The uneven outlet temperature of the combustion chamber can lead to the phenomenon of hot streak (HS) at the turbine inlet. To investigate the effect of HS inlet on the particle deposition of high temperature turbine, user defined function is used to write the corresponding deposition model. Simulation is conducted on the deposition inside a high temperature turbine cascade. The surface morphology caused by deposition is realized by dynamic mesh technology. Deposition phenomena with and without constant wall temperature are compared. The interaction between jet and deposition is explored with film cooling condition. The result shows that the elliptical HS inlet has the most significant effect on reducing deposition. Non-deposition zones are formed because of high temperature at the center of blades. Constant temperature inlet has the highest deposition particle number, approximately 1 × 106. The influence of elliptical HS facing the blade is severe. Non-deposition zones disappear or get weaken because of film. The main regions of cooling effectiveness change before and after deposition are at the leading edge. The loss of cooling effectiveness can reach 6.2% at the trailing edge. Jet has a promoting effect on deposition under HS inlet in most regions.
Zhang et al. (Tue,) studied this question.