Cold Regions Science and Technology最新文献_第4页

A laboratory-based spectrometer intercomparison for the measurement of snow spectra 基于实验室的雪光谱测量光谱仪比对

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-12-22 DOI: 10.1016/j.coldregions.2025.104800

Benjamin M. Roberts-Pierel , Christopher J. Crawford , Steven W. Brown , Raymond F. Kokaly , Kelly E. Gleason , Anne W. Nolin , Edward H. Bair , Brenton A. Wilder , Anton J. Surunis , S. McKenzie K. Skiles , Joachim Meyer , Allyson E. Fitts , Jeremy M. Johnston , Adam G. Hunsaker , Martin Stuefer , Trond Løke

Seasonal snow is an integral component of global hydrological systems, global energy budget and Earth's climate. As an important part of many Earth systems, seasonal snow is also an essential source of water for many human populations and ecosystems around the world. As such, the measurement of seasonal snow and characterization of uncertainty in those measurements is crucial. To elucidate potential uncertainty attributable to commonly used field spectrometers (and to a lesser extent imaging spectrometers) and associated reference panels, this work presents results from an intercalibration experiment conducted synchronously with the NASA 2023 Snow Experiment (SnowEx) Albedo campaign near Fairbanks, Alaska USA. Three sets of experiments were carried out under controlled laboratory conditions to characterize the radiometric and spectral wavelength consistency of the instruments as well as the white reference panels used to calculate reflectance from field measurements. Although there was generally good agreement between the instruments, panels, and the references, there were also some notable differences. One instrument showed an average − 74 % change from the reference for radiance, and multiple instruments exceeded the suggested 0.5 nm threshold for spectral wavelength scale. The Discussion section highlights how some of these findings and their implications could improve future field campaigns and general use/maintenance of these high-precision scientific instruments.

季节性降雪是全球水文系统、全球能源收支和地球气候的重要组成部分。作为许多地球系统的重要组成部分，季节性雪也是世界各地许多人口和生态系统的重要水源。因此，季节性降雪的测量和这些测量中的不确定性的表征是至关重要的。为了阐明常用的野外光谱仪（以及较小程度上的成像光谱仪）和相关参考面板的潜在不确定性，本工作介绍了与美国阿拉斯加州费尔班克斯附近的NASA 2023雪实验（SnowEx）反照率运动同步进行的相互校准实验的结果。在受控的实验室条件下进行了三组实验，以表征仪器的辐射和光谱波长一致性，以及用于计算现场测量反射率的白色参考板。虽然在文书、小组和参考文献之间普遍存在良好的一致性，但也存在一些显著的差异。一台仪器的辐射值比参考值平均变化了- 74%，多台仪器的光谱波长范围超过了建议的0.5 nm阈值。讨论部分强调了这些发现及其影响如何能够改善未来的实地活动和这些高精度科学仪器的一般使用/维护。

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引用次数: 0

Blade icing characteristics and dynamic response analysis of floating offshore wind turbine in cold marine environments 海洋寒冷环境下浮式海上风力机叶片结冰特性及动力响应分析

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-12-19 DOI: 10.1016/j.coldregions.2025.104796

Haojie Zheng , Siming Zheng , Yang Yang , Koushik Kanti Barman , Gregorio Iglesias

Floating offshore wind turbines (FOWTs) operating in cold marine environments must confront atmospheric icing. The objective of this work is to study the blade icing characteristics in operation and the dynamic response of FOWT after icing. For this purpose, blade icing is simulated under various operating conditions using the IEA Wind 15 MW reference wind turbine as an exemplar. The Computational Fluid Dynamics (CFD) methodology calculates the aerodynamic performance of the icing airfoil. A fully coupled dynamic analysis of the wind turbine is performed in OpenFAST to assess the response of the FOWT after blade icing. The calculation results indicate that the wind turbine’s operating regions significantly impact ice accretion. Blade icing reduces the aerodynamic performance, leading to power generation loss. The maximum lift coefficient at the blade tip decreases by 17.7%. The power generation loss in Region 2 is approximately 6%, and the maximum power loss of 0.87 MW occurs at 11 m

