Novel Aerodynamic Loss Analysis Technique Based on CFD Predictions of Entropy Production

A recently developed aerodynamic loss analysis tool is helping engineers better understand loss mechanisms and compare turbomachinery redesign concepts; these loss analysis calculations are based on GE-Aircraft Engine's Computational Fluid Dynamics (CFD) simulations. The loss analysis tool, ENPROD3D, computes the thermodynamic parameter “Entropy Production” based on flux balance calculations. As an example, GEAE's E³ High Pressure Turbine Stage 1 Blade, has been analyzed using ENPROD3D; nearly half the total entropy produced is a result of boundary layer shear, 1/3 of the entropy production is a result of trailing edge wake-related aerodynamic losses, and the remainder loss is charged to secondary flow.