This thesis focuses on developing and examining the capabilities of a new in-house
aerodynamic analysis tool, AeroSIM+, and investigating rotor-rotor aerodynamic
interactions for two helicopters, one behind the other in forward flight. AeroSIM+ is a 3-D
unsteady vortex panel method potential flow solver based on a free vortex wake
methodology. Validation of the results with the experimental data is performed using the
Caradonna-Tung hovering rotor test case. AeroSIM+ code is improved for forward flight
conditions so that, the blades are allowed to move according to the rotor dynamics. In the
simulations, blade airload prediction is seen to be sensitive to changes in vortex core size.
Blade Vortex Interaction (BVI) locations differ depending on the relative position of the rear
rotor with respect to the front rotor as well as on the forward flight speed. It was observed
that the performance characteristics of the rear rotor alter depending on the relative positions
of the rotors within the asymmetric wake flow field. The results of this thesis study such as
the computed forces and moments on each rotor and the frequency characteristics of these
loads can be also used in helicopter dynamics simulators.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/2/12611374/index.pdf |
| Date | 01 December 2009 |
| Creators | Yemenici, Oznur |
| Contributors | Oguz, Uzol |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for METU campus |
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