/

s. Due to different control strategies, the wind turbine response caused by blade icing manifests differently before and after the rated wind speed. When exceeding the rated wind speed, the reduction of pitch angle caused by blade icing, which decreases by 25.6% at 11 m/s, may lead to structural overload. Under imbalanced icing, the power generation of the wind turbine exhibits fluctuations. This study provides a reference for evaluating FOWTs in cold marine environments regarding power generation and safety under atmospheric icing conditions.

在寒冷的海洋环境中运行的浮式海上风力涡轮机（FOWTs）必须面对大气结冰问题。本文的目的是研究叶片在运行中的结冰特性和结冰后的动力响应。为此，以IEA Wind 15mw参考风力机为例，在各种工况下对叶片结冰进行了模拟。计算流体动力学（CFD）方法计算了结冰翼型的气动性能。在OpenFAST中对风力机进行了全耦合动力学分析，以评估叶片结冰后的FOWT响应。计算结果表明，风机的运行区域对冰积影响较大。叶片结冰降低了气动性能，导致发电损失。叶尖最大升力系数降低了17.7%。区域2的发电损失约为6%，11 m/s时的最大损失为0.87 MW。由于控制策略的不同，叶片结冰引起的风力机响应在额定风速前后表现不同。当超过额定风速时，叶片结冰导致的俯仰角减小，在11 m/s时减小了25.6%，可能导致结构过载。在不平衡结冰情况下，风力发电机组的发电量会出现波动。该研究为海洋低温环境下风力发电机组的发电性能和大气结冰条件下的安全性评估提供了参考。

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引用次数: 0

Wind tunnel test of non-uniform snow distribution on large-span suspended gable roofs with snow fences 雪栅大跨度悬架山墙不均匀雪分布风洞试验

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-12-18 DOI: 10.1016/j.coldregions.2025.104797

Jianshuo Wang , Aoyou Liu , Junxiang Zhao , Zhihua Chen , Ningning Hong , Xizhi Zhang , Li Jia , Julita Krassowska

Frequent extreme weather events, involving high winds and heavy snowfalls, lead to many accidents. Large-span suspended gable roof structures are used in certain geological and geomorphological protection zones and archaeological and cultural relic excavation sites, etc., which are characterized by weak foundations, light dead weight, large flexibility and strong sensitivity to snow accumulation. Under heavy snowfall, local or overall load changes on these roofs easily create safety hazards. Therefore, this paper conducted wind tunnel tests to study snow distribution on the large-span suspended gable roofs with snow fences. The research investigated snow distribution under varying snowfall conditions, wind speeds, and wind directions. The study found that snow accumulation on the roof forms characteristic deposition zones under different wind directions, exhibiting distinct patterns during both snowfall and snow erosion deposition. As wind speed increases, the peak snow accumulation point moves toward the roof ridge. Subsequent tests on roof models with snow fences of different heights showed that the 20 mm high snow fence resulted in more uniform snow distribution and smoother contour changes under both snowfall and snow erosion conditions. Under snow erosion conditions, compared to a roof without snow fences, the snow fence significantly reduced snow erosion across different wind directions, leading to uniform snow distribution. This enhances the overall structural stability, preventing collapse caused by local instability. The study demonstrates that roof snow fences benefit uniform snow distribution and provides a test basis for the anti-snow design of similar future projects.

