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Journal articles on the topic 'Axial fan noise'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Lauchle, Gerald C., John R. MacGillivray, and David C. Swanson. "Active control of axial-flow fan noise." Journal of the Acoustical Society of America 101, no. 1 (January 1997): 341–49. http://dx.doi.org/10.1121/1.417979.

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2

Kang, Jongmin, and Seungchul Park. "Source modeling for the axial fan noise." Journal of the Acoustical Society of America 101, no. 5 (May 1997): 3189. http://dx.doi.org/10.1121/1.419234.

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3

Capdevila, Hugo. "High efficiency, low-noise axial fan assembly." Journal of the Acoustical Society of America 102, no. 1 (July 1997): 22. http://dx.doi.org/10.1121/1.419532.

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4

MacGillivray, John R., Gerald C. Lauchle, and David C. Swanson. "Active control of axial‐flow fan noise." Journal of the Acoustical Society of America 98, no. 5 (November 1995): 2885. http://dx.doi.org/10.1121/1.413142.

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5

Piper, George E., John M. Watkins, and Owen G. Thorp. "Active Control of Axial-flow Fan Noise Using Magnetic Bearings." Journal of Vibration and Control 11, no. 9 (September 2005): 1221–32. http://dx.doi.org/10.1177/1077546305057261.

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In this paper we present a novel approach to reducing blade-rate noise of axial-flow fans. By using magnetic bearings as a noise control actuator, it is possible to collocate the anti-noise source with the disturbance noise source. This approach allows for global noise reduction throughout the sound field. A DC motor connected to a fan by a short rigid shaft was used to demonstrate this approach. The shaft was supported in the radial and axial directions by magnetic bearings. The bearings provide position control of the shaft and fan; this position control can be used to vibrate the fan at a desired frequency and amplitude. Controlled vibration of the fan allows its use as a speaker in an active noise control scheme. Noise control was implemented on a dedicated digital signal processor using a least mean square algorithm. The output of the noise control algorithm supplies the position commands for the magnetic bearing controller. Experimental data showed that by actuating the axial thrust bearing, the noise output of a fan could be reduced by 4 dB at the error microphone, and 3 dB at points away from the error microphone.

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6

Chun, Guo, Wang Mingnian, and Tang Zhaozhi. "A Study on Surge and Stall under the Interaction of Parallel Axial flow fan in Tunnel." Noise & Vibration Worldwide 42, no. 11 (December 2011): 9–14. http://dx.doi.org/10.1260/0957-4565.42.11.9.

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In the ventilation design for tunnels above 10km, an axial flow fan of great power needs to be set in ventilation shafts. There are few provisions on the setting modes and less discussion of parallel axial flow fan mode in the Specifications for Design of Ventilation and Lighting of Highway Tunnels. All of these bring a lot of difficulties about the axial fan selection, layout and control design. There is no specialized research on axial flow fan for tunnels and no studies on surge and stall under the interaction of parallel axial flow fan in tunnel in spite of the more and more application of parallel axial flow fan. So, this paper conducts a study on surge and stall under the interaction of parallel axial flow fan in tunnels. Through the study on the operating principle and analysis of parallel axial flow fan, we can know that the noise will increase suddenly, which will in turn result in fan vibration and running instability once the stall occurs. When a fan surges, the air volume and pressure, the motor current will fluctuate sharply, which brings significantly increased vibration and noise. At the same time, the rotary blade and the shell are subject to considerable stress effects and the fan will possibly suffer from great damage. The surge will occur in the unstable zone of axial fan performance curve. The strong pulsation and periodic oscillation of the air flow will increase the noise, which is a serious damage to the fan. So an axial fan should avoid this zone in running. With two axial flow fans of the same power parallel, the mutual influence is not very great. Therefore this research will focus on the efficiency in the case of two fans with a high and a low power parallel. Stall will occur if the outside pressure is greater than the outlet pressure. Once the stall happens, the noise will increase suddenly, which will in turn result in fan vibration and running instability. When two fans parallel, i.e. when the power ratio of the parallel fans is over 5.3, the possibility of the small fan's stall is high, otherwise it is small. With regard to the running efficiency of parallel axial flow fans and the starting safety, it is better to parallel two fans, and the fans with adjustable movable vanes or frequency control or the ordinary nonadjustable fans can be used.

