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A Wind Tunnel Experimental Study on the Wake Characteristics of a Horizontal Axis Wind Turbine

Journal of Thermal Science 2025年第1期34卷 145-158页

作者： GUO Xingduo li Yinran li Rennian MA Yulong wei Kui College of Energy and Power Engineering Lanzhou University of TechnologyLanzhou 730050China Key Laboratory of Fluid Machinery and Systems Lanzhou 730050China Gansu Provincial Technology Centre for Wind Turbines Lanzhou 730050China

The characteristics of wind turbine wakes are influenced by multiple factors,including the atmospheric boundary layer(ABL)wind and wind turbine operating conditions(e.g.,tip speed ratio and yaw angle).In this study,two types of ABL winds with different velocity gradients and turbulence intensities are generated in a wind tunnel through configurations of spires,baffles,and various numbers of roughness elements.A wind turbine with a rotor diameter of 0.8 m and a hub height of 0.6 m is tested under varying tip speed ratios,yaw angles,and ABL wind *** results indicate that the streamwise velocity deficit in the near-wake region becomes more pronounced with an increase in the tip speed ratio,while the far-wake velocity deficit remains largely unaffected by changes in the tip speed *** the yaw angle increases,the wake deflection becomes more prominent and the wake narrows;the offset of the wake center at various downstream positions grows linearly,reaching a maximum value of approximately half the rotor ***,the turbulence level and influence range in the wake region are reduced when the turbine is *** ABL wind conditions,high turbulence intensity in the incoming flow accelerates wake recovery,and the Reynolds stress at different lateral positions tends to become consistent with increasing longitudinal ***,turbulence has a significant impact on the meandering characteristics of the wind turbine wake,with greater fluctuations in the wake center observed under higher turbulence ***,this study provides insights that could inform the optimal operation of wind farms.

关键词： horizontal axis wind turbine wind tunnel experiment wind turbine wake turbulence

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The Teleconnection between Rainfall over the Northeastern Slope of the Tibetan Plateau and Downstream Regions:Insights from 20 Years of Heavy Rainfall Events

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Advances in Atmospheric Sciences 2025年第2期42卷 327-341页

作者： wei SUN Rucong YU Jian li Zewen li State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China Institute of Tibetan Plateau Meteorology China Meteorological AdministrationChengdu 610072China Department of Atmospheric Science Yunnan UniversityKunming 650091China Inner Mongolia Autonomous Region Mete-orological Service Center Hohhot 010051China

The connection between rainfall over topographic regions and their downstream areas represents a phenomenon of great concern in atmospheric *** on the rainfall events of the past two decades,we analyzed the impact of rainfall over the Northeastern Slope of the Tibetan Plateau(NSTP)on rainfall in downstream *** discovered that rainfall followed two propagation routes,guided by two modes related to the three-dimensional circulation *** the first mode,dominated by cold(warm)anomalies along the west(east)direction,rainfall over the NSTP was concentrated between an upstream cyclonic and a downstream anti-cyclonic anomalous circulation(an upstream trough and a downstream ridge).This pattern was accompanied by upper-level divergence,low-level convergence,a deep moist layer,and a vertical *** a consequence of the eastward movement of the trough-ridge system associated with the coldwarm anomalies,the rainfall over the NSTP moved eastward along 37°-40°N,reaching North China after about 36 *** the second mode,the circulation structure was also dominated by cold-warm anomalies but rotated clockwise,introducing cold anomalies to the northeast and warm anomalies to the east of the *** the southeastward movement of the circulation structure,rainfall concentrated upstream of the anti-cyclonic circulation around the warm center before moving southeastward to the Sichuan Basin along the eastern edge of the plateau after 30-36 *** findings of this study could broaden the understanding of rainfall-related teleconnection between two distant regions and offer helpful guidance for identifying early signals of rainfall disasters over the Chinese mainland.

关键词： teleconnection rainfall propagation three-dimensional circulation structure upper-tropospheric temperature anomaly

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Soil colloids can significantly enhance spreading of polybromodiphenyl ethers in groundwater by serving as an effective carrier

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Journal of Environmental Sciences 2025年第1期147卷 93-100页

作者： lin Duan Min li Jiameng liu wei Chen College of Environmental Science and Engineering Ministry of Education Key Laboratory of Pollution Processes and Environmental CriteriaTianjin Key Laboratory of Environmental Remediation and Pollution ControlNankai UniversityTianjin 300350China

Polybromodiphenyl ethers(PBDEs),the widely used flame retardants,are common contaminants in surface soils at e-waste recycling *** association of PBDEs with soil colloids has been observed,indicating the potential risk to groundwater due to colloid-facilitated ***,the extent to which soil colloidsmay enhance the spreading of PBDEs in groundwater is largely ***,we report the co-transport of decabromodiphenyl ester(BDE-209)and soil colloids in saturated porous *** colloids released froma soil sample collected at an e-waste recycling site in Tianjin,China,contain high concentration of PBDEs,with BDE-209 being the most abundant conger(320±30 mg/kg).The colloids exhibit relatively high mobility in saturated sand columns,under conditions commonly observed in groundwater ***,under all the tested conditions(i.e.,varying flow velocity,pH,ionic species and ionic strength),the mass of eluted BDE-209 correlates linearly with that of eluted soil colloids,even though the mobility of the colloids varies markedly depending on the specific hydrodynamic and solution chemistry conditions ***,the mass of BDE-209 retained in the columns also correlates strongly with themass of retained ***,the PBDEs remain bound to soil colloids during transport in porous *** in this study indicate that soil colloidsmay significantly promote the transport of PBDEs in groundwater by serving as an effective *** might be the reason why the highly insoluble and adsorptive PBDEs are found in groundwater at some PBDE-contaminated sites.

