Improving the acoustic characteristics of coaxial propellers by reducing the intensity of the top vortex of the blade
DOI:
https://doi.org/10.34169/2414-0651.2021.1(29).71-76Keywords:
acoustic characteristics, coaxial fan, chevron, winglet, acoustic pressure, acoustic pressure levelAbstract
The article shows possible ways to reduce the level of acoustic radiation of the coaxial propeller fan of a turboprop fan. The analysis of noise requirements for aircraft with turboprop-fan engines is carried out. The results of previous studies on the infl uence of the main factors on the level of acoustic radiation of a coaxial screw fan are presented. Measures to improve the acoustic characteristics of the coaxial propeller fan by installing winglets and chevrons at the ends of the blades of the fi rst row of coaxial propeller fan to reduce the noise level generated by the fi nal vortices are considered. Mathematical modeling is performed in the ANSYS environment based on the solution of Navies-Stokes equations using the turbulence model SST Gamma Theta Transitional Model. The results of mathematical modeling of the infl uence of chevrons and winglets mounted on the ends of the blades of the 1st row of the fan show the possibility of reducing the intensity of the fi nal vortices of the blades and their acoustic radiation. The use of winglets on the ends of the blades of the 1st row of coaxial fan is more effective than the use of chevrons, because the winglets signifi cantly reduce the intensity of the fi nal vortex on the blades of the 1st row and reduce the impact of the 1st row vortex on the 2nd row of coaxial fan.
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