角度付き乱流促進体の研究

概要

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Detailed study on heat transfer and pressure loss within rib-roughened cooling passages was made, which purpose was to investigate the effects of rib angles set to the flow direction (90°, 60°, 45° and 30°). A unique technique using coating material with relatively low melting point was applied that could make it possible to measure the heat transfer over the whole region concerned easily. Some noticable results are obtained that can be summerized as follows; (1) In the case of rib angle 60° , overall heat transfer considerably increases compared with that of rib angle 90° with some more expense of pressure loss . On the other hand, the case of rib angle 30° gives almost the same level of averaged heat transfer as in the case of 90° with less pressure loss. (2) Comparison between two patterns of Nusselt number distribution and oil flow on the rib-roughened wall shows that high Nusselt number appears at the region where the reattachment of the seperate flow happe-ns to be very close to the rib . On the contrary, low Nusselt number region corresponds to the region where the flow seperation covers almost entire area between two roughness ribs. (3) The empirical correlation by Han et al. (1985) has turned out to predict friction coefficients in the passage fairly well.
社団法人日本ガスタービン学会の論文
1989-06-10