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Оценка влияния диаметра воздушного винта на акустические характеристики силовой установки легкого самолета.

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Vestnik SibGAU
Vol. 17, No. 1, P. 154–160
EVALUATION OF THE INFLUENCE OF DIAMETER PROPELLER
ON THE ACOUSTICS CHARACTERISTIC OF THE POWER PLANT BY THE LIGHT AIRCRAFT
P. A. Moshkov*, V. F. Samokhin
Central Aerohydrodynamic Institute named after N. E. Zhukovsky
1, Zhukovsky Str., Zhukovsky, Moscow Region, 140180, Russian Federation
*
©-mail: moshkov89@bk.ru
The article presents the results of the performed computational and experimental studies of the influence of the
propeller diameter on the acoustic characteristics of the power plant (PP) by the light aircraft to determine the method
of community aircraft noise reduction of this class of aircraft by changing the diameter of the propeller while
maintaining the aerodynamic and geometric similarity and propellers invariance of the rotation frequency.
The experimental method is based on a comparative analysis of the measured under static conditions of acoustic
characteristics by the power plants of light propeller aircraft MAI-223M and F30, differing only in the propeller
diameter and thus tip speeds at a constant frequency of rotation propellers. Calculated estimate is based
on semiempirical method for calculating propellers noise. As a result of the research it has been found that a slight
decrease in the diameter of the propellers on the 3.3 % leads to the reduce of the total noise power plant light aircraft
by 1.5 dB. At the same time the estimated value of the expected reduction of tonal loading propeller noise is 1.2 dB.
154
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The difference between the calculated and experimental data is explained by the fact that the calculation does not take
into account the thickness noise. Based on semiempirical model propeller noise ratio is obtained to determine the effect
of the propeller diameter on the load propeller noise on the condition of the geometric and aerodynamic similarity
propellers, and at a constant rotation frequency. Comparison of sound power levels of high-frequency broadband
radiation (1000–5000 Hz) PP aircraft MAI-223M and F30, with aerodynamically similar propellers of different
diameters, showed that the difference in the sound power level may be related not only to the difference in the diameter
of the propellers but the presence of other sources of noise generation related to the arrangement of the power plant for
propeller aircraft (particularly wrap inductive flow from the propeller the inlet oil cooler of the engine).
Keywords: propeller noise, propeller power plant noise, light propeller aircraft noise, community aircraft noise.
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