Abstract
The UH-60A slowed rotor wind-tunnel test data is a unique and high-quality database for the validation of rotorcraft analysis tools at high advance ratio flight conditions. The U.S. Army’s rotorcraft comprehensive analysis system, known as RCAS, incorporates several analysis options, which are evaluated for their suitability at high advance ratios. RCAS predictions of performance, controls, airloads, and structural loads are compared against high advance ratio test data. RCAS modeling options of dynamic inflow, prescribed vortex wake, yawed flow corrections, and radial drag are evaluated. The strengths and weaknesses of the analysis options are highlighted. Rotor thrust and drag predictions are in good agreement with test data, with the addition of radial drag and yawed flow models. Dynamic inflow and prescribed vortex wake performance and loads predictions provide comparable correlation; however, dynamic inflow provides the most robust convergence without numerical issues in the reverse flow region. Yawed flow corrections improve normal force correlation at inboard stations but do not improve the structural load correlation at midspan.
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