频繁的极端天气事件，包括大风和大雪，导致许多事故。大跨度悬吊式山墙屋面结构应用于某些地质地貌保护区、考古文物发掘现场等，具有基础薄弱、自重轻、柔韧性大、对积雪敏感性强等特点。在大雪下，这些屋顶的局部或整体负荷变化很容易造成安全隐患。为此，本文通过风洞试验研究了大跨度带雪栅栏的悬架山墙屋面的雪分布。该研究调查了不同降雪条件、风速和风向下的雪分布。研究发现，屋面积雪在不同风向下形成特征沉积带，在降雪和雪蚀沉积过程中均表现出不同的模式。随着风速的增大，高峰积雪点向屋脊移动。随后对不同高度雪栅栏屋顶模型的试验表明，在降雪和雪侵蚀条件下，20 mm高雪栅栏的雪分布更均匀，轮廓变化更平滑。在雪蚀条件下，与没有雪栅栏的屋顶相比，雪栅栏在不同风向上显著减少了雪蚀，导致雪分布均匀。这提高了整体结构的稳定性，防止了局部失稳引起的倒塌。研究表明，屋面雪栅栏有利于积雪均匀分布，为今后类似工程的防雪设计提供试验依据。

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引用次数: 0

Shear creep behavior at steel pile–frozen clay and pile–ice interfaces and its nonlinear constitutive model 钢桩-冻土和桩-冰界面剪切蠕变特性及其非线性本构模型

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-12-18 DOI: 10.1016/j.coldregions.2025.104794

Botong Wang , Qiang Gao , Zhiwei Zhou , Zhi Wen , Mikhal Zhelezniak

In permafrost regions, ice-rich permafrost and massive ground ice occur widely beneath the active layer. Shear behavior at the pile–frozen soil and pile–ice interfaces critically governs the long-term deformation of pile foundations during thaw-induced degradation. During thermal fluctuations and complex loading, this interface exhibits temperature-dependent mechanical behavior with pronounced nonlinearity. This study examines creep behavior at the steel pile-frozen clay interface, under varying stress-temperature conditions, using graded loading-unloading shear creep tests. Experimental results are compared with previous steel pile-ice interface tests, revealing similarities and differences in shear creep behavior between steel pile-frozen clay and steel pile-ice interfaces. A viscoelastic-plastic model is proposed based on test data, combining an instantaneous elastic element and a double Kelvin unit in series. The evolution of key parameters is analyzed with respect to stress and temperature dependence, including G₀ (instantaneous elastic modulus), η₃ (viscoplastic viscosity coefficient), and n (exponent of the viscoplastic creep curve shape). Results show markedly higher instantaneous plastic deformation at the steel pile-frozen clay interface than at the steel pile-ice interface. Model parameters vary nonlinearly with graded shear stress, and G₀ increases with graded shear stress following a power-law relationship for both interfaces. At −1 °C, η₃ remains near-constant during graded loading, while at lower temperatures, η₃ first increases then decreases with load, more markedly at the steel pile-frozen clay interface. The exponent n increases continuously with stress for both interfaces, showing consistently higher values at the steel pile-ice interface. Mechanical properties enhance at lower temperatures for both interfaces. These results provide guidance for designing and optimizing pile foundations in cold regions.

在永久冻土区，富含冰的永久冻土带和大量的地面冰广泛分布在活动层之下。在融化退化过程中，桩-冻土和桩-冰界面处的剪切行为对桩基的长期变形起着关键的控制作用。在热波动和复杂载荷下，该界面表现出具有明显非线性的温度依赖力学行为。本研究采用分级加载-卸载剪切蠕变试验，研究了不同应力-温度条件下钢桩-冻结粘土界面的蠕变行为。将试验结果与以往的钢桩-冰界面试验结果进行了比较，揭示了钢桩-冻土和钢桩-冰界面剪切蠕变特性的异同。基于试验数据，将瞬时弹性单元与双开尔文单元串联，提出了粘弹塑性模型。分析了关键参数G0（瞬时弹性模量）、η3（粘塑性黏度系数）和n（粘塑性蠕变曲线形状指数）在应力和温度依赖关系下的演化规律。结果表明：钢桩-冻土界面处的瞬时塑性变形明显大于钢桩-冰界面处的瞬时塑性变形。模型参数随梯度剪应力呈非线性变化，G0随梯度剪应力呈幂律关系增大。在- 1℃时，η3在分级加载过程中基本保持不变，而在较低温度下，η3随加载先增大后减小，且在钢桩-冻结粘土界面处更为明显。两界面的n指数均随应力的增加而不断增大，且在钢桩-冰界面处n值始终较高。在较低温度下，两种界面的机械性能都有所提高。研究结果对寒区桩基的设计与优化具有指导意义。

