An experimental study of the effects of different transverse trenches on deposition on a turbine vane with film-cooling at high temperature

Turbine vanes may be subjected to particle deposition, which usually has negative effect on the aerodynamical and heat transferring performances of vanes. If a vane has film-cooling configuration, particle deposition may also block film-cooling holes. Therefore, it is of interest to reduce the harm of particle deposition on vanes. In this paper, an experiment is designed to investigate the effects of different transverse trenches on the deposition on a turbine vane. The mainstream temperature is high and comparable to that of typical turbines and the particles are sands. These transverse trenches are arranged along the rows of film-cooling holes. It is found from the tests that the transverse trenches could reduce total deposition mass and make the deposition distribution on the pressure surface more uniform. Based on the deposition on the suction surface, the deposition reduction effectiveness of the trenches is also analyzed and corrected. In general, deeper trenches could reduce more deposition near the film-cooling holes. The temperature reduction on the pressure surface due to the transverse trenches is also detected and deeper trenches results in lower temperature. The results in this paper are similar to those by the tests at low temperatures. The results may be helpful for the design to reduce the harm of sand deposition on vanes.