Flow disturbance due to presence of the vane anemometer

21st Fluid Mechanics Conference

物理学;力学

Bujalski, M.^1 ; Gawor, M.^1 ; Sobczyk, J.^1

Laboratory of Flow Metrology, Strata Mechanics Research Institute, Polish Academy of Sciences, Krakow, Poland^1

关键词: Experimental investigations;    Frequency Analysis;    High temporal resolution;    Hot wire anemometry;    Measurement process;    Particle image velocimetry methods;    Velocity fluctuations;    Velocity vector field;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/530/1/012045/pdf
DOI  :  10.1088/1742-6596/530/1/012045

学科分类：力学，机械学

来源: IOP

【 摘 要 】

This paper presents the results of the preliminary experimental investigations of the disturbance of velocity field resulting from placing a vane anemometer in the analyzed air flow. Experiments were conducted in a wind tunnel with a closed loop. For the measurement process, Particle Image Velocimetry (PIV) method was used to visualize the flow structure and evaluate the instantaneous, two-dimensional velocity vector fields. Regions of inflow on the vane anemometer as well as flow behind it were examined. Ensemble averaged velocity distribution and root-mean-square (RMS) velocity fluctuations were determined. The results below are presented in the form of contour-velocity maps and profile plots. In order to investigate velocity fluctuations in the wake of vane anemometer with high temporal resolution hot-wire anemometry (HWA) technique was used. Frequency analysis by means of Fast Fourier Transform was carried out. The obtained results give evidence to a significant spatially and temporally complex flow disturbance in the vicinity of analyzed instrument.