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引用次数: 0

Experimental investigation and calculation prediction model of frost heave-induced pressure in sand under lateral constraint freezing condition 横向约束冻结条件下砂土冻胀压力试验研究及计算预测模型

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-12-18 DOI: 10.1016/j.coldregions.2025.104798

Xiangtian Xu , Jingjie Bai , Yongtao Wang , Qing Wang , Jiwei Wang , Yuhang Liu

Rapid in-situ freezing tests were conducted using a self-developed soil frost heave-induced pressure (FHIP) testing system on sandy soil with varying initial saturations and target freezing temperatures under lateral rigid constraints. The temperature evolution and the FHIP development at the sidewall and center of cubic soil specimens were continuously monitored and analyzed. The results indicate that FHIP development proceeds through four distinct stages: pre-cooling, sidewall FHIP rapid growth, center FHIP rapid growth, and subsequent decline. Both the initial saturation and the target freezing temperature strongly affect FHIP, whereby higher initial saturation and lower target freezing temperature produce higher peak and stable FHIP values. Microscopic analyses reveal that in unsaturated soils, in-situ frost heave involves the synergistic separation and embedding of soil particles, accompanied by continuous particle rearrangement from the onset of FHIP generation to its stabilization. Prediction models for both the maximum and stable FHIP, incorporating initial saturation and freezing rate, were established and shown to reproduce the experimental results with high accuracy. This study presents a novel testing methodology and calculational framework for in-situ frost heave and FHIP in soils, offering valuable insights for analyzing frost-damage mechanisms in cold-region foundations and for the design of frost-resistant structures.

采用自行研制的冻土冻胀压力（FHIP）试验系统，对具有不同初始饱和度和目标冻结温度的砂土进行了横向刚性约束的快速原位冻结试验。连续监测和分析了立方体土样侧壁和中心的温度变化和FHIP发展情况。结果表明，FHIP的发展经历了预冷、侧壁FHIP快速增长、中心FHIP快速增长和随后的下降四个阶段。初始饱和度和目标冻结温度都对FHIP有强烈的影响，初始饱和度越高，目标冻结温度越低，FHIP峰值越高且稳定。微观分析表明，在非饱和土中，原位冻胀涉及土体颗粒的协同分离和嵌入，伴随着从FHIP产生开始到稳定的连续颗粒重排。建立了包含初始饱和度和冻结速率的最大和稳定FHIP预测模型，并证明该模型能够高精度地再现实验结果。本研究提出了一种新的土中原位冻胀和FHIP的测试方法和计算框架，为分析寒冷地区基础的冻胀机制和抗冻结构的设计提供了有价值的见解。

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引用次数: 0

Hydromechanical analysis of shear behaviors of sandstone with ice-filled fractures 含冰裂隙砂岩剪切特性的水力学分析

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-12-18 DOI: 10.1016/j.coldregions.2025.104799

Wei Tang , Guangbo Chen , Junwen Zhang , Tan Li , Qing Ma , Eryu Wang , Huiqiang Duan , Chuangye Wang , Yejiao Liu , Guohua Zhang

