Helicity of the Velocity Field in Evaluating the Efficiency of Turbomachines

Improvement of gas turbine engines (GTE) as a complex technical system requires a reliable estimate of the quantities responsible for the performance indicators of engine efficiency units. The dependence was obtained for calculating the efficiency of the turbine stage, taking into account large-scale vortex structures in the inter-path channel of the turbomachine, and validating it. It is noted that the helicity of the velocity field is equal to the decrease of the total enthalpy for adiabatic gas flows. An example is given for calculation of the efficiency of a model turbine stage taking into account the helicity of the velocity field, and its decrease is shown to be 0.15%.