Particle Deposition Characteristics of U-Shaped Rib Channel of Marine Gas Turbine

In order to explore the deposition characteristics of marine gas turbine internal cooling channel, based on the particle dynamics characteristics and interaction characteristics between particle and wall of the gas extracted from the compressor into cooling channel of the cooling turbine, a deposition model is established based on the high temperature wall under the consideration of flow field, and the user-defined function is used to realize the couple of deposition model and CFD program. The internal cooling channel of marine gas turbine is simplified. Eight kinds of internal cooling structures with different downstream rib angles ( α =30°, 45°, 60°, 75° and 90° ) are selected when the angle between the film cooling hole and the wall is 90° and the downstream rib angle α is 60° with different roles between the film cooling hole and the wall ( β =30°, 45°, 60°, 75° and 90° ). The results show that when β =90° is constant, with α= 90° reduced to α= 30°, the heat transfer performance and the deposition rate of the elbow wall gradually decrease, and the impact rate of particles on the wall between downstream ribs gradually increases. The U-shaped channel with α= 60° and β =45° has the least deposition rate and the best heat transfer performance among the eight internal cooling structures. It also can effectively reduce the particle deposition in the internal cooling channel and improve the marine environment adaptability of air-cooled turbine for marine gas turbine. © 2021, Editorial Department of Journal of Propulsion Technology. All right reserved.