Propeller-driven light aircraft power plant noise Integral model

Aeronautical and Space-Rocket Engineering

Thermal engines, electric propulsion and power plants for flying vehicles


Аuthors

Moshkov P. A.1*, Samokhin V. F.2**

1. Yakovlev Corporation Regional Aircraft Branch, 26, Leninskaya Sloboda str., Moscow, 115280, Russia
2. Central Aerohydrodynamic Institute named after N.E. Zhukovsky (TsAGI), 1, Zhukovsky str., Zhukovsky, Moscow Region, 140180, Russia

*e-mail: moshkov89@bk.ru, p_moshkov@ssj.irkut.com
**e-mail: samohin_vf@mail.ru

Abstract

The extensive development of small and unmanned aircraft together with existed requirements to permissible levels of noise generated by aircraft, make the noise prediction problem afield topical for prospective aircraft with engine-propeller power plant. The main source of noise afield created by aircraft of such kind is a power plant, consisting of single propellers of various design and configuration, and piston engines.

This work integrates and develops the authors’ previously developed methods of computing separate propeller noise and the piston engine noise for solving the problem of forecasting the characteristics of light aircraft and unmanned aerial vehicles power plants’ total acoustic field.

The authors suggest a semi empirical model for noise levels, generated by aircraft piston engines in the far field, evaluation with allowance for main noise sources. The acoustic field is considered as a superposition of fields, formed by propeller and piston engine noise radiation. For propeller audio frequency levels estimated evaluation implementation of semi empirical method developed earlier by the authors is recommended. To determine propeller’s vortex noise levels, presumably dominant in the broadband noise of tractor propellers, we propose to use one of analytical models of the trailing edge noise. To calculate the acoustic performance of the piston engine we suggest to use an empirical noise model.

The paper demonstrates close agreement between computed and experimental data on power plants with tractor propellers. Experimental data on power plants noise was obtained during light aircraft of An-2, Yak-18T, MAI-223M and F30 acoustic trials under static conditions at the Moscow Aviation Institute airbase. The acoustic field herewith was supposed axisymmetric relative to the propeller axis, while test microphones were located at the ground level. It allowed exclude the interference of sound impact on measured noise levels.

The future trends of the study concerning improvement of the above mentioned method and extension the area of its application were formulated.

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Keywords:

a propeller, propeller noise, piston engine noise, power plant noise, aeroacoustics, aircraft noise, unmanned aerial vehicle noise

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