbers contribute to suppress pressure fluctuations and vibroacoustics in axial-flow pwnp. 'I he conclusions in the present paper can provide theoretical guidance for low vibration pump design.

关键词： Acoustic fields

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An open-path dual-beam laser spectrometer for path-integrated urban NO2 sensing

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SENSORS AND ACTUATORS A-PHYSICAL 2020年 315卷 112208-112208页

作者： Chen, Jun Wang, Dan-Na Ramachandran, Arun Chandran, Satheesh Li, Mingzhi Varma, Ravi Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Natl Inst Technol Calicut Dept Phys Appl Opt & Instrumentat Lab Calicut 673601 Kerala India Optind Solut Private Ltd Technol Business Incubator Natl Inst Technol Calicut Unit 11 Calicut 673601 Kerala India Natl Univ Ireland Univ Coll Cork Phys Dept Cork Ireland Natl Univ Ireland Univ Coll Cork Environm Res Inst Cork Ireland

Fast and continuous in-situ monitoring of NO2 in urban air using optical sensing has been a topic of research recently. Due to possible interferences from other absorbers, spectroscopic measurements across a broad absorption band of NO2 are preferred over single-wavelength laser absorption measure-ments for specificity. While, in general, broadband spectrometers account for spectral interferences and exhibit high selectivity, laser spectrometers possess faster responses and higher sensitivity. In this study, we present an open-path and dual-beam laser absorption spectrometer (OP-DBLS) featured as sensitive, accurate and cost-effective urban NO2 monitor with fast and easy operation. This instrument consists of two lasers operating at wavelengths close to the NO2 absorption peak around 405 nm and the ratio of absorption at these wavelengths were used to remove cumulative influence of all broad baseline features such as aerosol interferences. The instrument was continuously operated for thirteen days at the middle ring road monitoring centre located in the northeast of shanghai, P. R. China. The measurements were compared with concurrent measurements by a Chemiluminescence (CL) detector and the correlation of campaign-averaged hourly measurements depicting diurnal variations in NO2 concentrations was found to be similar to 0.8. Furthermore, results from comparison against four other air quality monitors deployed elsewhere in the city showed excellent consistency. (c) 2020 Elsevier B.V. All rights reserved.

关键词： Laser spectrometer Nitrogen dioxide Path-integrated measurement Open-path sensor Urban atmosphere Air pollution

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Optimization Design of Axial Fan Blade

Optimization Design of Axial Fan Blade

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第三届中国国际透平机械学术会议

作者： Yu-jing Wu Dian-gui Huang School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai Key Laboratory of Power Energy in Multiphase Flow and Heat Transfer

An airfoil series consisting of 8 airfoils are obtained through the optimization design method which aimed to the lift drag *** new airfoil serie is used to construct the blade,the chord length and installation angle of the blade along the blade height are optimized by using orthogonal optimization method,meanwhile,three design options of straight blades,C-type blades and forward swept blade are provided in this *** a axial fan as the research object,the whole 3D numerical simulation was conducted by using *** axial fans with three kinds of blades are respectively discussed and compared under design and off-design *** show that under design conditions,the full pressure efficiency of the axial flow fan with the forward swept blade is the highest,and the C-type blade has slightly lower efficiency and the straight blade has the lowest *** off-design conditions,the aerodynamic performance of the forward-swept balde and C-type blade fans are better than that of the straightblade fans.

关键词： Axial Fan Forward Swept Blade C-type Blade 3D Design

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Emission and conversion of NO from algal biomass combustion in O2/CO2 atmosphere

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JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019年 250卷 109419-000页

作者： Zhao, Bingtao Su, Yaxin Univ Shanghai Sci & Technol Sch Energy & Power Engn 516 Jungong Rd Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer 516 Jungong Rd Shanghai 200093 Peoples R China Donghua Univ Sch Environm Sci & Engn 2999 North Renmin Rd Shanghai 201620 Peoples R China

Environmental impacts of NO emissions from biomass combustion have become an important concern. To address NO emission and conversion from algal biomass combustion in O-2/CO2 atmosphere, three typical algal biomass, Chlorella (Ch), Enteromorpha (En), and Sargassum (Sa), were used to investigate NO emission characteristics in a one-dimensional tube furnace. The effects of the combustion temperature and O-2 concentration (21%, 25%, and 30%) on the NO emission were examined. It was found that the main peaks of NO positively are correlated to the O-2 concentration and combustion temperature. The NO emission trends of each algal biomass are slightly affected by the( )O(2) concentration at a given temperature. Roughly, the NO yield and conversion rate for each algal biomass increase with increasing O concentration at a given temperature. They first increase with the increasing temperature and then decrease beyond 800 degrees C with exception for Sa in 30% O-2/CO2 atmosphere. However, 21% O-2/CO2 atmosphere is at least effective to reduce NO emission from most algal biomass combustion compared to air-based atmosphere (21% O-2/N-2), by 8.2-62.0%, 4.9-45.6%, and 22.5-59.6% for Ch, En, and Sa, respectively. The possible conversion pathway of fuel-N implies that the NO emission from algal biomass combustion in O-2 /CO2 atmosphere is the result of the combined effect of the NO formation oxidized from N-precursors and NO reduction by CO (converted from CO2) and other reductive components. These results may provide a positive reference for the control of NOx emissions from direct combustion or co-firing of algal biomass for energy utilization.

关键词： O-2/CO2 atmosphere Algal biomass Direct combustion NO Emission and conversion

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