On multiple-path sonic anemometer measurement theory

Cuerva Tejero, Alvaro and Sanz Andres, Angel Pedro and Navarro, A. (2003). On multiple-path sonic anemometer measurement theory. "Experiments in Fluids", v. 34 (n. 3); pp. 345-357. ISSN 0723-4864. https://doi.org/10.1007/s00348-002-0565-x.

Description

Title: On multiple-path sonic anemometer measurement theory
Author/s:
  • Cuerva Tejero, Alvaro
  • Sanz Andres, Angel Pedro
  • Navarro, A.
Item Type: Article
Título de Revista/Publicación: Experiments in Fluids
Date: 2003
ISSN: 0723-4864
Volume: 34
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Vehículos Aeroespaciales [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

In this paper, a model of the measuring process of sonic anemometers with more than one measuring path is presented. The main hypothesis of the work is that the time variation of the turbulent speed field during the sequence of pulses that produces a measure of the wind speed vector affects the measurement. Therefore, the previously considered frozen flow, or instantaneous averaging, condition is relaxed. This time variation, quantified by the mean Mach number of the flow and the time delay between consecutive pulses firings, in combination with both the full geometry of sensors (acoustic path location and orientation) and the incidence angles of the mean with speed vector, give rise to significant errors in the measurement of turbulence which are not considered by models based on the hypothesis of instantaneous line averaging. The additional corrections (relative to the ones proposed by instantaneous line-averaging models) are strongly dependent on the wave number component parallel to the mean wind speed, the time delay between consecutive pulses, the Mach number of the flow, the geometry of the sensor and the incidence angles of mean wind speed vector. Kaimal´s limit k W1=1/l (where k W1 is the wave number component parallel to mean wind speed and l is the path length) for the maximum wave numbers from which the sonic process affects the measurement of turbulence is here generalized as k W1=C l /l, where C l is usually lesser than unity and depends on all the new parameters taken into account by the present model.

More information

Item ID: 39786
DC Identifier: http://oa.upm.es/39786/
OAI Identifier: oai:oa.upm.es:39786
DOI: 10.1007/s00348-002-0565-x
Official URL: http://link.springer.com/article/10.1007%2Fs00348-002-0565-x
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 01 Apr 2016 10:07
Last Modified: 01 Apr 2016 10:07
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