Triple-Hot-Film Anemometer Performance in Cases-99 and A Comparison With Sonic Anemometer Measurements

Skelly, Brian; Miller, David R.; Meyer, Thomas H.

doi:10.1023/a:1019906521898

Cited by 23 publications

(15 citation statements)

References 12 publications

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“…More recently, the EDRbased techniques have been used to inform clear air turbulence for commercial aircraft as well as for optimum siting of wind turbines; hence, increasing attention is being given to understanding of the fundamental dynamics of TKE dissipation (Cornman et al 2004;Fang et al 2008). The direct measurement of « in the atmosphere using high-resolution instruments, such as hot film/wire, that can resolve dissipation scales has been rare (Skelly et al 2002;Poulos et al 2006), given the intricacy and logistical restrictions of the instruments involved. Such techniques also assume that turbulence is statistical stationary, which is not always satisfied in the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…During the Cooperative Atmospheric Surface Exchange Study in October 1999, Skelly et al (2002 deployed two levels of triple-hot-film and sonic anemometers on a 5.5-m tower. During the Cooperative Atmospheric Surface Exchange Study in October 1999, Skelly et al (2002 deployed two levels of triple-hot-film and sonic anemometers on a 5.5-m tower.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In Situ Calibration of Hot-Film Probes Using a Collocated Sonic Anemometer: Implementation of a Neural Network

Kit

Cherkassky

Sant

et al. 2010

Journal of Atmospheric and Oceanic Technology

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Although the integral quantities of atmospheric turbulence are conveniently measured using sonic anemometers, obtaining relevant finescale variables such as the kinetic energy dissipation using conventional hot-film/wire techniques remains a challenge because of two main difficulties. The first difficulty is the mean wind variability, which causes violation of the requirement that mean winds have a specific alignment with the hot-film/wire probe. To circumvent this problem, a combination of collocated sonic and hot-film anemometers, with the former measuring mean winds and aligning the latter in the appropriate wind direction via an automated platform, is successfully designed and implemented. The second difficulty is the necessity of frequent and onerous calibrations akin to hot-film anemometry that lead to logistical difficulties during outdoor (field) measurements. This is addressed by employing sonic measurements to calibrate the hot films in the same combination, with the output (velocity) to input (voltage) transfer function for the hot film derived using a neural network (NN) model. The NN is trained using low-pass-filtered hot-film and sonic data taken in situ. This new hot-film calibration procedure is compared with the standard calibration method based on an external calibrator. It is inferred that the sonic-based NN method offers great potential as an alternative to laborious standard calibration techniques, particularly in the laboratory and in stable atmospheric boundary layer settings. The NN approximation technique is found to be superior to the conventionally used polynomial fitting methods when used in conjunction with unevenly spaced calibration velocity data generated by sonic anemometers.Corresponding author address: E. Kit, School of Mechanical Engineering, Tel-Aviv University, Ramat Aviv, Tel Aviv 69978,

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Calibration of Hot-Film Probes Using a Collocated Sonic Anemometer: Implementation of a Neural Network

Kit

Cherkassky

Sant

et al. 2010

Journal of Atmospheric and Oceanic Technology

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“…Чувствительным элементом датчиков термоанемометра в обоих случаях была нихромовая нить диаметром 5 µm и длиной 5 mm. Метод термоанемометрии для исследования газодина-мики и локальной теплоотдачи газовых потоков был выбран на основе анализа литературы по эксперимен-тальному исследованию турбулентных потоков, в част-ности [14][15][16][17], и сложившихся подходов к изучению нестационарных течений. Применимость метода термо-анемометрии для исследования процессов в газовоз-душных системах поршневых двигателей обоснована в классических работах [1,2].…”

Section: экспериментальные установки и средства измеренийunclassified

О Влиянии Поперечного Профилирования Каналов На Термомеханику Пульсирующих Потоков

Бродов¹,

Жилкин²,

Плотников³

2018

Журнал Технической Физики

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“…We define the turbulence as deviations from an averaging time, τ , determined from the heat flux cospectra (Howell and Mahrt 1997;Skelly et al 2002;Vickers and Mahrt 2006;Acevedo et al 2007; van den Kroonenberg and Bange 2007;Hiscox et al 2006;Voronovich and Kiely 2007). This approach attempts to reduce contamination of turbulent fluxes by large random errors associated with inadvertent capture of mesoscale motions.…”

Section: Computation Of Fluxesmentioning

confidence: 99%

The Influence of Transient Flow Distortion on Turbulence in Stable Weak-Wind Conditions

Mahrt

2007

Boundary-Layer Meteorol

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Transport by very weak turbulence near the surface, particularly with strong stratification, often violates existing similarity theory due partly to transient distortion of the wind profile by nonstationary mesoscale motions. This problem is examined with 4 months of flux data at seven levels on a 30-m tower. Difficulties with calculation of fluxes and shear with weak winds and weak turbulence are examined. The distortion of the wind profile assumes a wide variety of forms, but sometimes occurs with a transient wind maximum in the lowest 10 m. Though the vertical mixing of momentum is weak for weak-wind nonstationary conditions, it is often more efficient than predicted by existing similarity theory. In fact for weak-wind stable conditions, the flux-gradient relationship depends more on the curvature of the wind profile than the value of the stability parameter. This statistical study suggests a new direction for future work, but does not unravel the physics of the complex and varied structure for stratified weak-wind conditions.

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Triple-Hot-Film Anemometer Performance in Cases-99 and A Comparison With Sonic Anemometer Measurements

Cited by 23 publications

References 12 publications

In Situ Calibration of Hot-Film Probes Using a Collocated Sonic Anemometer: Implementation of a Neural Network

In Situ Calibration of Hot-Film Probes Using a Collocated Sonic Anemometer: Implementation of a Neural Network

О Влиянии Поперечного Профилирования Каналов На Термомеханику Пульсирующих Потоков

The Influence of Transient Flow Distortion on Turbulence in Stable Weak-Wind Conditions

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