The Results of Numerical Research of High-Temperature Flow Heterogeneity Caused by Edge Wakes of Nozzle Blades with Film Cooling

Ensuring the vibrational reliability of turbomachinery blading is one of the main objectives in turbine manufacturing. Rotor blade vibrations are often the result of the flow heterogeneity caused by the edge wakes of nozzle vanes. This problem is of paramount importance in prospective steam and gas turbines that operate at ultrahigh temperatures of the working fluid. However, there is no information in the literature on the effect of the method of nozzle vane cooling on the heterogeneity of the stream behind the blades. The effect of film cooling of the plane lattice of nozzles on the heterogeneity of the high-temperature flow caused by edge wakes behind the lattice is investigated in a two-part study. In the first part, the authors compare the flow heterogeneity behind the lattice with and without cooling. In the second part, the influence of the film cooling system design on the value of the flow heterogeneity is studied. The numerical experiment is carried out in the STAR-CCM + v9.02.005 software environment. The calculations have shown that the method of profile cooling has a significant impact on the heterogeneity of the high-temperature flow. The results obtained can be used to develop advanced designs of steam and gas turbines.

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