Abstract
The procedure is described of experimental investigation of a statistically stationary generally nonisothermal 3D flow by means of a constant temperature anemometer (CTA) using single slanted heated wire, rotary round the fixed axis. The principle of this procedure is quite clear. The change of the heated wire temperature modifies ratio of CTA sensitivities to temperature and velocity fluctuations. Turning the heated wire through a proper angle changes the sensitivity to components of the instantaneous velocity vector. Some recommendations are presented based on long time experiences, e.g. on the choice of probe, on the probe calibration, to the measurement organization and to the evaluation of results.
Highlights
The presented method of measurement by means of a single hot-wire thermo-anemometer is derived on the following assumptions: 1. The investigated object is three-dimensional, non-isothermal and unsteady fluid flow.2
The procedure is described of experimental investigation of a statistically stationary generally nonisothermal 3D flow by means of a constant temperature anemometer (CTA) using single slanted heated wire, rotary round the fixed axis
Here ψ a and ψ b are turning angles at which the wire is perpendicular to the mean velocity i.e. position of maximal wire heat loss that appears in maxima of the CTA output signal Ea, Eb
Summary
The presented method of measurement by means of a single hot-wire thermo-anemometer is derived on the following assumptions: 1. The investigated object is three-dimensional, non-isothermal and unsteady fluid flow. Here ψ a and ψ b are turning angles at which the wire is perpendicular to the mean velocity i.e. position of maximal wire heat loss that appears in maxima of the CTA output signal Ea , Eb. The relation is valid ψ b = 2(π + β ) −ψa. Having in mind the relations (11), (13) and (14), the direction of the mean velocity vector could be determined from the measurement of the CTA output signal distribution E versus ψ and evaluating extremes. Ψ ψ subscripts at the round brackets indicate that measurement of e2 E 2 must be done at several wire temperatures Tw and some roll angels ψ Afterwards they are possible the interpolations of the turbulent heat transfer vector components wit (WT ), i = 1, 2,3
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