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7

Chang, Cheng-Yuan, Xiu-Wei Liu, Sen M. Kuo, Department of Electrical Engineering, Chung Y, Department of Electrical Engineering, Chung Y, Department of Electrical Engineering, Chung Y, Department of Electrical Engineering, Chung Y, and Department of Electrical Engineering, Chung Y. "Active noise control for centrifugal and axial fans." Noise Control Engineering Journal 68, no. 6 (November 1, 2020): 490–500. http://dx.doi.org/10.3397/1/376840.

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Fans are widely used in industry for heat dissipation or airflow production. It is achieved by driving a motor of fan to rotate a number of blades. Most industrial fans can be categorized into one of two general types: centrifugal fans and axial fans. However, fan noise is loud when the motor speed is high. This article develops using active noise control (ANC) system to reduce noise from both centrifugal and axial fans. By integrating loudspeakers and microphones, we present multiple-channel feedback ANC structure with the filtered-X least mean square (FXLMS) algorithm to simultaneously reduce noise from the inlet and the outlet of the fans. Several realtime experiments verify that the proposed method and experimental setup not only reduces the narrowband noise but also achieves the global cancellation of the fan noise.

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8

Gallivan, William P. "High efficiency, low axial profile, low noise, axial flow fan." Journal of the Acoustical Society of America 97, no. 5 (May 1995): 3221. http://dx.doi.org/10.1121/1.411808.

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9

Hunnaball, P. J. "Control of Axial Flow Fan Noise by Design." Building Acoustics 1, no. 4 (December 1994): 271–78. http://dx.doi.org/10.1177/1351010x9400100402.

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This paper discusses the present methods of controlling tonal noise in axial flow fans and puts forward some basic parameters for use in the design and selection of this product. Descriptions are given of the effects of fan casing geometry, the interaction of fixed duct elements and fan rotating parts, the effect of inlet disturbance and changes in noise level with radial clearance. Finally, guidelines are given for users of axial How fans in order to minimise noise levels.

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10

Li, Guoqi, Lifu Zhu, Yongjun Hu, Yingzi Jin, Toshiaki Setoguchi, and Heuy Dong Kim. "Influence of Chord Lengths of Splitter Blades on Performance of Small Axial Flow Fan." Open Mechanical Engineering Journal 9, no. 1 (June 25, 2015): 361–70. http://dx.doi.org/10.2174/1874155x01509010361.

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On the basis of small axial fan with five blades, 6 types of small axial flow fans with different chord lengths splitter blades were designed. Numerical simulation of 6 fan models with splitter blades and prototype fan were done by using Fluent. Based on the obtained simulation results, internal flow characteristics and aerodynamic noise were analyzed and compared. It indicates that: splitter blades with suitable chord length have improved significantly on internal flow characteristics, which inhibits backflow from pressure surface to the suction surface at blade tip and leading edge and restrains flow separation. The 6 model fans are better than prototype fan on aerodynamic noise improvement, but too long or too short chord lengths are both disadvantage to improve aerodynamic noise. The results reveal that 2/6, 3/6 and 4/6 chord length model have relatively better acoustic characteristics and internal flow characteristics. The research program will offer a reference for structural improvements and noise reduction on small axial flow fan.

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11

Yang, Xinglin, Chenhui Wu, Huabing Wen, and Linglong Zhang. "Numerical simulation and experimental research on the aerodynamic performance of large marine axial flow fan with a perforated blade." Journal of Low Frequency Noise, Vibration and Active Control 37, no. 3 (July 6, 2017): 410–21. http://dx.doi.org/10.1177/0263092317714697.