Rock masses in high-altitude and extremely cold regions are generally characterized by ice-filled fractures, pores, and joints, which are prone to deterioration and instability under dynamic disturbances. To investigate the effects of ice-filled fractures on the mechanical properties and failure characteristics of rocks, uniaxial compression tests were conducted on sandstone specimens with ice-filled fractures of varying inclinations and lengths. Their mechanical responses, acoustic emission (AE) characteristics, and instability mechanisms were systematically analyzed. The results indicate that: (1) Fracture inclination and length significantly affect mechanical parameters (e.g., compressive strength, elastic modulus) of the specimens. All parameters reach the minimum when the ice-filled fracture inclination is 45°, while they decrease continuously with the increase in fracture length. (2) The deformation and failure process of the specimens can be divided into four stages, presenting a tensile-shear mixed failure mode. The RA/AF ratio increases first and then decreases with fracture inclination (peaking at 75°) and decreases continuously with increasing fracture length, confirming that tensile failure dominates in all specimens. (3) The ultimate instability of the specimens is induced by the interaction between wing cracks or between wing cracks and secondary cracks. Increases in both inclination and length of ice-filled fractures intensify crack propagation and specimen damage. (4) A damage constitutive equation established based on statistical distribution theory and the Drucker-Prager (DP) strength criterion yields a validation error of 0.11 %–9.77 %, which can accurately depict the stress-strain behavior. This study reveals the instability mechanism of ice-filled fractured sandstone under water-ice phase transition at multiple scales, providing valuable insights for predicting the mechanical properties of rock masses and ensuring the safety and stability of geotechnical engineering in high-altitude cold regions.

在高海拔极寒地区，岩体一般以冰填裂隙、孔隙和节理为特征，在动力扰动下容易变质失稳。为研究充冰裂缝对岩石力学性能和破坏特征的影响，对不同倾角和长度的充冰裂缝砂岩试件进行了单轴压缩试验。系统分析了其力学响应、声发射特性和失稳机理。结果表明：(1)断裂倾角和断裂长度对试件抗压强度、弹性模量等力学参数影响显著；当充填冰裂缝倾角为45°时，各参数均达到最小值，随着裂缝长度的增加，各参数均不断减小。(2)试件的变形破坏过程可分为4个阶段，呈现拉剪混合破坏模式。RA/AF比随断裂倾角先增大后减小（在75°处达到峰值），随断裂长度的增加而持续减小，证实了所有试样均以拉伸破坏为主。(3)试件的极限失稳是由机翼裂缝之间或机翼裂缝与次级裂缝之间的相互作用引起的。裂隙倾角和长度的增加加剧了裂隙扩展和试样损伤。(4)基于统计分布理论和Drucker-Prager （DP）强度准则建立的损伤本构方程验证误差为0.11% ~ 9.77%，能较准确地描述应力-应变行为。本研究揭示了多尺度水冰相变条件下充冰裂隙砂岩失稳机理，为预测高海拔寒区岩体力学特性和保障岩土工程安全稳定提供了有价值的见解。

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引用次数: 0

Transient testing of tensile ice adhesion 冰的拉伸附着力的瞬态试验

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-12-12 DOI: 10.1016/j.coldregions.2025.104795

Ali Raza Shaikh, Mete Abbot, Jeanette Hussong, Ilia V. Roisman

Icing of solid surfaces is a critical concern across various industries, as it can compromise the safety, performance, and reliability of systems. Mechanical ice removal is one of the various existing and emerging de-icing strategies. Ice removal is determined partially by the characteristic stresses associated with ice adhesion, specifically the values of the corresponding critical stresses that initiate ice delamination, which involves both adhesion and cohesion phenomena.

This experimental study presents a novel method for measuring tensile ice adhesion based on stress-free ice bridges. The effects of ice bridge geometry, strain rate, and temperature on tensile ice adhesion are systematically measured, including the critical forces and stresses. The results demonstrate that increasing temperature and strain rate lead to a decrease in the ice adhesion strength. On the other hand, increasing the interface area increases ice adhesion strength, which indicates possible edge effects. This work has the potential to advance technologies aimed at ice removal and ice adhesion mitigation, particularly in applications such as de-icing and anti-icing in the automotive and aerospace industries.

