Abstract
A practical technique comprising two V-shaped hot-wires in an X array is proposed for the simultaneous measurement of the instantaneous streamwise and lateral velocity components in low velocity turbulence. The accuracy of the technique is investigated by an error analysis in simulated Gaussian velocity fields generated by means of a digital computer. The result shows that turbulence quantities obtained by the proposed technique are reliable and significantly more accurate than those by a conventional X-wire even in high-intensity turbulence. Furthermore the measurement of a natural-convection boundary layer along a flat plate has proved that the V·shaped hot-wires are highly effective for the measurement of near-wall turbulence at low velocities.
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