TD2 Axial Turbine Design and Performance code TD2 performs a streamline analysis that can use meridional velocity gradients to control the radial distribution of work and flow for multistage, multishaft, cooled or uncooled, axial-flow turbines. The effects of streamline slope and curvature are included in the radial equilibrium. Hub and tip radii are specified at inlet, exit, and between each blade row. The velocity diagrams for each stage can be individually controlled. The purpose of this code is to predict tone noise emanating from a fan stage including the effects of reflection and transmission by the rotor and stator and by the duct inlet and nozzle.
All stages have the same stator exit angle.
Stage by stage tailoring of the velocity diagrams is not allowed. Only inlet and exit diameters are input, and continuity is performed only at the first-stage exit and turbine exit. The loss model is a simple viscous type related to the velocity diagrams.