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Good hover performance is a very important rotorcraft design criteria, but despite advancements in the ability to predict and preserve the tip vortex, the limiting aspect of accurate hover performance prediction, the capability to consistently and reliably predict the performance for a new rotor-blade has not yet been demonstrated. This challenge provides the motivation for the AIAA Applied Aerodynamics Technical Committee Rotorcraft Simulation Working Group’s efforts. This paper compares and summarizes results from the AIAA 1 st Hover Invited Session at SciTech 2014, the first step to assess in a standardized fashion the different approaches by government, industry and academic participants to evaluate and further rotor-in-hover performance predictions. A baseline S-76 rotor planform was used in this first step. Comparisons of the results across the spectrum of analyses used by the participants show a prediction spread of ~3 counts in Figure of Merit and the correct trending with experimental results. The AIAA APA 2 nd Hover Session at SciTech 2015 will build on this work by refining the baseline results and adding additional tip geometries to the study as the next step of the effort. |
