180°急激曲がり部をもつリブ付き冷却流路内の流れと熱伝達

概要

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The primary objective of the present study is to investigate experimentally the effect of a combination of rib patterns in the before-turn and the after-turn channels on the pressure drop and heat transfer in turbulent flow in a twopass square channel. Emphasis is placed on examining the interactions of the two secondary flows; one induced by the ribs and the other formed in the turn. The rib pitch-toequivalent diameter ratio (P/de) is 1.0,the rib-height-to-equivalent diameter ratio (e/de) is 0.09,and the rib angle relative to the main flow direction is varied from 30゜〜90゜ with an interval of 15゜. Experiments are conducted for Reynolds numbers in the range 4,000〜30,000. It was disclosed that, due to the interactions between the bend-induced secondary flow and the rib-induced secondary flow, the combination of rib patterns in the channel before and after the turn causes considerable differences in the pressure drop and heat transfer performance of the entire channel.
公益社団法人日本ガスタービン学会の論文
1995-09-10