摘要
应用数值方法和标准k-ω湍流模型,研究了燃气轮机轴流透平不同叶顶密封方式对透平动叶顶部间隙内流动与传热的影响.计算叶型采用GE-E3发动机高压透平第一级动叶片,考虑了4种不同的叶顶密封方式.详细分析了不同叶顶密封时叶顶的流动结构和传热分布.研究了旋转对动叶顶部流动和传热的影响,并与静止的平面叶栅中获得的结果进行了对比.结果表明:不同叶顶密封方式对叶顶间隙泄漏流场影响很大;双侧肩壁密封具有最好的密封性能,而压力面肩壁密封性能最差;采用吸力面肩壁密封获得了最低的叶顶传热系数,压力面侧肩壁密封的叶顶传热系数则最高;相对于静止叶栅,旋转改变了叶顶泄漏流动结构,增加了叶顶的传热系数.
A numerical prediction was performed to study the effect of squealer geometry on tip leakage flow and heat transfer for the first stage rotor blade in a high pressure turbine of GE-E^3 engines. Calculations were conducted for four different squealer geometry arrangements by solving Reynolds-averaged N-S equations in conjunction with the standard k-ω two-equation turbulence model. Flow structure and heat transfer characteristics in the tip gap were presented. The effect of blade rotation was analyzed and compared with that obtained from linear cascade. The results show that the minimum leakage flow occurs when the full squealer tip is adopted. In addition the tip heat transfer coefficient is the lowest when suction side squealer geometry is used.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2008年第5期537-541,共5页
Journal of Xi'an Jiaotong University
基金
国家重点基础研究发展计划资助项目(2007CB210107)
关键词
轴流透平
顶部传热
叶顶形状
间隙泄漏流
axial turbine
tip heat transfer
squealer tip
tip leakage flow
