Title of Paper:Experimental investigation of wing-body rock with nonzero equilibrium roll angles

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Affiliation of Author(s):航空学院

Journal:PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING

Key Words:Wing-body rock canard wing nonzero equilibrium roll angle abruptly jumping flow visualization

Abstract:To study wing-body rock, various tests were used for the canard-configuration models in the wind tunnel, including free rolling, disturbance on free rolling, static moment measurements, dynamic derivative measurements, smoke wire method and particle image velocimetry. The models also have a chine forebody, strake wings, main wings and a vertical tail. In the tests, the canard deflection angles are 0 degrees and 20 degrees relative to the axis of the body. First, the roll angle time histories were obtained by free rolling motion and disturbed motion; the results demonstrate that both canard-configuration models have nonzero mean roll angles. In particular, the existence of the other larger nonzero mean roll angles on the same side is a curious aspect at the critical pitch angle, such as at =37 degrees for the model with canard deflection of 20 degrees. Next, static moment tests and dynamic derivative tests demonstrate that although the roll angle time histories are non-limit cycle motions, they are irregularly self-excited oscillation under the influence of multi-vortex structures. Finally, the constituent parts of structures over wing bodies and the flow mechanism of abruptly jumping from an equilibrium roll angle to the other on the same roll side were revealed by the smoke wire and particle image velocimetry measurements.

ISSN No.:0954-4100

Translation or Not:no

Date of Publication:2018-03-01

Co-author:魏德宸,Geng Xi,XT21693

Correspondence Author:szw