ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Aerodynamic interaction characteristics of coaxial rigid rotor⁃fuselage in hover condition
Received date: 2023-07-10
Revised date: 2023-10-20
Accepted date: 2023-12-01
Online published: 2023-12-07
Supported by
National Key Laboratory Foundation of Science and Technology on Rotorcraft Aeromechanics(61422200102)
Experimental and computation studies were conducted on the aerodynamic interaction between coaxial rigid rotor-fuselage in hover. The influence of fuselage aerodynamic interference in hover on the aerodynamic characteristics of coaxial rigid rotor and the pressure distribution on the fuselage surface was analyzed. It is found that the range of high lift areas at the tip of the upper and lower rotor blades is increased， and the power coefficient of the rotors is reduced at the same tension coefficient with the aerodynamic interaction of the fuselage. The rotor maximum Figure of Merit （FM） increases by approximately 4.6%. The fuselage generates vertical down-load， which is about 7% of the rotor pull force， with the influence of rotor downwash flow. Excluding vertical down-load on the fuselage， the maximum FM of the rotor is reduced by about 6% compared to isolated rotors. Under the aerodynamic interaction of rotor， the fuselage generates an upward force moment， which is proportional to the rotor tension coefficient. The surface pressure of the fuselage exhibits an unsteady variation of 4 times the rotational frequency.
Key words： coaxial rigid rotor; aerodynamic interaction; fuselage; wind tunnel test; hover
Pengpeng SUN , Ping’an LIU , Feng FAN , Wei ZENG . Aerodynamic interaction characteristics of coaxial rigid rotor⁃fuselage in hover condition[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2024 , 45(9) : 529284 -529284 . DOI: 10.7527/S1000-6893.2023.29284
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