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Power fluctuation and power loss of wind turbines due to wind shear and tower shadow

Binrong WEN, Sha WEI, Kexiang WEI, Wenxian YANG, Zhike PENG, Fulei CHU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3,   Pages 321-332 doi: 10.1007/s11465-017-0434-1

Abstract: This study investigates the effects of wind shear and tower shadow on power output in terms of power fluctuationPower fluctuation and power loss due to wind shear and tower shadow are analyzed by performing theoreticalResults indicate that power fluctuation is mainly caused by tower shadow, whereas power loss is primarily

Keywords： wind turbine     wind shear     tower shadow     power fluctuation     power loss    

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A novel light fluctuation spectrum method for in-line particle sizing

Shouxuan QIN, Xiaoshu CAI, Li MA

Frontiers in Energy 2012, Volume 6, Issue 1,   Pages 89-97 doi: 10.1007/s11708-012-0176-z

Abstract: This paper discusses two problems in in-line particle sizing when using light fluctuation method.

Keywords： measurement     particle size distribution (PSD)     incident light intensity     particle concentration     light fluctuation    

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Anti-erosion elastic coating design based on synchronous fluctuation principle

Guo Yuanjun,Xiao Hualin,Xu Daqing,Li Wenbin

Strategic Study of CAE 2008, Volume 10, Issue 9,   Pages 60-63

Abstract: The condition of realized synchronous fluctuation of elastic coating channel border with the perturbation

Keywords： erosion     boundary layer     elastic channel border     elastic coating     synchronous fluctuation    

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Optimal portfolio design of energy storage devices with financial and physical right market

Frontiers in Energy 2022, Volume 16, Issue 1,   Pages 95-104 doi: 10.1007/s11708-021-0788-2

Abstract: of energy storage and avoid the imbalance of power supply and consumption and the risk of node price fluctuation

Keywords： portfolio     node price fluctuation     transmission right     energy storage right     risk aversion    

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Numerical simulation and analysis of periodically oscillating pressure characteristics of inviscid flow in a rolling pipe

Yan GU, Yonglin JU

Frontiers in Energy 2012, Volume 6, Issue 1,   Pages 21-28 doi: 10.1007/s11708-012-0173-2

Abstract: It is found that the pressure fluctuation of the inviscid flow remains almost constant at different flowThe amplitude of the pressure fluctuation increases with the increasing of the excitated amplitude, andIt is also found that the period of the pressure fluctuation varies with the excitated frequency.

Keywords： pressure fluctuation     rolling     floating production storage and offloading unit for liquefied natural gas    

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A novel high-temperature and high-pressure hydraulic pump based on mononeuron control

Linhui ZHAO, Xin FANG

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 2,   Pages 219-223 doi: 10.1007/s11465-009-0024-y

Abstract: Based on structures and characteristics of traditional hydraulic pumps, this paper proposes a novel high-temperature and high-pressure hydraulic pump (HHHP) that can work under 150°C and 28 MPa to overcome problems of traditional high-temperature plunger pumps. The HHHP is designed with the structure of mechanical division and double cylinder parallel. The control signals of two cylinders are two separate triangle waveforms with 90° phase difference. Because the output waveforms of two cylinders have the same characteristics as the control signals, the HHHP can obtain a stable output after two separate waveforms are superposed. A mononeuron self-adaptive PID control algorithm is also improved by modifying parameters and . Two improved controllers are used to control the two cylinders, respectively, making two displacements of plungers match each other. Therefore, reduced fluctuations and stable pressure output is obtained. Besides simulation, tests on the built prototype test system are carried out to verify the performance of HHHP. Results show that the improved control approach can limit fluctuations to a lower level and the HHHP system attains good outputs under different signal periods and different pressures.

