Aerodynamic and aeroelastic wind tunnel model tests of overhead power lines in triangular configuration under different icing conditions

Flaga, Andrzej; Pistol, Aleksander; Krajewski, Piotr; Flaga, Łukasz

doi:10.1016/j.coldregions.2019.102919

Cited by 13 publications

(3 citation statements)

References 21 publications

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“…In close vicinity of the site there are other high-rise buildings -both already erected and approved. This list includes: Model tests were conducted in the boundary layer wind tunnel of Cracow University of Technology, described in detail in Flaga et al [1]. Wind flow velocity measurements are conducted with hot-wire anemometric system ( Fig.…”

Section: Subject Of Model Testsmentioning

confidence: 99%

Pedestrian Wind Comfort at the Vicinity of a Planned High-Rise Building With Varying Surrounds

Kiesiewicz

Pistol

Flaga

2020

WIT Transactions on Engineering Sciences

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Evaluation of pedestrian wind comfort around new developments has become crucial when planning erections of high-rise buildings, with many countries directly requiring it for planning permissions. This paper describes a case study of a high-rise building planned in the centre of Birmingham, where rapid development requires assuming various development scenarios for the tests. Wind microclimate assessment was done according to the Lawson comfort criteria, which are considered an industry standard in the United Kingdom. This required not only measuring the mean wind velocity at each of the measuring locations but also an extreme value analysis. The basis of the assessment was wind tunnel model tests, conducted for three different development scenarios: existing development, existing development with the subject building and future development with all the planned buildings within the nearest surroundings. Including other planned skyscrapers was essential, as on the opposite side of the street one of the tallest buildings in Birmingham would be situated. Furthermore, three different seasonal circumstances were considered in the assessment: annual, summer (most time spent outside, therefore the strictest requirements) and winter (most harsh weather conditions). Pedestrian wind comfort was evaluated at about 80 measuring points, located along the main transit pathways and recreational spaces in the proximity of the development. A total of 18 wind direction sectors were included in the tests, with meteorological data taken from the Birmingham Airport station. The obtained results showed that a slight decrease of wind comfort was observed at certain locations, but not too severe and the adjusted development still fit within the assumed criteria, both in terms of comfort and safety. A variety of parameters chosen for the analysis-different development scenarios and weather conditions-allowed for a comprehensive and robust analysis of wind comfort conditions at the site.

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Section: Subject Of Model Testsmentioning

confidence: 99%

Pedestrian Wind Comfort at the Vicinity of a Planned High-Rise Building With Varying Surrounds

Kiesiewicz

Pistol

Flaga

2020

WIT Transactions on Engineering Sciences

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“…Model tests were conducted in the boundary layer wind tunnel of Cracow University of Technology, described in detail in [2]. DTC Initum pressure scanners system was used for analogue signal data acquisition and digitalization.…”

Section: Measuring Apparatusmentioning

confidence: 99%

Spatial Averaging Approach for Determining Wind Pressures and Forces on High-Rise Buildings

Pistol¹,

Kiesiewicz²,

Flaga³

2020

WIT Transactions on Engineering Sciences

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, which focused on a planned high-rise building (165 m tall) located in Warsaw, Poland. The aim of the tests was to determine the wind action on the subject building's structure and claddings. A total of 383 measuring points were distributed on the external surfaces of the building. Local values of wind pressures and suctions at each measuring point were calculated on the basis of wind tunnel measurements using quasi-static extreme peak values envelope model. These values may be used to design the cladding of the building. However, in order to determine the global values of wind pressure/wind forces on the structure, a spatial averaging of these values is required. This allows taking into account the vortex scale in relation to the size of the building, that is, the fact that the peak values of wind pressure are not present simultaneously at each measuring point. Such an approach can render the results obtained from model tests closer to the reality. It provides a conservative estimation of wind pressure values without too large overestimation of the wind actions, which could result in unnecessary overdesigning of structure elements and larger material expenditure. The paper discusses in detail the method suggested by the authors and the obtained results. The results are provided in the form of 3D surface plots on the building's façades and global wind forces acting on the whole structure. The obtained results allowed the consulting engineers to adopt reliable and robust values of wind pressure acting on the structure. These values are calculated taking into account both the non-stationary, non-uniform nature of the wind and aerodynamic interference of the building's surroundings, which in large portion consists of other high-rise buildings.

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“…It is found that the aerodynamic coefficients of the sub-conductors are different from each other and the difference will affect the initiation and behaviour of galloping of iced bundle conductor lines [6,7]. Recently, the wind tunnel tests were used to measure the aerodynamic coefficients of conductors with different shaped ice by other authors [8][9][10].…”

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Prediction model for aerodynamic coefficients of iced quad bundle conductors based on machine learning method

et al. 2021

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The lift, drag and torsional moment coefficients, versus wind attack angle of iced quad bundle conductors in the cases of different conductor structure, ice and wind parameters are numerically simulated and investigated. With the Latin hypercube sampling and numerical simulation, sampling points are designed and datasets are created. Set the number of sub-conductors, wind attack angle, bundle spacing, ice accretion angle, ice thickness, wind velocity and diameter of the conductor as the input variables, a prediction model for the lift, drag and moment coefficients of iced quad bundle conductors is created, trained and tested based on the dataset and extra-trees algorithm. The final integrated prediction model is further validated by applying the aerodynamic coefficients from the prediction model and numerical simulation, respectively, to analyse the galloping features. The developed efficient prediction model for the aerodynamic coefficients of iced quad bundle conductors plays an important role in the quick investigation, prediction and early warning of galloping.

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Aerodynamic and aeroelastic wind tunnel model tests of overhead power lines in triangular configuration under different icing conditions

Cited by 13 publications

References 21 publications

Pedestrian Wind Comfort at the Vicinity of a Planned High-Rise Building With Varying Surrounds

Pedestrian Wind Comfort at the Vicinity of a Planned High-Rise Building With Varying Surrounds

Spatial Averaging Approach for Determining Wind Pressures and Forces on High-Rise Buildings

Prediction model for aerodynamic coefficients of iced quad bundle conductors based on machine learning method

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