渐缩型连接孔对双层壁冲击冷却的影响  

Influence of tapered bridge holes on impingement double wall cooling for gas turbine blade

作　　者：刘雨松 朱华 严彪 李亮[1] LIU Yusong;ZHU Hua;YAN Biao;LI Liang(Institute of Turbomachinery,School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院叶轮机械研究所,西安710049

出　　处：《航空动力学报》2024年第9期469-477,共9页Journal of Aerospace Power

基　　金：国家科技重大专项(2017-Ⅰ-0009-0010)。

摘　　要：为探究叶片前缘双层壁冲击冷却中连接孔结构对整体流动和换热特性的影响,建立了具有0°、5°、10°、15°、20°倾角的5个渐缩型连接孔冲击冷却模型,采用ANSYS CFX进行数值模拟。结果表明:在双层壁冲击冷却结构中将连接孔调整为渐缩形态能显著提升综合换热能力。当连接孔倾斜角从0°增大到20°,其倾角变化对结构内、外腔室流动损失影响不大;内靶面平均努塞尔数随倾角的变化几乎不变,但外靶面换热强度随着倾角增大先增强后削弱。当连接孔倾角为15°时,外靶面平均努塞尔数最大,相比标准结构提升了19.7%;总综合换热因子随连接孔倾斜角的增大呈现先增大后减小的趋势,倾角为15°时,综合换热因子达到最高,相比于标准结构提升了12.15%。In order to investigate the influence of the bridge holes on flow and thermal behavior of impingement double-wall cooling for gas turbine leading blades,the impingement double-wall cooling configurations with 0°,5°,10°,15°and 20°tapered bridge holes were calculated by using ANSYS CFX numerical simulation.Results indicated that the tapered bridge holes can significantly enhance the comprehensive heat transfer capacity.As the angle of bridge holes increased from 0°to 20°,the angle of holes did not have a significant influence on flow loss of inner and outer chambers for the blades.Likewise,the cooling performance of the inner chamber target wall was not sensitive to the change of the bridge hole angle.With the growing angle of bridge holes,the thermal behavior of the target wall for the outer chamber increased at first and then decreased,reaching the biggest value at 15°.When the angle of bridge holes increased to 15°,its average heat transfer intensity was 19.7%higher than the case with 0°bridge holes.Similarly,the thermal performance factor of the whole configuration also became larger at first and then became smaller.The largest thermal performance factor occurred at 15°too,which was 12.15%higher than the case with 0°bridge holes.

关 键 词：双层壁 冲击冷却 渐缩型连接孔 流动特性 换热特性 综合换热因子 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]