Effect of Outlet Width of the Dovetail Hole on the Film Cooling Characteristic with Compound Angle Jet
The film effectiveness of dovetail holes with different outlet widths on the suction surface of turbine blades at different blowing ratios was studied by using numerical simulation method.The results demonstrate that the numerical results are in good accord with the experimental data,in which the aver-age error is less than 20％.The unevenness of velocity in the spanwise direction of the dovetail hole out-let increases with the increase of outlet widths,which is adverse to the spread of the jet and reduces the film effectiveness.As the blowing ratio increases,the film effectiveness of the dovetail hole decreases more significantly with the increase of outlet width.At the blowing ratio of 1.0,the film effectiveness of the dovetail hole with an outlet width of 1.5d is 13％higher than that of the dovetail hole with an outlet width of 2.0d.When the outlet width increases from 2.0d to 2.5d,the difference of film effectiveness is less than 1％;at the blowing ratio of 1.5,the film effectiveness of the dovetail hole with an outlet width of 1.5d is increased by 40％and 51％,compared with those of the dovetail holes with an outlet width of 2.0d and 2.5d;at the blowing ratio of 2.0,the film effectiveness of the dovetail hole with an outlet width of 1.5d is 38％and 62％higher than those of the dovetail holes with an outlet width of 2.0d and 2.5d.
film coolingoutlet widthcompound anglefilm effectiveness
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