デジタル遅延補償による温度流速計の性能向上(成層,一般講演)

概要

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The improvement of the measurable velocity range of the thermo-anemometer was realized by the digital delay compensator applying the Super-H microcontroller. The deterioration of the spatial resolution and the phase difference between the temperature and the velocity signals were induced by the streamwise spatial gap among the hot-wire and the cold-wire. The error caused by the spatial gap was compensated through delaying the temperature signal based on the instantaneous velocity signal by the delay compensator, applying Taylor's frozen pattern hypothesis. The delay compensation was indispensable to analyze the higher-order correlations such as heat flux. The newly-designed compensator employing the single chip microcontroller (SH-2A) was applicable to the flow fields with the velocity range of 0.01〜65m/s. The phase difference caused by the error of the delay time of the compensated temperature signal was confirmed less than ±1%. The results of the dynamic characteristic evaluation were apparently showed that the accurate delay compensation was realized for the wide velocity range.
日本流体力学会の論文
2010-09-09