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In this study, some of the optimal parameters for a new-style marine axial flow fan are defined by using numerical simulation and experimental tests with a large marine axial flow fan, based on the analysis of the blade perforation’s influences on its internal flow field and aerodynamic noise characteristics. Test result shows that the noise reduction for the axial flow fan with perforated blade is about 3 dB when the blade perforation diameter D is 10 mm and its deflection angle α is 45°. The results of the study show that there is an inhibitory effect on the discrete noise of axial flow fan with perforated blade on the tip area, and its total noise level emerged as the fluctuated distribution characteristics with the increase in the perforation diameter D and reduced along with the increase in the deflection of perforation angle α, at the same time varied as a linear characteristics, which can be reasonably explained by the acoustic interference theory. The results of the study have also further confirmed that the improvement of the flow of axial flow fan with perforated blade helps to reduce the pressure pulsation amplitude caused by the turbulence of the blade surface boundary layer, thereby suppressing the back-flow and vortex from the pressure surface to the suction surface efficiently. It is indicated that the improved vortex shedding phenomenon at the blade trailing edge after perforation on the area of blade tip is the main reason for the aerodynamic noise reduction of axial flow fan.

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12

Seshagiri Rao, G. V. R., V. V. Subbarao, and C. Prabakara Rao. "Numerical and Experimental Study of Cooling Fan Noise." Applied Mechanics and Materials 592-594 (July 2014): 1930–34. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1930.

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Abstract. This paper presents the results of experimental studies of the noise of marine application pump axial flow fan. Axial flow fan is verified by both geometrical and experimental approaches. This section includes grid system used in geometric simulation, and boundary conditions. In order to know the complicate and complex physical features of an axial flow fan, a commercial computational fluid dynamics code, FLUENT, is utilized to perform the flow field analysis, which solves the Navier–Stokes equation using an amorphous finite volume-method. As a commercial computational fluid dynamics code, FLUENT has been extensively used in many turbo machinery applications. In this paper the noise predicted according to geometrical results will be compare with investigational results.

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13

Wu, Jian-Da, and Mingsian R. Bai. "A Ring Silencer Design for Reducing Noise of Axial Fan." Fluctuation and Noise Letters 03, no. 03 (September 2003): L259—L264. http://dx.doi.org/10.1142/s0219477503001348.

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In this paper, a ring silencer design for reducing the noise of axial fans is presented. The noise sources on axial fans are usually caused by the fluctuating pressure distribution on the surface of fan blade. Most of the sources are near the trailing edge of blades or boundary region of blades. The ideation of proposed design is based on the principle of Helmholtz resonator for reducing the noise around the fan. The electro-acoustic analogy of this design is presented and simply discussed. Experimental measurement is carried out to evaluate the proposed design for reducing the axial fan noise. The result of experiment indicated that the ring silencer achieved 17 dB in blade passing frequency and 10 dB in other broadband frequency of power spectrum level.

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14

Wu, Juan, Ziming Kou, and Jing Liu. "The Acoustical Behavior of Contra-Rotating Fan." Mathematical Problems in Engineering 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/3739067.

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The noise produced by a contra-rotating ventilator can cause injury to humans. Therefore, it is important to reduce noise caused by ventilators. In this study, the Ffowcs Williams and Hawkings (FW-H) model was used to simulate the acoustics of four different axial impeller spacing points based on the unsteady flow field through a FBD No. 8.0 contra-rotating ventilator. Experiments were conducted to verify the correctness of the numerical model. Meanwhile, the Variable Frequency Drive (VFD) drives the two motors of 55 kW to give the impellers different speeds to distinguish different conditions. The results showed that the main noise source of the ventilator was the two rotating impellers and the area between them. For the same axial space, the noise decreased with the increase of flow rate and then decreased. And the amplitude of the discrete pulse increased gradually. It can be concluded that the vortex acoustics decreased gradually with the increase of flow rate and the rotating acoustics were the major contributor. With the axial distance increasing, the noise caused by the two impellers was weak, and the frequencies of sound pressure level moved toward medium- and low-frequency bands gradually. The suitable axial space could reduce noise and improve the working environment.