固体表面结冰是各个行业的一个关键问题，因为它会损害系统的安全性、性能和可靠性。机械除冰是各种现有和新兴的除冰策略之一。除冰部分取决于与冰粘附相关的特征应力，特别是引发冰分层的相应临界应力的值，这涉及粘附和内聚现象。本实验研究提出了一种基于无应力冰桥的冰张力黏附测量新方法。系统地测量了冰桥几何形状、应变速率和温度对拉伸冰粘附的影响，包括临界力和应力。结果表明，温度和应变速率的升高会导致冰的黏附强度降低。另一方面，界面面积的增加增加了冰的粘附强度，这表明可能存在边缘效应。这项工作有可能推进旨在除冰和减少冰附着的技术，特别是在汽车和航空航天工业的除冰和防冰等应用中。

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引用次数: 0

Spatial–temporal characteristics of soil thermal conductivity in the arctic permafrost in 1980–2020 1980-2020年北极多年冻土土壤热导率时空特征

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-12-09 DOI: 10.1016/j.coldregions.2025.104793

Wenhao Liu , Ren Li , Tonghua Wu , Guojie Hu , Xiaodong Wu , Jimin Yao , Yao Xiao , Shenning Wang , Junjie Ma , Jianzong Shi , Shengfeng Tang , Xiaofan Zhu , Yongping Qiao

Accurate soil thermal conductivity (STC) data and their spatiotemporal variability are critical for the accurate simulation of future changes in Arctic permafrost. However, in-situ measured STC data remain scarce in the Arctic permafrost region, and the STC parameterization schemes commonly used in current land surface process models (LSMs) fail to meet the actual needs of accurate simulation of hydrothermal processes in permafrost, leading to considerable errors in the simulation results of Arctic permafrost. This study used the XGBoost method to simulate the spatial–temporal variability of the STC in the upper 5 cm active layer of Arctic permafrost during thawing and freezing periods from 1980 to 2020. The findings indicated STC variations between the thawing and freezing periods across different years, with values ranging from −0.4 to 0.28 W·m⁻¹·K⁻¹. The mean STC during the freezing period was higher than that during the thawing period. Tundra, forest, and barren land exhibited the greatest sensitivity of STC to freeze–thaw transitions. This is the first study to explore the long-term spatiotemporal variations of STC in Arctic permafrost, and these findings and datasets can provide useful support for future research on Arctic permafrost evolution simulations.

准确的土壤热导率（STC）数据及其时空变化对于准确模拟北极永久冻土的未来变化至关重要。然而，在北极多年冻土区，原位测量的STC数据仍然很少，目前陆地表面过程模型（LSMs）中常用的STC参数化方案不能满足精确模拟多年冻土热液过程的实际需要，导致北极多年冻土区的模拟结果存在较大误差。利用XGBoost方法模拟了1980 ~ 2020年北极多年冻土融化和冻结期上部5cm活动层温度的时空变化。结果表明，不同年份解冻期和冻结期的STC变化范围为- 0.4 ~ 0.28 W·m−1·K−1。冻结期的平均STC高于解冻期。冻融变化对冻融变化最敏感的是冻原、森林和荒地。本研究首次探索了北极永久冻土中STC的长期时空变化，这些发现和数据集可以为未来北极永久冻土演变模拟研究提供有用的支持。

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引用次数: 0

Normalized comparative study of ice accretion on wind turbine blades: Influence of airfoil geometry and size 风力涡轮机叶片冰积的标准化比较研究：翼型几何形状和尺寸的影响

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-12-08 DOI: 10.1016/j.coldregions.2025.104792

