交错肋结构涡轮叶片内部冷却通道的流动换热特性研究

利用数值模拟方法研究了交错肋结构涡轮叶片内部冷却通道的流动换热特性,分析了交错肋冷却通道的流动换热机理。交错肋结构在明显提高通道冷却性能的同时也带来了较大的流动损失,随着肋倾角、肋宽的增大,通道的换热能力增强,阻力损失增大;随着肋间距的增大通道的换热能力降低,阻力损失减小。利用瞬态液晶实验技术对交错肋冷却通道进行实验研究,进一步分析了交错肋冷却通道的流动换热机理,并验证了所采用的数值模拟方法是可行的。

Research on the flow and heat transfer performance of crossed-rib turbine blade cooling channels

The method of numerical simulation is used to study the heat transfer and flow characteristics of the crossed-rib cooling channels of turbine blade, analyze the flow and heat transfer mechanism of crossed-rib channel. The structure of crossed-rib improve the heat transfer characteristics of the crossed-rib cooling channels, however the flow characteristics is reduced.Along with the increase of width and obliquity of crossed-rib, the heat transfer characteristics of the crossed-rib cooling channels is enhancing, the flow characteristics is reducing. With the increase of crossed-rib spacing, the heat transfer characteristics of the crossed-rib cooling channels is reducing, the flow characteristics is enhancing. The transient thermochromic liquid crystal technique is used to study the crossed-rib channel so that we can analyze the flow and heat transfer mechanism of crossed-rib channel deeply. Then the Result of experimental and numerical simulation are comparative analyzed to verify the feasibility of the numerical simulation method