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Figure 6: Time series of individual blade thrust and the total thrust (divided by four) (top), and individual blade passages and phase average over one revolution of the previous data (bottom).
  
From:
Application: Simulation of Unsteady Propeller Blade Loads Using OpenFOAM
Posted Fri June 13, 2014 @02:44PM
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Application By Prof. Rickard E. Bensow
Department of Shipping and Marine Technology
Chalmers University of Technology
Gothenburg, Sweden

Unsteady propeller blade loads are important to consider in the design of the propulsion system in order to avoid problems with noise and vibrations. This is normally done through an analysis of the average wake field flowing into the propulsor in order to correctly match the different components of the propulsion system. As computational resources increase, it starts to become possible to better study the impact on the natural wake flow unsteadiness and how this influences the behavior of the propeller.

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