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15

Kalmár-Nagy, Tamás, Bendegúz Dezső Bak, Tamás Benedek, and János Vad. "Vibration and Noise of an Axial Flow Fan." Periodica Polytechnica Mechanical Engineering 59, no. 3 (2015): 109–13. http://dx.doi.org/10.3311/ppme.7948.

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16

Carolus, Thomas, Marc Schneider, and Hauke Reese. "Axial flow fan broad-band noise and prediction." Journal of Sound and Vibration 300, no. 1-2 (February 2007): 50–70. http://dx.doi.org/10.1016/j.jsv.2006.07.025.

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17

Sommerfeldt, Scott D., and Kent L. Gee. "Active control of axial and centrifugal fan noise." Journal of the Acoustical Society of America 133, no. 5 (May 2013): 3264. http://dx.doi.org/10.1121/1.4805285.

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18

Hoover, K. Anthony. "Axial fan noise reduction by improved inlet conditions." Journal of the Acoustical Society of America 89, no. 4B (April 1991): 1970. http://dx.doi.org/10.1121/1.2029718.

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19

Hayashi, K., S. Nakaye, and S. Nishimura. "Lattice Boltzmann Simulation of Industrial Axial Fan Noise." Journal of Physics: Conference Series 1909, no. 1 (May 1, 2021): 012011. http://dx.doi.org/10.1088/1742-6596/1909/1/012011.

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20

Akaike, S., and K. Kikuyama. "Noise Reduction of Pressure Type Fans for Automobile Air Conditioners." Journal of Vibration and Acoustics 115, no. 2 (April 1, 1993): 216–20. http://dx.doi.org/10.1115/1.2930333.

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Automotive air conditioners often employ a pusher-type condenser cooling system. Because the axial fan in such cooling systems is a major source of noise in the engine compartment, much effort has been directed to reducing the noise emitted by the fan. This paper clarifies the mechanism by which the fan of a pusher-type cooling system generates noise and presents ways to decrease the turbulent noise from it. Detailed studies of the flow around the fan were made using computer simulations and LDA (Laser Doppler Anemometer) measurements. A considerable reduction in the noise level of pusher-type cooling system has been achieved for different resistances without any deterioration in performance.

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21

V.S., Dmitriev, Kostyuchenko T.G., Minkov L.L., Derdiyashchenko V.V., and Panfilov D.S. "VIBROACTIVITY OF LOW-NOISE FANS." Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, no. 68 (2020): 61–71. http://dx.doi.org/10.17223/19988621/68/6.

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Low-noise fans are widely used in the sphere of human life for sanitary and technological purposes. Creation of low-noise fans is currently an advanced scientific and technical area. In some fields of their application, reduced vibrations and noises are of paramount importance not only in terms of sanitation and health, but also from a scientific point of view. This work presents a comparison of the quality of low-noise fan development depending on the selected resistance type. The efficiency of the damping of mechanical system (a low-noise fan) vibrations according to the type of resistance moment used is confirmed analytically and practically. Nowadays, a number of fan types implemented in hundreds of designs have been developed and are in service. In this work, the whole variety of the produced nomenclature of low-noise fans is reduced to two basic types – axial and radial. The paper reports that to ensure minimum noise in the operating mode of the low-noise fans presented in the work, a wideband vibration damper is needed as a required functional unit, and the walls of the fan housing should be sandwich-like with layers made of sound absorbing, sound insulating, and vibration damping materials.

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22

Gee, Kent L., and Scott D. Sommerfeldt. "Multi-channel active control of axial cooling fan noise." Journal of the Acoustical Society of America 111, no. 5 (2002): 2453. http://dx.doi.org/10.1121/1.4778456.

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23

Herold, Gert, Florian Zenger, and Ennes Sarradj. "Influence of blade skew on axial fan component noise." International Journal of Aeroacoustics 16, no. 4-5 (July 2017): 418–30. http://dx.doi.org/10.1177/1475472x17718740.

