The relative merits of three of the most advanced hover performance prediction codes have been assessed by comparing with experimental data. The experimental basis for this comparison is an extensive set of loads, wake and performance data, which were obtained from a pressure instrumented model UH-60A rotor tested at the Sikorsky hover test facility and at the Duits-Nederlandse Windtunnel (DNW). This model was equipped with replaceable tips - including a tapered and a BERP-like tip - which permitted studies of the effects of rotor geometry. It is found that the EHPIC code produces better comparisons with the data that includes wake geometry and rotor performance. The HELIX-I code performs equally well as long as the flow remains unseparated. The performance by the TURNS code is reasonable, although the wake geometry is not accurately predicted. Comparisons with the predicted induced and profile torque distributions have permitted an improved understanding of the performance of each tip. In addition to code accuracy studies, the effects of planform variations on hover performance are investigated.
Evaluation of hover performance prediction codes
Die Ermittlung einer Prognose für das Leistungsverhalten von Hubschraubern im Schwebeflug
Forum, Annual Forum, American Helicopter Society, 50 ; 2 ; 829-844
1994
16 Seiten, 12 Bilder, 13 Quellen
Conference paper
English
Hover performance prediction using CFD
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