Influence of Rim Seal on Cooling Characteristics of Downstream Rotor Blade
In order to investigate the influence of rim seal airflow on the flow field and film cooling effect of downstream rotor blade,the first stage rotor and stator blades of a heavy gas turbine were taken as the research object.The RANS equation set was solved using the SST turbulence model,and numerical stud-ies were conducted at four kinds of ratios of sealing flow rate to mainstream flow rate(MFR),including 0.25%,0.5%,0.75%and 1%.Comparative analysis was conducted on the influence of sealing flow on mainstream flow,heat transfer performance of rotor blade and vortex structure in the channel with and without leading edge film cooling conditions.The results show that the area where the sealing flow re-duces the temperature of the rotor blade endwall is within about 40%of the arc distance from the leading edge of the blade to the flow direction.The cooling efficiency of the suction surface of the rotor blade in-creases first and then decreases from the blade root to the tip direction.The position where the sealing flow improves the cooling efficiency of the suction surface of the rotor blade to the greatest extent is about 50%of the arc distance from the leading edge to the trailing edge.When there is a leading edge gas film cooling structure and MFR is 0.5%or higher,a significant cooling effect is produced on the endwall by the sealing flow.
rim sealturbine rotor bladecooling efficiencynumerical study
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