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Microphone arrays can be used to detect sound sources on rotating machinery. For this study, experiments with three different axial fans, featuring backward-skewed, unskewed, and forward-skewed blades, were conducted in a standardized fan test chamber. The measured data are processed using the virtual rotating array method. Subsequent application of beamforming and deconvolution in the frequency domain allows the localization and quantification of separate sources, as appear at different regions on the blades. Evaluating broadband spectra of the leading and trailing edges of the blades, phenomena governing the acoustic characteristics of the fans at different operating points are identified. This enables a detailed discussion of the influence of the blade design on the radiated noise.

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24

Chiu, Wen‐Shyang, G. C. Lauchle, and D. E. Thompson. "Subsonic axial flow fan noise and unsteady rotor force." Journal of the Acoustical Society of America 85, no. 2 (February 1989): 641–47. http://dx.doi.org/10.1121/1.397589.

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25

Mo, Jang-oh, and Jae-hyuk Choi. "Numerical Investigation of Unsteady Flow and Aerodynamic Noise Characteristics of an Automotive Axial Cooling Fan." Applied Sciences 10, no. 16 (August 6, 2020): 5432. http://dx.doi.org/10.3390/app10165432.

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Low-speed axial cooling fans are frequently used to manage engine temperature by ensuring that adequate quantities of air pass through heat exchangers, even at low vehicle speeds or in the idle condition. This study aims to provide a better understanding of the unsteady flow behavior around an automotive axial cooling fan with seven blades and its impact on the aerodynamic noise generation. Large Eddy Simulation (LES) near the near-field region and the Ffowcs-Williams and Hawkinbygs (FW-H) method were performed to analyze the flow characteristics around the fan and predict the aerodynamic noise emitted from the fan under a constant rotational speed of 2100 rpm. The simulation results for the velocity distributions and aerodynamic noise were compared with the experimental data measured by single hot-wire probe and in a dead-sound room. The results showed a comparatively good agreement upstream and downstream from the fan and at two different receivers of 0.5 m and 1.0 m. When the fan was rotating, a strong tonal noise numerically existed near the leading edge of the blades at the tip and amounted to 110 dB sound pressure level (SPL) caused by the increasing angles of attack with the increasing radial velocity near the ring, which caused the entire air foil to emit a low-frequency noise. Furthermore, the different SPL decay characteristics of approximately 5 dB in the near-field region and 6 dB in the far-field region were observed each time the distance from the fan doubles. The findings of this research can provide important insights into the design of axial fans with low noise and high performance.

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26

Čudina, M. "Noise generation in vane axial fans due to rotating stall and surge." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 215, no. 1 (January 1, 2001): 57–64. http://dx.doi.org/10.1243/0954406011520517.

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A characteristic of axial flow fans is instabilities in their performance and noise in partial load operation. These instabilities are a consequence of rotating stall created in the rotor blade and/or in the guide vane cascade. At some operating conditions the rotating stall caused the appearance of a surge representing the lowest region of fan operating stability. The rotating stall and especially surge caused a steep increase in the emitted noise and lowered the performance of the fan. The present paper highlights the rotating stall generation phenomenon and its influence on the emitted total noise level and noise spectra for axial flow fans with inlet and outlet guide vanes.

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27

AKAIKE, Shigeru, Koji KIKUYAMA, Motohiro KITADA, and Kazutoshi KUWAYAMA. "Study of Rotational Noise Reduction for Axial Flow Fan. (Analysis and Estimation of Secondary Fan-Noise Component)." JSME International Journal Series B 39, no. 3 (1996): 590–96. http://dx.doi.org/10.1299/jsmeb.39.590.

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28

Zhang, Li, and Ying Zi Jin. "Effect of Blade Numbers on Aerodynamic Performance and Noise of Small Axial Flow Fan." Advanced Materials Research 199-200 (February 2011): 796–800. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.796.

