Abstract
The S-A and SST-based transition models are used to predict the aerodynamic performance of three realistic helicopter and tiltrotor blades: the XV-15 proprotor, the Joint Vertical take-off/landing eXperimental rotor, and the S-76 conventional rotor. The role of transition modeling in rotor hover predictions is investigated based on comparative studies of different models, and predicted transition phenomena are validated with the available experimental data. The focus of this chapter is to address three major issues pertinent to rotor hover predictions: (1) effect of transition modeling on the rotor aerodynamic prediction, (2) rotor predictions at high thrusts or collective angles, and (3) rotor flow characteristics and its influence on aerodynamic performance.
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