正方配列十字形衝突噴流の熱伝達特性と壁噴流の流動機構(日本ガスタービン学会創立40周年記念特集)

概要

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Multi-impinging cross-shaped jet is expected to enhance flow mixing owing to the vortex structure of jet shear layer. The flow structure among adjacent impinging jets on the target surface has been investigated. 3×3 square arrays of circular and cross-shaped jet were tested at jet diameter Reynolds number of 4,680, normalized nozzle to impingement distance of 2 and 4, and jet-to-jet spacing 4 and 6. Both flow visualization and measurement of near-wall flow using micro flow sensor have been conducted. The location of the flow separation on the target surface and the flow behavior in cross-shaped jets are different from those in circular jets. It has been also found that the distinguishing flow field with the flow intermittency is induced by the effect of jet shape and the flow interaction among adjacent impinging jets along the diagonal line. Cross-shaped jets generating these phenomena contribute to the enhancement of the heat transfer at the intermediate area enclosed by four impinging jets compared with circular jets at the short injection distance.
2013-01-18