Journal of Civil Aviation University of China ›› 2025, Vol. 43 ›› Issue (1): 41-46.

• Aerodynamics • Previous Articles     Next Articles

Research on influence of geometric parameters of airfoil on aerodynamic
characteristics of ducted coaxial double rotors

YANG Yonggang a , ZHENG Wei b
  

  1. a. College of Transportation Science and Engineering; b. College of Aeronautical Engineering, CAUC, Tianjin 300300, China 
  • Received:2022-10-11 Revised:2023-02-12 Online:2025-04-09 Published:2025-04-09

Abstract:

The geometric parameters of the airfoil have a great influence on the aerodynamic characteristics of the rotor. This
article focuses on numerical simulation calculations of the ducted coaxial double rotors model, studying the influence of different geometric parameters on the aerodynamic characteristics of the rotor, in order to improve the aerodynamic efficiency of the ducted coaxial double rotors. The results indicate that increasing the airfoil camber and
the installation angle of the blade root can significantly improve the total thrust of the ducted coaxial double rotors.
When the thrust coefficient is less than 0.04, the aerodynamic performance parameters of the small camber airfoil
were higher than those of the large camber airfoil. As the thrust coefficient continues to increase, aerodynamic interference and vortex trajectory disorder occurred between the lip airflow of the duct and the tip vortex of the upper
rotor, as well as between the wakes of the double rotors. Local flow separation occurred on the inner wall surface of
the duct outlet. These are the main reasons for the rapid decline of aerodynamic performance parameters of small
camber airfoil. The aerodynamic performance parameters of the large camber airfoil change smoothly, and the aerodynamic efficiency is better than that of the small camber airfoil when the thrust coefficient is large. It is a better
choice to design the rotor with a blade root installation angle for NACA6412 between 20° to 40°.

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