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To more fully explore the effect of blade numbers on aerodynamic performance and noise of small axial flow fan, some solutions are adopted to obtain the parameters’ distribution of the flow field.Firstly, the standard k-ε turbulence model is used to calculate the steady flow field of six different fan blades(such as 5,7,9,11,13,15) , and the SIMPLE algorithm is applied to couple vecolity and pressure. Secondly, the large eddy simulation in conjunction with the FH-W noise model are used to compute the unsteady flow field and noise. Finally, the experimental results verify that the calculation methods of steady flow field and unsteady flow field are correct. The conclusions show: (1)Total pressure and efficiency generally maintain the trend of firstly increasing and then decreasing with increasing the blade numbers, and it is the greatest when fan blade number is 11. The flow rate coupled with the maximum efficiency has never changed with increasing the blade numbers. (2)With the increasing blades, overall sound pressure level of the aerodynamic noise is gradually decreasing near the outlet of fan tip, while it is firstly decreasing and then increasing before decreasing again 1 meter away from the central axis of the impeller along the outlet. When fan blade number is 11, overall sound pressure level of the aerodynamic noise is the greatest.

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29

Zhu, Tao, and Thomas H. Carolus. "Axial fan tip clearance noise: Experiments, Lattice–Boltzmann simulation, and mitigation measures." International Journal of Aeroacoustics 17, no. 1-2 (February 24, 2018): 159–83. http://dx.doi.org/10.1177/1475472x17743627.

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The effect of tip clearance in an axial fan on its aerodynamic and aeroacoustic performance is investigated experimentally as well as via a Lattice–Boltzmann flow simulation method. An increase in tip clearance degrades fan pressure rise and efficiency, but also increases significantly the overall sound power emitted by the fan. A large tip clearance causes a clear structure of well distinguishable unsteady vortices which interact with neighboring blades and hence produce an increase in broadband sound. Moreover, if, compared to the design flow rate, there is a moderate flow rate reduction, the local tip vortex systems of all individual blade tips form a circumferentially coherent flow structure, resulting in distinct humps of sound pressure in the acoustic far field. By means of a rigid ring-type protrusion fixed to the inner casing wall, the generation of the tip clearance vortices and slowly rotating coherent flow structures could be suppressed. As a consequence, the sound emitted by the fan is substantially reduced.

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30

Wright, T., and W. E. Simmons. "Blade Sweep for Low-Speed Axial Fans." Journal of Turbomachinery 112, no. 1 (January 1, 1990): 151–58. http://dx.doi.org/10.1115/1.2927413.

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The available literature on aerodynamic and acoustic properties of axial fans with swept blades is presented and discussed with particular emphasis on noise mechanisms and the influence of high-intensity inlet turbulence on “excess” noise. The acoustic theory of Kerschen and Envia for swept cascades is applied to the problem of axial fan design. These results are compared to available data and a provisional model for specifying sweep angles is presented. The aerodynamic performance theory for swept-bladed rotors of Smith and Yeh is adapted for use in designing low-speed axial fans. Three prototype fans were designed using the resultant computer codes. One is a baseline fan with blade stocking lines radially oriented, and two are fans having swept blades of increasingly greater forward sweep. Aerodynamic testing shows that performance of the fans lies within a band width of about ± 2 percent of volume flow rate and pressure rise predictions in the region of design performance, effectively validating the design procedure for selection of the blading parameters. Noise testing of the fans was carried out and the results show an average noise reduction for the swept-bladed fans of about 7 dBA overall, and a reduction of pure tone noise at blade-pass frequency of about 10 dB compared to the zero-sweep baseline model, in close agreement with the theory of Kerschen and Envia.

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31

Ito, Takahiro, Gaku Minorikawa, and Qinyin Fan. "Experimental Research for Performance and Noise of Small Axial Fan." International Journal of Fluid Machinery and Systems 2, no. 2 (June 1, 2009): 136–46. http://dx.doi.org/10.5293/ijfms.2009.2.2.136.

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32

TANIDA, Kazuhiro, Kazuo MATSUUCHI, Masakazu WATANABE, and Noboru MATSUDA. "Propagation Character and Active Control of Axial-Flow Fan Noise." Proceedings of the JSME annual meeting 2000.1 (2000): 955–56. http://dx.doi.org/10.1299/jsmemecjo.2000.1.0_955.

