An Unsteady Deposition Model for Evaluating CMAS Nonuniform Deposition Behavior and Aerodynamic Performance Degradation Under Hot Streak Clocking Effect

Abstract An unsteady model has been developed for evaluating deposition behavior and aerodynamic performance degradation under the impact of hot streak. The results reveal that hot streak alters the force exerted by the mainstream, impacting the impact behavior of particles. For particles of 1 μm, total impact numbers for the uniform inlet case, vane-aligned case, and passage-aligned case are 431, 1244, and 325 on the pressure side. The hot streak clocking effect significantly affects particle temperature and deposit formation. In the vane-aligned case, the deposition mass fraction on the suction side increases from 13.8% in the uniform inlet case to 18.7%, while in the passage-aligned case, it decreases to 5.4%. Furthermore, the hot streak clocking effect leads to increased total pressure losses and a decline in aerodynamic performance, especially in the vane-aligned case. After 4000 h of deposition, the dynamic pressure loss in the vane-aligned case increases from 3.7% in the uniform inlet case to 4.3%.