Transient analysis of particle deposition characteristics in a highly loaded turbine cascade with varying blade profiles

The particle deposition process on turbine blades has the potential to compromise the service life, aerodynamic efficiency, and cooling performance of the blades. In this paper, for the first-stage high-pressure turbine guide vane of an aeroengine, User-Defined Functions (UDF) and unsteady numerical simulation techniques are used to investigate the deposition characteristics of the cascade surface under different profile parameters. In this study, two variables, leading edge diameter and stagger angle of the cascade, are set to investigate the effect of the variation of both on the surface deposition distribution, the impact efficiency, the sticking efficiency, and the capture efficiency in the turbine cascades. The results show that the 7.5 cm and 9.5 cm leading edge diameter cascades show a decrease in sticking efficiency (by about 2.3 %) and a cut in deposition of 5.0 % compared to the 5.5 cm leading edge diameter cascade. Moreover, compared with the highest sticking efficiency of 29.75° stagger angle cascade, the sticking efficiency of 32.75° stagger angle cascade is reduced by 3.4 %, and the amount of deposition particles is reduced by 7.1 %. The results reflect the significant effect of leading edge diameter and stagger angle on particle deposition behavior.