Volume 29 Issue 4
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XIA Zhen-feng, YANG Yong. Characteristic analysis of unsteady aerodynamic interactions of contra rotating open rotor[J]. Journal of Aerospace Power, 2014, 29(4): 835-843. doi: 10.13224/j.cnki.jasp.2014.04.013
Citation: XIA Zhen-feng, YANG Yong. Characteristic analysis of unsteady aerodynamic interactions of contra rotating open rotor[J]. Journal of Aerospace Power, 2014, 29(4): 835-843. doi: 10.13224/j.cnki.jasp.2014.04.013
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Characteristic analysis of unsteady aerodynamic interactions of contra rotating open rotor

doi: 10.13224/j.cnki.jasp.2014.04.013

  • National Key Laboratory of Science and Technology on Aerodynamic Design and Research, School of Aeronautics,Northwestern Polytechnical University,Xian 710072,China

  • Received Date: 2013-06-06
  • Publish Date: 2014-04-28
    Abstract
  • Unsteady aerodynamics of contra rotating open rotor (CROR) was simulated by solving unsteady Reynolds averaged Navier-Stokes equations based on dynamic patched technology. To analyze the aerodynamic interactions and slipstream flows interactions between the front-rotor and aft-rotor, a 10×10 CROR configuration was adopted and compared with the 10-bladed single rotor. Result shows that,compared with the single rotor, the thrust coefficients and power coefficients of the front-rotor decrease while those of the aft-rotor increase, with 20 periodical oscillations during one rotation period. The spectral analysis of front-rotor and aft-rotor thrust coefficients show that the fluctuations occur at even multiple numbers of blade passing frequency of single rotor, and the amplitude of aft-rotor thrust at twice the blade passing frequency is prominent. Due to the periodical passing of blade tip vortices of front-rotor, the thrust distributions on aft-rotor blade are changed and fluctuate unsteadily. Compared with the single rotor, the axial velocity increases while the cirumferential velocity decreases in the slipstream behind front-rotor. The aft-rotor accelerates the slipstream while recovers swirls.

     

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