Aero-acoustical Study of Axial Fan using Computational Fluid Dynamics

Introduction The issue of noise pollution is one of the concerns of most societies and industries because of their relationship to the environmental comfort of life or work of people are paying attention. The Aero-acoustics not only because of government regulations on the noise pollution, but also...

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Autores principales:	B Sabralilou, A Mohebbi, E Akbarian, A Rezvanivand fanaei
Formato:	article
Lenguaje:	EN FA
Publicado:	Ferdowsi University of Mashhad 2020
Materias:	noise radiator fan computational fluid dynamics broadband noise Agriculture (General) S1-972 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/27834146fc4649b5a41513d7c74ca2f3
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id	oai:doaj.org-article:27834146fc4649b5a41513d7c74ca2f3
record_format	dspace
institution	DOAJ
collection	DOAJ
language	EN FA
topic	noise radiator fan computational fluid dynamics broadband noise Agriculture (General) S1-972 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	noise radiator fan computational fluid dynamics broadband noise Agriculture (General) S1-972 Engineering (General). Civil engineering (General) TA1-2040 B Sabralilou A Mohebbi E Akbarian A Rezvanivand fanaei Aero-acoustical Study of Axial Fan using Computational Fluid Dynamics
description	Introduction The issue of noise pollution is one of the concerns of most societies and industries because of their relationship to the environmental comfort of life or work of people are paying attention. The Aero-acoustics not only because of government regulations on the noise pollution, but also due to the increasing demand of the people's living standards and create a safe environment for farm animals is considered important. At the same time, products with high aero-acoustic performance will attract a lot of customers, which is in the interest of the global economy. Reducing current noise is often accompanied by a reduction in energy costs, resulting in durability of structures and improved product quality. Materials and Methods Sound measurements were carried out at the wind tunnel in Tabriz Tractor Engineers Company. Using the measurements performed by the instrument, the sound levels were measured at different periods of the fan. In many practical applications that include turbulent flow, no noise has any specific tone and the sound energy is continuously distributed over a wide range of frequencies. In cases where broadband noise is present, statistical disturbance values easily calculated from the RANS equations can be used in conjunction with semi-experimental correlations and audio coordination to reveal some broadband noise sources. Based on the problem, the boundary condition is the type of "input velocity" for the input and "output pressure" for the output. It was also used to move the mesh to apply the rotary motion of the fan. The thermodynamic conditions at these boundaries should be considered. Results and Discussion The accuracy of the simulation results data was verified with the measured data. In the laboratory results, the audio level is accompanied by an audio environment and an inverter and a belt that is about 15 db. With this in mind, the simulation results had a good agreement with experimental results. The velocity is a critical parameter in fan-related discussions. In the upper part of the fan, the speed of the air increases as the fan sucks, and this speed will increase as the fan approaches. In the second part, which includes the fan, for speeding objects, the speed will increase as the radius increases (due to the constant rotational speed), so the maximum speed will be at the tip of the blades. In the lower part of the fan, the speed will decrease as the fan impact decreases on the air molecules as well as the boundary layer behavior near the walls. As the speed and intensity of the turbulence are higher at the tip of the blades, hence the kinetic energy of these regions must also be higher. The kinetic energy of the turbulence in these areas is the highest. At the bottom of the fan, it is also observed that the kinetic energy of the turbulence has been relatively high, due to the existence of flow vortices that emerge from the fan period and the presence of positive and negative pressure (negative pressure due to suction of the fan center). The high pressure difference on both sides of the fluid particles causes a rotating flow in the particles, which affects the adjacent particles and causes vortex formation. Conclusions The results showed that the numerical acoustic evaluation simulates the performance of the broadband band with good results and has good agreement with the effects of the current on the noise. Increasing the recognition of the factors and their effects on the fan noise level can help to reduce the noise effects of turbo-machines. Using numerical simulations in predicting and reducing noise, in addition to time saving, dramatically reduces costs by using direct methods and mechanical design physically. With regard to all aspects and calculations, it can be concluded that acoustic numerical simulation and broadband noise model have a good ability to analyze noise in fans and rotary machines.
format	article
author	B Sabralilou A Mohebbi E Akbarian A Rezvanivand fanaei
author_facet	B Sabralilou A Mohebbi E Akbarian A Rezvanivand fanaei
author_sort	B Sabralilou
title	Aero-acoustical Study of Axial Fan using Computational Fluid Dynamics
