高遠心力場における回転軸に平行な矩形流路の伝熱特性 : 第1報, タービン発電機の通風冷却特性の解明

概要

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The heat transfer characteristic of a rectangular channel rotating about a parallel axis in a high centrifugal acceleration field, which is used for field-coil end cooling of a turbine generator, is measured. The aspect ratios H/B of the channel are 6, 30, and 60. The channel wall are heated in full of the cooling perimeter in the case of H/B=6 and in half of that in the case of H/B=30, 60. For the measurement of the heat transfer, a test stand with a model rotor of 〓750mm outer diameter was made. The range of rotating speed of the model rotor in from 800 to 3000rpm, which corresponds to 200-2700 times that of gravity. It is found that the heat transfer is mainly controlled by fluid velocity and in weakly affected by buoyancy near by wall which is represented by Rayleigh number. In the experimental range of H/B from 6 to 60, the measured heat transfer characteristics are almost equal to that which is already reported about a round pipe.
社団法人日本機械学会の論文
2000-10-25