Effects of slot nozzle geometry on the cooling characteristics of swirl flow
To find the optimized cooling structure of turbine blade leading edge,the swirl cooling structure with slot nozzle was established and numerical simulations with the standard k-ε turbulence model were adopted to survey the influence of slot nozzle on the flow and heat transfer characteristics of swirl cooling.Within the studied range of Reynolds number,the non-uniformity of heat transfer for the slot nozzle swirl cooling was 67.8％—71.9％lower than that of the disperse jet swirl cooling along the axial direction.Within the range of the nozzle,the heat transfer intensity of the slot nozzle swirl cooling showed an upward trend along the flow direction.The heat transfer of the bottom surface could be effectively influenced by the inclination angle of the cross-section trapezoid of slot nozzle.When the inclination angle of the cross-section trapezoid was 0.24 rad,the heat transfer intensity was uniformly distributed,and showed a downward trend when the inclination angle of the cross-section trapezoid exceeded 0.24 rad.Once the angle was larger than 0.24 rad,the heat transfer intensity decreased.The slot nozzle height had important effect on the uniformity of heat transfer of swirl cooling and the comprehensive performance was obtained when the height was 3.41 times of the diameter.In addition,the influence of width of the slot nozzle on the swirl cooling was explored.
gas turbineleading edge of bladeslot nozzleswirlcoolingflow and heat transfer
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