关键词: 船舶燃气轮机;肋倾角;流动换热;颗粒沉积;内冷通道

Abstract: In order to explore the effect of rib angle on flow and heat transfer and deposition characteristics on internal rib cooling channel of air-cooled turbine blade for marine gas turbine， ribs with seven kinds of different angles and a rib with guide vane applied in the elbow were selected as the research object， and the CFD was used for numerical simulation to analyze their performance of heat transfer and particle deposition. The results indicate that there is a great difference between the heat transfer performance in the channel and the deposition rate on the elbow wall when the rib angle is changed. When the rib angle is 45°， the heat transfer performance is the best， 25% higher than the average Nusselt number of E-type rib with the worst heat transfer performance. The deposition rate on the elbow wall and the back wall is the lowest when the rib angle is 60°. The deposition rate is the highest when the rib angle is 90°. When the rib angle is 135°， the performance of heat transfer is the worst， and the deposition rate on the elbow wall is the lowest. Change of the rib angle has no significant impact on the deposition rate for the elbow side wall and the collision rate. However， the guide vane can effectively reduce the capture rate and the deposition rate on the elbow wall， and reduce the deposition rate， collision rate and capture rate on the elbow side wall.

Key words: Marine gas turbine;Rib angle;Flow and heat transfer;Particle deposition;Internal cooling channel