关键词： Polybromodiphenyl ethers Soil colloids E-waste recycling sites Groundwater Facilitated transport

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水滴撞击固体表面实验研究

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大连理工大学学报 2009年第6期49卷 832-836页

作者：权生林李维仲朱卫英大连理工大学能源与动力学院辽宁大连116024

为了研究水滴撞击固体表面的影响因素,利用高速摄影仪记录了水滴撞击不同固体表面的形态变化过程,记录速度为2000f/s.实验是在常温大气环境中进行的,水滴的初始直径固定在(1.8±0.05)mm.对不同材料和不同表面粗糙度的固体表面以及不同... 详细信息

为了研究水滴撞击固体表面的影响因素,利用高速摄影仪记录了水滴撞击不同固体表面的形态变化过程,记录速度为2000f/s.实验是在常温大气环境中进行的,水滴的初始直径固定在(1.8±0.05)mm.对不同材料和不同表面粗糙度的固体表面以及不同撞击角度进行了实验观察,并采用图像处理技术获得不同条件对液滴撞击固体表面行为的影响.实验结果表明:不同固体表面、不同表面粗糙度和撞击角度对液滴撞击固体表面后的润湿行为有非常显著的影响.随着We由50增大到300,液滴撞击在非润湿性表面上会出现部分反弹、反弹甚至飞溅现象;相同固体表面的表面粗糙度增大使撞击过程的接触角变小.

关键词：水滴撞击表面粗糙度撞击角度

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高阶理论对现象性意识的物理主义解释之困难

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江苏行政学院学报 2015年第2期 21-27页

作者：李忠伟华侨大学哲学与社会发展学院福建厦门361021

现象性意识是实实在在的、无法脱离主观视角的体验,且难以从完全客观的视角来理解,由此构成所谓意识之谜。高阶理论试图吸取传统思想资源解决意识问题。该理论认为意识状态在于低阶心理状态为一个与之不同的高阶心理状态所表征,并由此... 详细信息

现象性意识是实实在在的、无法脱离主观视角的体验,且难以从完全客观的视角来理解,由此构成所谓意识之谜。高阶理论试图吸取传统思想资源解决意识问题。该理论认为意识状态在于低阶心理状态为一个与之不同的高阶心理状态所表征,并由此得出意识的个体化条件。此外,该理论还试图对意识给予物理主义的还原性说明。然而,高阶理论及其主要变种都面临诸多困难,更为重要的是,高阶理论对现象性意识进行物理主义的还原性解释是不成功的。物理主义的说明无法处理意识的"跨形而上学场景同质性",而且因为意识是源初的现象,也无法对其给予还原性的说明,而只能如斯特劳森所说,在整体性的阐明中得到理解。

关键词：现象性意识高阶理论物理主义表征

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Residential Energy Scheduling With Solar Energy Based on Dyna Adaptive Dynamic Programming

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IEEE/CAA Journal of Automatica Sinica 2025年第2期12卷 403-413页

作者： Kang Xiong Qinglai wei Hongyang li the Institute of Systems Engineering Macau University of Science and Technology IEEE the State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of Automation Chinese Academy of Sciences the School of Artificial Intelligence University of Chinese Academy of Sciences

Learning-based methods have become mainstream for solving residential energy scheduling problems. In order to improve the learning efficiency of existing methods and increase the utilization of renewable energy, we propose the Dyna actiondependent heuristic dynamic programming(Dyna-ADHDP)method, which incorporates the ideas of learning and planning from the Dyna framework in action-dependent heuristic dynamic programming. This method defines a continuous action space for precise control of an energy storage system and allows online optimization of algorithm performance during the real-time operation of the residential energy model. Meanwhile, the target network is introduced during the training process to make the training smoother and more efficient. We conducted experimental comparisons with the benchmark method using simulated and real data to verify its applicability and performance. The results confirm the method's excellent performance and generalization capabilities, as well as its excellence in increasing renewable energy utilization and extending equipment life.

