Transactions of Nanjing University of Aeronautics & Astronautics
Normal
Parametric Effect Investigation on Aerodynamic Interaction Characteristics for Tandem Rotors in Forward Flight
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
An iterative free-wake computational method has been developed for the prediction of aerodynamic interaction characteristics between the twin rotors of a tandem helicopter. In this method, the mutual interaction effects between twin rotors as well as the rotor and wake have been included, and a rotor wake model, blade aerodynamic model and rotor trim model have been coupled during the process of solution. A new dual-rotor trim method has been presented to be suitable for the aerodynamic interaction calculations between tandem twin rotors. By the present method, the blade aerodynamic loads and rotor performance on a tandem twin-rotor in the conditions of interactions have been calculated, and the comparisons with the available experimental data have been also made to show the capability of the present method. Then, the effects of such parameters as the longitudinal separation and axial separation between twin rotors on the aerodynamic interaction characteristics have been systematically analyzed. As a result, the conclusions which can be meaningful for guiding on structure layout of the tandem rotors have been obtained. Furthermore, the rotor performance between the tandem rotors and a single rotor has been compared, and the calculated results indicate that the strongest interaction state does not appear in the hovering state, but in low-speed forward flight state.
Keywords:
Project Supported:
Clc Number:
Mobile website
