METHOD OF CONTROLLING THE GEOMETRICAL CONFIGURATION OF A VARIABLE GEOMETRY ELEMENT IN A GAS TURBINE ENGINE COMPRESSOR STAGE

The method can include determining (401) a mass flow rate W of working fluid circulating through the compressor stage, determining a control parameter value associated to the geometrical configuration of the variable geometry element based on the determined value of mass flow rate W; and changing (414) the geometrical configuration of the variable geometry element in accordance with the determined control parameter value.