【摘 要】
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A numerical investigation and experimental validation is performed to address deeper insights into the combined effect of shaped holes and Sand-Dune-shaped upst
【机 构】
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College of Energy and Power Engineering,Key Laboratory of Thermal Management and Energy Utilization
论文部分内容阅读
A numerical investigation and experimental validation is performed to address deeper insights into the combined effect of shaped holes and Sand-Dune-shaped upstream Ramp (SDR)on enhancing the film cooling effectiveness,under a wide blowing ratio range (M =0.25-1.5).Three kinds of holes (Cylindrical Hole (CH),Fan-Shaped Hole (FSH),and Crater-Shaped Hole (CSH)) are taken into consideration.The SDR shows an inherent affecting mechanism on the mutual interaction of jet-in-crossflow.It aggravates the lateral spreading of cooling jet and thus improves the film cooling uniformity significantly,regardless of film-hole shape and blowing ratio.When the blowing ratio is beyond 1.0,the combined effect of shaped holes and SDR on improving film cooling effectiveness behaves more significantly.It is suggested that FSH-SDR is a most favorable film cooling scheme.For FSH-SDR case,the spatially-averaged film cooling effectiveness is increased monotonously with the increase of blowing ratio,among the present bowing ratio range.
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