Keywords： mononeuron PID control     hydraulic pump     pressure fluctuation    

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Distribution, characteristics and daily fluctuations of microplastics throughout wastewater treatment plants with mixed domestic–industrial influents in Wuxi City, China

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 1,   Pages 6-6 doi: 10.1007/s11783-021-1440-4

Abstract:

• MPs were analyzed throughout three WWTPs with mixed domestic–industrial influents.

Keywords： Microplastic     Wastewater treatment plant     Mixed domestic-industrial influent     Characteristic     Daily fluctuation    

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Removal of pharmaceutical and personal care products by sequential ultraviolet and ozonation process in a full-scale wastewater treatment plant

Qian SUI, Jun HUANG, Shuguang LU, Shubo DENG, Bin WANG, Wentao ZHAO, Zhaofu QIU, Gang YU

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 1,   Pages 62-68 doi: 10.1007/s11783-013-0518-z

Abstract: Noticeable fluctuation in the removal efficiencies of the same PPCPs was observed in different sampling

Keywords： PPCPs     advanced treatment     ozone     fluctuation     removal contribution    

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Numerical simulation of sudden-expansion two-phase flows with two-scale second-order moment particle turbulence model

ZENG Zhuoxiong, HAN Shoulei, ZHOU Lixing

Frontiers in Energy 2007, Volume 1, Issue 2,   Pages 202-206 doi: 10.1007/s11708-007-0026-6

Abstract: second-order moment particle turbulence model is developed, based on the concept of particle large-scale fluctuationdue to turbulence and particle small-scale fluctuation due to collision.

Keywords： gas-particle     single-scale second-order     large-scale fluctuation     second-order     sudden-expansion    

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Three-dimensional fluorescence spectral characterization of soil dissolved organic matters in the fluctuating water-level zone of Kai County, Three Gorges Reservoir

Fang FANG, Yan YANG, Jinsong GUO, Hong ZHOU, Chuan FU, Zhe LI

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 3,   Pages 426-434 doi: 10.1007/s11783-010-0264-4

Abstract: to investigate the fluorescent properties of soil dissolved organic matter (DOM) in the water-level-fluctuation

Keywords： water-level-fluctuation zone (WLFZ)     soil     dissolved organic matter (DOM)     three-dimensional fluorescence    

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Title Author Date Type Operation

Power fluctuation and power loss of wind turbines due to wind shear and tower shadow

Binrong WEN, Sha WEI, Kexiang WEI, Wenxian YANG, Zhike PENG, Fulei CHU

Journal Article

A novel light fluctuation spectrum method for in-line particle sizing

Shouxuan QIN, Xiaoshu CAI, Li MA

Journal Article

Anti-erosion elastic coating design based on synchronous fluctuation principle

Guo Yuanjun,Xiao Hualin,Xu Daqing,Li Wenbin

Journal Article

Optimal portfolio design of energy storage devices with financial and physical right market

Journal Article

Numerical simulation and analysis of periodically oscillating pressure characteristics of inviscid flow in a rolling pipe

Yan GU, Yonglin JU

Journal Article

A novel high-temperature and high-pressure hydraulic pump based on mononeuron control

Linhui ZHAO, Xin FANG

Journal Article

Distribution, characteristics and daily fluctuations of microplastics throughout wastewater treatment plants with mixed domestic–industrial influents in Wuxi City, China

Journal Article

Removal of pharmaceutical and personal care products by sequential ultraviolet and ozonation process in a full-scale wastewater treatment plant

Qian SUI, Jun HUANG, Shuguang LU, Shubo DENG, Bin WANG, Wentao ZHAO, Zhaofu QIU, Gang YU

Journal Article

Numerical simulation of sudden-expansion two-phase flows with two-scale second-order moment particle turbulence model

ZENG Zhuoxiong, HAN Shoulei, ZHOU Lixing

Journal Article

Three-dimensional fluorescence spectral characterization of soil dissolved organic matters in the fluctuating water-level zone of Kai County, Three Gorges Reservoir

Fang FANG, Yan YANG, Jinsong GUO, Hong ZHOU, Chuan FU, Zhe LI

Journal Article