20511 内燃機関の燃焼室における境界層温度分布の測定(エネルギー・環境問題に対応するエンジン・燃料技術(2),OS.11 エネルギー・環境問題に対応するエンジン・燃料技術)

概要

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The thermal boundary layer near the combustion chamber wall of internal combustion engine has the important key to decrease in the cooling loss. And, it's thought that the pollutant emission such as unburnt hydrocarbons exists near the wall because combustion flame is quenched when it approaches the wall. Therefore, the thickness and temperature distribution in the boundary layer are important. Then, resistance thermometer with tungsten wire of 5 μm diameter is developed for the purpose of measuring boundary layer temperature directly. The measurement of boundary layer temperature is carried out by using a rapid compression-expansion machine. The nitrogen gas is used in order to oxidation prevention of tungsten wire. The measurement of the various positions in the combustion chamber is possible to make the measurement position movable in the vertical direction to wall. As a result of experiment, thermal boundary layer thickness in compression stroke was 0.5mm in maximum.
社団法人日本機械学会の論文
2009-03-05