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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2014, Vol. 35 ›› Issue (2): 417-426.doi: 10.7527/S1000-6893.2013.0246

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Comparative Research on the Dynamic Rolling Characteristics of Double Delta Wing and Wing-body Configuration

HAN Bing, XU Min, LI Guangning, AN Xiaomin   

  1. School of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2013-03-19 Revised:2013-04-28 Online:2014-02-25 Published:2013-05-17
  • Supported by:

    National Natural Science Foundation of China (11202165)

Abstract:

This paper establishes a coupled computation system which solves the Navier-Stokes equations and the rolling motion equation alternatively to obtain the rolling motion characteristics of two double delta wing models with different sweep angles and a wing-body configuration. It reveals the effect of the leading edge sweep angle and the slender body on the unsteady rolling moment, the dynamic flowfield and the transient surface pressure distribution. The results show conclusively that the energy dissipation of the merged vortex upon the windward side of the 80°/60° double delta wing is much slighter than that upon the 76°/40° model. The merged vortex energy determines the time lag effect of the dynamic flowfield and the rolling moment. The presence of a slender body dramatically enhances the amplitude of the linear component of the rolling moment. Furthermore, the upwash airstreams around the slender body enhances the suction of the strake, the merged vortex suction and its hysteresis effect. The block of the cross flow caused by the slender body enlarges the time lag of the pressure distribution on the leeward side of the main wing. In general, these results may benefit the understanding for the mechanism of the effect of the sweep angle and slender body on rolling characteristics

Key words: double delta wing, wing-body configuration, rolling characteristics, numerical simulation, hysteresis

CLC Number: