Effectiveness of Current Dynamic-Inflow Models in Hover and Forward Flight

摘要

A brief overview of dynamic inflow theory is given, including its history and its dependence on experimental data. Some of the most extensive of this data, flapping response derivatives obtained in 1972-1974, indicated that theoretical predictions which included the best dynamic-inflow models of that time were qualitatively as well as quantitatively inaccurate. In this paper, these original flapping data (some of which have never been compared to theory in the literature) are compared with theory which includes a more recently developed model of dynamic inflow. The correlation is excellent at most frequencies and advanced ratios, and the new model brings the theory into qualitative agreement with experiment in all conditions.