Optimal rotation angle selection method for variable geometry turbine of gas turbine considering economy and stability of all working conditions

The invention aims to provide the optimal rotation angle selection method for the variable geometry turbine of the gas turbine considering the economy and stability of all working conditions, a plurality of working states of the gas turbine are determined by obtaining basic operation parameters and a general characteristic curve of the gas turbine, and a plurality of relation curves of the oil consumption rate and the power of the gas turbine are obtained. And based on the rotatable guide vanes at different vane row positions and different rotating angles of the rotatable guide vanes, a relation curve of the oil consumption rate and the power of the rotatable guide vanes at each rotating angle is obtained, and an oil consumption rate and power ParetoOptimal optimal solution curve at different rotating angles is drawn. According to the method, the change rule of the oil consumption rate and the power of the gas turbine at different rotating angles of the guide vanes can be conveniently and accurately evaluated