Zhiqiang Liu, Kebo Ma, Nan Xie

Ice accretion on wind turbine blades in cold and humid climates critically impacts energy output, equipment lifespan, and operational safety. To clarify the mechanisms and guide targeted anti−/de-icing strategies, this study employs CFD simulations on airfoils with different geometries and chord lengths, representing various spanwise positions along the blade, under a wide range of droplet velocity, liquid water content (LWC), ambient temperature, and median volume diameter (MVD). Meanwhile, ice shapes are normalized in polar coordinates for direct comparison of morphology, maximum thickness, and coverage range. Key findings are: (1) icing characteristics result from the coupled influence of climatic parameters and airfoil geometry, with strong nonlinear interactions, especially among LWC, velocity, and geometry; (2) the symmetric NACA0012 shows consistently distinct icing patterns compared to NACA4412 and DU96-W − 180, whereas the latter two behave similarly across conditions; and (3) toward the blade root, larger airfoil size reduces the prominence of icing features, with geometric scaling playing a decisive role alongside velocity. Although formulating a unified quantitative model remains difficult, the results enable simplified, engineering-level estimation of icing characteristics within acceptable error margins. These insights provide a reference for designing more broadly applicable anti−/de-icing systems and predictive tools for wind turbine blades in cold/humid-weather operation.

在寒冷和潮湿的气候条件下，风力涡轮机叶片上的冰积累严重影响能量输出、设备寿命和运行安全。为了阐明机理并指导有针对性的反/除冰策略，本研究采用CFD模拟了不同几何形状和弦长的翼型，代表了沿叶片的不同展向位置，在大范围的液滴速度、液态水含量（LWC）、环境温度和中位体积直径（MVD）下。同时，冰的形状在极坐标中被归一化，以便直接比较冰的形态、最大厚度和覆盖范围。主要研究结果表明：(1)结冰特性是气候参数和翼型几何形状耦合影响的结果，具有较强的非线性相互作用，特别是LWC、速度和几何形状之间的相互作用；(2)与NACA4412和DU96-W−180相比，对称型NACA0012表现出明显不同的结冰模式，而后者在不同条件下表现相似；(3)向叶根方向，较大的翼型尺寸减小了结冰特征的突出性，几何尺度在速度方向起决定性作用。尽管制定统一的定量模型仍然很困难，但结果使在可接受的误差范围内对结冰特性进行简化的工程级估计成为可能。这些见解为在寒冷/潮湿天气下设计更广泛适用的防冰/除冰系统和预测工具提供了参考。

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引用次数: 0

A double-a ice detachment failure criterion for overhead transmission lines subjected to shock loads 冲击载荷作用下架空输电线路的双A冰分离失效判据

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-12-08 DOI: 10.1016/j.coldregions.2025.104790

Chao Zhou , Liangchen Zhao , Kun Peng Ji

A double-a ice detachment failure criterion is proposed for iced overhead transmission lines to evaluate the transient response of line systems subjected to shock loads. The criterion incorporates the strain energy density factor, a fracture mechanics parameter, to model the crack propagation process leading to ice shedding, and is implemented into finite element analysis by setting ice element critical acceleration a_c and a₀. The criterion is defined as follows: if the ice element acceleration a exceeds the critical value a_c, ice sheds from overhead transmission lines. When a_c > a > a₀, no ice shedding occurs, but subcritical crack growth necessitates an update of the critical acceleration from a_c0 to a_c1. If a ≤ a₀, the ice remains adhered, and a_c remains unchanged. The criterion was validated through experimental tests and compared with the previous ice detachment failure criterion in DAC de-icing cases. The results show that the presented criterion can accurately predict the ice shedding rate and key parameters of the maximum tension, maximum displacement, especially in multiple shock de-icing conditions.

为评价线路系统在冲击载荷作用下的暂态响应，提出了一种双A型冰分离失效准则。该准则采用应变能密度因子（断裂力学参数）来模拟导致冰脱落的裂纹扩展过程，并通过设置冰单元临界加速度ac和a0来实现有限元分析。判据定义如下：当冰元加速度a超过临界值ac时，冰从架空输电线路上脱落。当ac >； a >； a0时，不发生冰脱落，但亚临界裂纹扩展需要将临界加速度从ac0更新到ac1。如果a≤a0，冰保持粘着，ac保持不变。通过实验验证了该准则，并将其与DAC除冰情况下的冰脱破坏准则进行了比较。结果表明，该准则能较准确地预测除冰速率和最大张力、最大位移等关键参数，特别是在多重冲击除冰条件下。

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