噴流による後ろ向きステップ下流の再付着領域の熱伝達特性の制御に関する研究 : 第1報,噴流位置および噴流速度の効果について

概要

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The local heat transfer coefficients downstream of a backward-facing step were measured at various jet locations and jet velocities by discharging a jet perpendicularly to the main flow to control the heat transfer characteristics. It was found that flow field is characterized by the formation of a circulating bubble at the rear of a jet port on the opposite wall of the step surface (i.e., the jet port side), where the bubble causes acceleration of the main flow and shortening of the reattachment point length. Furthermore, at the optimum position X_j/H=2. 1(X_j : location of jet, measured from the step)position, H : the step height), the augmentation of mean heat transfer coefficients can be as much as 1. 6 times the value without jet discharge. Thus, by using a jet it is possible to control the heat transfer effectively.
社団法人日本機械学会の論文
1993-02-25