Modeling for Greater Insight with Harmonic Balance
Tuesday, April 28, 2015

Multi-stage turbomachinery flow-fields are inherently unsteady. Accurately capturing unsteady flow features such as tip vortex motion and blade-row interaction is important for properly predicting machine performance and thermal profiles. Modeling these unsteady features provides greater insight into the transient nature of the system, and is also necessary for accurate prediction of time-averaged quantities such as efficiency and blade temperature.

Traditional time-marching unsteady methods are often accompanied by prohibitive expense with regard to computational cost. The harmonic balance method is able to capture unsteady flow features and blade-row interaction at a fraction of the computational cost of a traditional time-marching method.

This webcast compares results from analyzing the open literature NASA/GE E3 turbine using steady and harmonic balance solution methods. The E3 turbine is a two-stage turbine with film cooling holes present on all blade rows.

Presenters show that modeling unsteady features and blade-row interaction is critical for accurate prediction of the flow field, especially for the prediction of blade temperatures in cooled devices.

Jim Ryan
Chad Custer
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