Research progress on particle deposition characteristics of cooling channel in gas turbine

Particle deposition in a gas turbine directly affects the cooling effect of the turbine by weakening the heat transfer in the cooling channel. The research progress of particle deposition characteristics of cooling channel in recent years has been reviewed, and the dynamical model, criterion of particle deposition and the influence of temperature, particle size, and geometry are summarized in particular. Temperature determines the deposition probability by affecting the viscosity of particles. Particle size affects the deposits distribution by changing the Stokes number. Geometry affects the deposition mechanism by changing the collision location and the number of particles. Although the sand and ash deposition of various components of gas turbines has gradually become a hot topic of research in recent years, there are still few studies on the effective suppression of particle deposition in cooling channels and how to improve the anti-deposition properties of gas turbines in practical engineering. In addition, the development of composite deposition models with better versatility and accuracy, the conduction of particle deposition experiments in high-temperature environments, and the effect of local deposition in internal channels on the blades and even the overall performance of gas turbines may be areas worth exploring in the future.