Effect of Manufacturing Tolerances on the Turbine Blades

Abstract

The quantification of geometric and physical variables uncertainty impact on turbomachinery row workflow was conducted using several untwisted airfoil cascades of axial turbine nozzle blades with uniform section throughout the channel height. Profile loss coefficient, mass flow parameter, outlet flow angle were accepted as controlled performance criteria. The series of computational calculations were carried out for these cascades. The first group of calculations was aimed at the identification of the impact of geometric parameters uncertainty on nozzle blades parameters. The second group - at identifying the studied parameters depending on the flow parameters changes that are used as boundary conditions in the simulation. The obtained results showed that initial data uncertainty in CFD calculations has a significant impact on the obtained quantitative estimates. The difference between calculated data modified in accordance with the geometry technological tolerances and workflow parameters measurement error may exceed 5% by value of the considered criteria.