关键词： Adaptive dynamic programming (ADP) dynamic residential scenarios optimal residential energy management smart grid

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Malignant perivascular epithelioid cell tumor of the colorectum:Clinicopathological characterization,diagnosis and treatment process of 7 cases

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World Journal of Gastrointestinal Oncology 2025年第2期17卷 67-73页

作者： Ming-Fei Ma Zhen-Yu Chi li-Juan Zhao wei Zhai Wen zhong Song Wang Department of Pharmacy The First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003Zhejiang ProvinceChina Department of Surgery People's Hospital of AnjiHuzhou 313300Zhejiang ProvinceChina Department of Colorectal Surgery The First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003Zhejiang ProvinceChina

BACKGROUND Perivascular epithelioid cell tumor(PEComa)of the colorectum is exceedingly rare,with only a few published *** presents with a wide spectrum of biological behavior,ranging from benign to *** prognosis for malignant PEComa is poor and there is little consensus on its *** To fully characterize PEComa and standardize its diagnosis and *** Patients with colorectal malignant PEComa were identified from the First Affiliated Hospital,Zhejiang University School of Medicine and People's Hospital of *** with controversial pathology and cases lost to follow-up were excluded,leaving seven remaining cases that formed the basis of the *** collected relevant clinicopathological,therapeutic and followup *** stage and progression were assessed by contrast-enhanced computed tomography at baseline and at 3-month *** The mean age was 43 years,with a range of 5 years to 73 *** average body mass index was 21.8±3.0 kg/m^(2),and 71.4%of cases occurred in the *** main symptoms of colorectal PEComas were abdominal mass and *** most common microscopic finding of malignant behavior was infiltrative *** analysis found that 6/7 cases were positive for HMB45,5/7 were positive for melan-A,and 3/5 were positive for *** watch-and-wait approach to treatment was a risky *** resection was preferable to systemic *** median progression-free survival exceeded 38 months,longer than previously *** Radical or extended resection is the key to prolonged survival of malignant *** meaningful studies are urgently needed to establish the standardized diagnosis and treatment.

关键词： Perivascular epithelioid cell tumor Colorectum Malignant Resection Mammalian target of rapamycin inhibitor

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Influence of heat treatment on microstructure of a newβ-solidifyingγ-TiAl alloy

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Journal of Iron and Steel Research International 2025年第1期32卷 239-248页

作者： li Quan Xiao-bing li Peng Xue Jun-jie Hao Kun Qian Bo Chen Jian-zhong li Kui liu School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Department of Materials Science and Technology Ji Hua LaboratoryFoshan528200GuangdongChina

The high strength and stability of the full-lamellar structure guarantee the industrial application of theβ-solidifyingγ-TiAl ***,it is a huge challenge to design an alloy with good hot-deformability as well as the full-lamellar *** low-cost Ti-42.5Al-2Mn-0.4Mo-0.1B-0.1C(at.%)alloy was designed,which undergoes bothβandαsingle-phase region during the *** is found that the full-lamellar structure can be obtained by the solution heat treatment at 1230℃ for 20 min and then aging treatment at 800℃ for 3 ***,a new microstructure,namely,the pearlitic-like microstructure(PM)induced by theα_(2)/γ→βo+γcellular reaction was observed when the aging temperature is increased to above 800℃.The volume fraction of the PM is gradually increased from 0%to 25.5%,65%,and 94%according to elevated aging temperature from 800 to 900,1000,and 1050℃,*** mechanism of the reducedα_(2)/γlamellae and PM formation was discussed regarding the heterogeneous distribution ofβstabilizing elements and the interface energy stored inα_(2)/γlamellae.

关键词： β-γ-TiAl Alloy design Two-step heat treatment Full-lamellar structure Cellular reaction

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Residual symmetry and interactions between solitons and periodic waves of the Drinfeld-Sokolov-Satsuma-Hirota system

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Communications in Theoretical Physics 2025年第1期77卷 1-10页

作者： Jie-tong li Jun Yu Xi-zhong liu Institute of Nonlinear Science Shaoxing UniversityShaoxing 312000China

In this paper,the Drinfeld-Sokolov-Satsuma-Hirota(DSSH)system is studied by using residual symmetry and the consistent Riccati expansion(CRE)method,*** residual symmetry of the DSSH system is localized to lie point symmetry in a properly prolonged system,based on which we get a new Bäcklund transformation for this *** symmetry reduction solutions of the DSSH system are obtained by applying the classical lie group approach on the prolonged ***,the DSSH system proves to be CRE integrable and new interesting interaction solutions between solitons and periodic waves are generated and analyzed.

关键词： Drinfeld-Sokolov-Satsuma-Hirota system residual symmetry consistent Riccati expansion

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Numerical Study of Cavitating Flows around a Hydrofoil with Deep Analysis of Vorticity Effects

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Fluid Dynamics & Materials Processing 2025年第1期21卷 179-204页

作者： Shande li Wen’an zhong Shaoxing Yu Hao Wang Xichang Satellite Launch Center Wenchang571300China College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China

This paper aims to numerically explore the characteristics of unsteady cavitating flow around a NACA0015 hydrofoil,with a focus on vorticity *** simulation utilizes a homogeneous mixture model coupled with a filter-based density correction turbulence model and a modified Zwart cavitation *** study investigates the dynamic cavitation features of the thermal fluid around the hydrofoil at various incoming flow *** systematically elucidates the evolution of cavitation and vortex dynamics corresponding to each velocity *** results indicate that with increasing incoming flow velocity,distinct cavitation processes take place in the flow field.

关键词： Cavitating flow hydrofoil flow velocity vorticity Computational Fluid Dynamics(CFD)

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