新しい熱線プローブの開発(流体工学,流体機械)

概要

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We manufactured a new hot-wire probe (abbreviated as NHP) with two parallel wires placed close together for measuring a transitional boundary-layer flow. The main feature of NHP was that it was much smaller than conventional multi-sensor probes, such as an X-type probe. Thus, the present probe could be regarded as a sensor similar to an I-type probe in configuration ; we expected to obtain high spatial resolution for the velocity components. The principle of measurement was very simple so that streamwise and normalwise velocity components were simultaneously obtained from sums and differences of the linearized hot-wire outputs with aid of the look-up matrix method. As a result, we found that although the characteristics between the hot-wire output and flow angle are very complicated, we can obtain simple relations between them if flow angle is confined from -30° to 30°. Moreover, we measured velocity profiles in a low Reynolds number turbulent boundary layer using NHP. From results obtained, it was found that NHP is very useful tool for measuring velocities in a thin boundary layer.
一般社団法人日本機械学会の論文
2007-03-25