Study Of Particle Deposition On The Plate Surface With Film Cooling

As the temperature of the pre-turbine gas increases,particulates(sand,pozzolan,debris,etc.)from the air and contaminants from the combustion of the fuel are easily softened,melted and deposited on the turbine blades.It roughens the surface of the blade,changes the shape of the blade,and reduces the aerodynamic performance of the blade.the deposition will block the film on the leaves of the leaves,reducing the cooling performance of the film,even the serious chemical corrosion of the leaf material.Therefore,it is of great importance to study the deposition rules of the turbine blade surface and the influence of deposition on the film cooling.In this paper,the molten paraffin particles sprayed into a small wind tunnel and deposited on the film to simulate the real turbine blade deposition process of pollutants,the experimental study without film cooling,the mainstream temperature of molten paraffin in the flat Surface deposition,but also observed the paraffin growth in the flat surface.In the case of film cooling,the influence of blowing ratio,jet angle,film hole diameter and the surface roughness of the slab on the paraffin deposition on the slab surface and the cooling of the slab film after paraffin deposition were also studied.Concluded as follow:(1)In the case of no film cooling,when the main stream temperature is close to the melting temperature of paraffin,the molten paraffin can be well deposited on the surface of the flat plate.As paraffin continues to grow on the surface of the plate,after reaching a certain quality and thickness,paraffin Deposition no longer increases.(2)In the case of film cooling,there is less deposition downstream of the film pores,and a “ridged” belt is formed downstream of the film pores.With the increase of the blowing ratio,paraffin deposition on the surface of the plate first increases and then decreases.With the increase of the jet angle,the paraffin deposition on the surface of the plate gradually increases.As the pore size increases,the deposition of the plate surface gradually decreases.As the surface roughness of the plate increases,the surface of the plate increases slightly.(3)In the case of film cooling,the film coolingefficiency of the plate surface after paraffin deposition is lower than the film cooling efficiency before deposition,but the change trend of the film cooling efficiency after the film hole is not significantly changed.