title_short	Aero-acoustical Study of Axial Fan using Computational Fluid Dynamics
title_full	Aero-acoustical Study of Axial Fan using Computational Fluid Dynamics
title_fullStr	Aero-acoustical Study of Axial Fan using Computational Fluid Dynamics
title_full_unstemmed	Aero-acoustical Study of Axial Fan using Computational Fluid Dynamics
title_sort	aero-acoustical study of axial fan using computational fluid dynamics
publisher	Ferdowsi University of Mashhad
publishDate	2020
url	https://doaj.org/article/27834146fc4649b5a41513d7c74ca2f3
work_keys_str_mv	AT bsabralilou aeroacousticalstudyofaxialfanusingcomputationalfluiddynamics AT amohebbi aeroacousticalstudyofaxialfanusingcomputationalfluiddynamics AT eakbarian aeroacousticalstudyofaxialfanusingcomputationalfluiddynamics AT arezvanivandfanaei aeroacousticalstudyofaxialfanusingcomputationalfluiddynamics
_version_	1718429823174443008
spelling	oai:doaj.org-article:27834146fc4649b5a41513d7c74ca2f32021-11-14T06:35:26ZAero-acoustical Study of Axial Fan using Computational Fluid Dynamics2228-68292423-394310.22067/jam.v10i2.74963https://doaj.org/article/27834146fc4649b5a41513d7c74ca2f32020-09-01T00:00:00Zhttps://jame.um.ac.ir/article_34320_cea059d55d9740b9d399e67d7f793d18.pdfhttps://doaj.org/toc/2228-6829https://doaj.org/toc/2423-3943Introduction The issue of noise pollution is one of the concerns of most societies and industries because of their relationship to the environmental comfort of life or work of people are paying attention. The Aero-acoustics not only because of government regulations on the noise pollution, but also due to the increasing demand of the people's living standards and create a safe environment for farm animals is considered important. At the same time, products with high aero-acoustic performance will attract a lot of customers, which is in the interest of the global economy. Reducing current noise is often accompanied by a reduction in energy costs, resulting in durability of structures and improved product quality. Materials and Methods Sound measurements were carried out at the wind tunnel in Tabriz Tractor Engineers Company. Using the measurements performed by the instrument, the sound levels were measured at different periods of the fan. In many practical applications that include turbulent flow, no noise has any specific tone and the sound energy is continuously distributed over a wide range of frequencies. In cases where broadband noise is present, statistical disturbance values easily calculated from the RANS equations can be used in conjunction with semi-experimental correlations and audio coordination to reveal some broadband noise sources. Based on the problem, the boundary condition is the type of "input velocity" for the input and "output pressure" for the output. It was also used to move the mesh to apply the rotary motion of the fan. The thermodynamic conditions at these boundaries should be considered. Results and Discussion The accuracy of the simulation results data was verified with the measured data. In the laboratory results, the audio level is accompanied by an audio environment and an inverter and a belt that is about 15 db. With this in mind, the simulation results had a good agreement with experimental results. The velocity is a critical parameter in fan-related discussions. In the upper part of the fan, the speed of the air increases as the fan sucks, and this speed will increase as the fan approaches. In the second part, which includes the fan, for speeding objects, the speed will increase as the radius increases (due to the constant rotational speed), so the maximum speed will be at the tip of the blades. In the lower part of the fan, the speed will decrease as the fan impact decreases on the air molecules as well as the boundary layer behavior near the walls. As the speed and intensity of the turbulence are higher at the tip of the blades, hence the kinetic energy of these regions must also be higher. The kinetic energy of the turbulence in these areas is the highest. At the bottom of the fan, it is also observed that the kinetic energy of the turbulence has been relatively high, due to the existence of flow vortices that emerge from the fan period and the presence of positive and negative pressure (negative pressure due to suction of the fan center). The high pressure difference on both sides of the fluid particles causes a rotating flow in the particles, which affects the adjacent particles and causes vortex formation. Conclusions The results showed that the numerical acoustic evaluation simulates the performance of the broadband band with good results and has good agreement with the effects of the current on the noise. Increasing the recognition of the factors and their effects on the fan noise level can help to reduce the noise effects of turbo-machines. Using numerical simulations in predicting and reducing noise, in addition to time saving, dramatically reduces costs by using direct methods and mechanical design physically. With regard to all aspects and calculations, it can be concluded that acoustic numerical simulation and broadband noise model have a good ability to analyze noise in fans and rotary machines.B SabralilouA MohebbiE AkbarianA Rezvanivand fanaeiFerdowsi University of Mashhadarticlenoiseradiator fancomputational fluid dynamicsbroadband noiseAgriculture (General)S1-972Engineering (General). Civil engineering (General)TA1-2040ENFAJournal of Agricultural Machinery, Vol 10, Iss 2, Pp 255-264 (2020)

Aero-acoustical Study of Axial Fan using Computational Fluid Dynamics

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