Numerical investigation on internal heat transfer characteristic of film plate in a new double-wall liner

Numerical simulation was carried out to study the internal flow and heat transfer characteristics of the double-wall afterburner liner which was added with second oblique impingement. Internal heat transfer coefficient distribution on the film plate was investigated at different impingement distances and different middlehole diameters in the Reynolds number range of 2500~7500. The results show that the region with high heat transfer extends and the area-average Nusselt number increases with the decrease of the impingement distance. The interaction of the second impingement and the vortex flow in the cavity where the film holes were located is mainly influenced by the variation of the impingement distance. In the cavity where the film holes were located, the region with the vortex impingement increases and the region of the second impingement decreases with the decrease of the middle-hole diameter. The area-average Nusselt number increases with the decrease of the middle-hole diameter.