Abstract
The turbine vane endwall downstream of the lean premixed combustor operates in an extremely complicated environment resulting from strong swirling inflow. Consequently, advanced cooling methods should be developed considering aggressive swirling inflow conditions. In the current work, the numerical results indicated that the swirling inflow seriously deteriorated the film cooling level by more than 30%, especially near the pressure side endwall, and it increased the total pressure loss of the vane passage by up to 80%. According to the endwall aerothermal performance under the swirling inflow conditions, the proactive phantom cooling method was presented. With the help of the endwall secondary flow, the proactive phantom coolant could obviously increase the film cooling effectiveness on the endwall and the vane pressure side surface at the same time. Furthermore, the effects of the outlet height and the mass flow rate on the performance of proactive phantom cooling were investigated. The design with h/H = 4.0% and MFR = 0.30% was found to be the best choice in this study with the largest film cooling coverage area and a 44% increase of the overall film cooling effectiveness. This paper provides a novel cooling method to increase the endwall film cooling performance under swirling inflow conditions.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call