Numerical investigation on the characteristics of particle deposition in impingement-film cooling unit structures
When sand dust particles enter aero-engines and deposit on turbine blades,they pose a significant threat to safe operation of aero-engines.To explore the mechanisms governing the transport and deposition of sand dust within turbine blades,the discrete element method(CFD-DEM)was employed to conduct numerical simulation on the sand dust deposition characteristics of an impingement-film cooling unit structural model.The feasibility of applying CFD-DEM to sand dust deposition simulation was validated,and the unsteady development process of sand dust deposition on the impact target surface was revealed.The influence mechanism of the Stokes number on the sand dust deposition characteristics on the impact target surface was further clarified.The results indicate that the transport of sand dust particles within turbine blades leads to the formation of conical and banded deposition layers on the impact target surface.An increase in the Stokes number significantly reduces the entrainment capacity of sand dust particles,leading to an elevated volume fraction of sand dust particles within the flow channel.Meanwhile,the drag force exerted by the fluid on the sand dust particles decreases,ultimately resulting in an increase in the deposition mass of sand dust on the impact target surface.
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维普
