摘要
本研究通过流热耦合计算和实验验证,比较了圆柱排孔与两种劈缝的出气边冷却结构,在不同雷诺数和冷气质量流率下的流动与传热性能。结果表明:圆柱排孔流阻偏高,受供气压力限制,冷气流量不足,冷却效果下降,造成出气边烧蚀。叶片出气边压力面开设劈缝结构降低流阻,提高了冷气流量。劈缝内采用弦向肋和扰流柱结构强化换热,提高冷却效果。在相同冷气流量下,劈缝结构所需的流动压差明显下降,叶栅叶片的尾迹宽度也减小,对降低下游叶栅的流动损失和表面传热是有利的。
Through a flow and heat coupling calculation and test verification,compared were the flow and heat transfer performance of the trailing edge cooling structure with cylindrical holes in a row and two types of cutback at various Reynolds numbers and cooling air mass flow rates. It has been found that the cylindrical holes in a row have an excessively high flow resistance and due to the limitation of the air supply pressure,the cooling air flow rate is excessively low and the cooling effectiveness is not good enough,leading to erosion at the trailing edge at a very high temperature. To provide a blade with a cutback film cooling structure at the trailing edge on the pressure surface can lower the flow resistance and enhance the cooling air flow rate. To adopt the chord-wise rib and pinfin cooling structure inside the slot can intensify the heat exchange and improve the cooling efficiency. At a same cooling air flow rate,the pressure difference required by the flow in the cutback cooling structure will notably drop and the width of the wake of blades in a cascade will also become small,thus favorable for reducing the flow losses and surface heat transfer in cascades at the downstream.
出处
《热能动力工程》
CAS
CSCD
北大核心
2016年第11期32-37,共6页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金资助项目(51276116)
关键词
圆柱排孔
劈缝
冷却效率
尾迹结构
cylindrical holes in a row
cutback
cooling efficiency
wake trace configuration
