熱線流速計のプローブ端部からの熱伝導に伴う誤差とその低減法

概要

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Measurement error of a hot wire air flow meter due to heat conduction loss through probe supports was analyzed and a method for error reduction was proposed. The air flow meter uses constant temperature difference principle, which is composed of a hot wire probe and an air temperature probe. When both of the probe support are heated, the air temperature probe and the hot wire probe are influenced by heat conduction through the supports. Temperature of the air temperature probe becomes higher than that of air flow and heat quantity which conducts from the hot wire probe to the wall decreases. These two points lead to the measurement error of the hot wire air flow meter. But the error can be reduced, when size and material of two probes and these supports are selected appropriately. In practical use, when the same probes are used for the hot wire and air temperature probes, the error due to heat conduction loss can be reduced. This effect is described by experimentally and analytically.
一般社団法人日本機械学会の論文
2000-12-25