Scientists published the results of the study in the journal AIP Conference Proceedings (1, 2). The developers are implementing the project with funds from the President of the Russian Federation grant in the amount of 1.2 million rubles, which they received in 2021, and the Russian Foundation for Basic Research grant. In 2022-2024, scientists also plan to carry out a series of works with the support of UEC Aviadvigatel JSC. Scientists have already patented the invention.
In 2021, scientists Igor Khramtsov and Oleg Kustov became laureates of the II degree of the Perm Krai Prize in the category "Technical Sciences".
To reduce the noise of an aircraft engine, its channels are sheathed with sound-absorbing structures. The effectiveness of their work depends on how optimally selected the values ??of the acoustic characteristics. Now these parameters are determined using semi-empirical methods. These computational models are based on a simplified description of physical processes and do not take into account complex phenomena in aircraft engines, for example, the formation of vortices in panel openings. In addition, calculations are performed for single-layered and simplified structures, and multilayer and combined ones are used in airplanes. Experimental methods also do not provide high data accuracy, the scientists explain.
— Creation of low-noise, streamlined airliners with the quietest engines and efficient sound-absorbing structures is an urgent task for aircraft manufacturers. Our research team has developed and successfully implemented a methodology that will make it possible to more effectively predict the acoustic performance of sound-absorbing linings in aircraft engines. At the same time, for the first time, it was possible to simulate the processes for real structures that are used in aircraft construction, — says Oleg Kustov, a Research Assistant at the Laboratory of Noise Generation Mechanisms and Modal Analysis at the Center for Acoustic Research of the Perm Polytech University.
Numerical simultion allowed researchers to refine the acoustic characteristics of engines, develop new experimental methods, and improve the verification of calculation results. The technology will allow taking into account various complex phenomena - for example, the spread of sound in the cells of sound-absorbing structures and processes occurring at high levels of sound pressure.
According to the researchers, the development can be used not only in the creation of advanced aircraft engines, but also in active noise control for power plants and gas pumping units.