複合型インピンジ冷却構造に関する研究 : 実験による内部及び外部伝熱特性同時計測

概要

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This paper deals with experiments on the film effectiveness and heat transfer coefficients for quasi-Transpiration Cooling System, which integrates impingement cooling and pin fin cooling devices into one body. The proposed cooling system aims at enlargement of the effective heat transfer area as well as enhancement of the internal heat transfer. One of the purposes of the present study is to clarify the reason of the observed difference in cooling efficiency for two different internal cooling configurations. Large-scale test models made from acrylic resin are adopted. The experiment is conducted using heated air as secondary air. The experimental technique is a transient method monitoring surface temperature rise using thermochromic liquid crystal coating on the surface, which enables us not only to determine film cooling effectiveness and heat transfer coefficient on film surface, but also to measure target plate and pin fin surface heat transfer coefficients. The experimental results show that an arrangement of the pins is an important factor to internal heat transfer and eventually to total cooling performance.
社団法人日本ガスタービン学会の論文
2007-09-20