Thermal analysis of guide vanes with full double wall cooling structure with focusing on leading edge cooling

Abstract

In order to explore the thermal characteristics of the leading edge structure of the full double wall cooling structure guide vane, a double wall cooling structure guide vane is established on the basis of the vane model and the proven simulation method including of k-ε model and Fluid-Structure interaction method. Air film holes, impingement holes and spoiler columns with different forms are constructed at the leading edge of the vane, and the thermal characteristics of various structures are discussed through 3D simulation under many kinds of cooling conditions. The 30° left deviation of air film hole with good combination of dynamic and static pressure showed the most excellent air film coverage effect. The scheme of adding a row of impingement holes has better air film effect than the scheme of increasing the diameter of the impingement holes, due to the fact that the high-speed airflow from large diameter impingement hole accounts for about only 50% of the total airflow. The flow turbulence degree in the 30° left-deviation air film hole is much higher than that of the vertical angle. The compound angle and spoiler columns in local design can improve the local cooling effect, on the outer and inner surfaces of the vanes, respectively.