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33

Liu, Y., Y. S. Choy, L. Huang, and L. Cheng. "Reactive control of subsonic axial fan noise in a duct." Journal of the Acoustical Society of America 136, no. 4 (October 2014): 1619–30. http://dx.doi.org/10.1121/1.4894798.

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34

NISHIOKA, Takahiro, Tadashi KOOZU, and Kouji NAKAGAWA. "Noise from an Axial-flow Fan with an Air Separator." Transactions of the Japan Society of Mechanical Engineers Series B 64, no. 617 (1998): 148–54. http://dx.doi.org/10.1299/kikaib.64.148.

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35

Gee, Kent L., and Scott D. Sommerfeldt. "A compact active control implementation for axial cooling fan noise." Noise Control Engineering Journal 51, no. 6 (2003): 325. http://dx.doi.org/10.3397/1.2839728.

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36

YADA, Motoharu, Kenta TSUTSUI, Kenji KOZONO, and Yutaka KAWATA. "707 Research on Low Noise Axial Fan by Utilizing CFD." Proceedings of Conference of Kansai Branch 2011.86 (2011): _7–7_. http://dx.doi.org/10.1299/jsmekansai.2011.86._7-7_.

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37

ONAKA, Masaaki, Kazuta MIZOBATA, Syogo YOKOBORI, Akiyoshi MORITA, Yutaka KAWATA, and Masahiro MIYABE. "Research on Performance and Noise of Counter Rotating Axial Fan." Proceedings of Conference of Kansai Branch 2018.93 (2018): 606. http://dx.doi.org/10.1299/jsmekansai.2018.93.606.

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38

YADA, Motoharu, and Yutaka KAWATA. "G050053 Research on Low Noise Axial Fan by Sweep Blade." Proceedings of Mechanical Engineering Congress, Japan 2011 (2011): _G050053–1—_G050053–5. http://dx.doi.org/10.1299/jsmemecj.2011._g050053-1.

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39

YOSHIDA, Kenji, Yohei KAMIYA, Masato KOMURA, Hideki OYA, and Etsuro YOSHINO. "Noise reduction effect of leading-edge serrations on axial fan." Proceedings of the Fluids engineering conference 2019 (2019): IS—18. http://dx.doi.org/10.1299/jsmefed.2019.is-18.

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40

Honda, Yoshihisa, Satoshi Saburi, Hiroshi Matsuhisa, and Susumu Sato. "Active Minimization of Blade Rotational Noise from an Axial Fan." Transactions of the Japan Society of Mechanical Engineers Series C 59, no. 562 (1993): 1830–35. http://dx.doi.org/10.1299/kikaic.59.1830.

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41

Liu, Naitong, Changyong Jiang, Lixi Huang, and Chen Wang. "Effect of porous casing on small axial-flow fan noise." Applied Acoustics 175 (April 2021): 107808. http://dx.doi.org/10.1016/j.apacoust.2020.107808.

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42

Wu, C. J., and X. Y. Zhang. "Numerical Prediction on Noise from Axial Flow Fan Based on Modified Blade Force Model." Applied Mechanics and Materials 141 (November 2011): 381–85. http://dx.doi.org/10.4028/www.scientific.net/amm.141.381.

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This paper presents a modification to the existing blade force model of Wu et al. [5] to predict noise radiated from a low-pressure axial flow fan. The aerodynamic theory for the fan impeller is introduced and the module analysis is conducted to calculate the flow parameters more accurately, the lift coefficient is modified by taking into account the specific shape of the blade, and an empirical parameter is also replaced by the CFD simulation based on FLUENT software. The numerical prediction on the noise radiated from the fan is performed by using the modified model, and the predicted results are more closely to the experimental results than those before modification.

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Floss, Sebastian, Felix Czwielong, Manfred Kaltenbacher, and Stefan Becker. "Design of an in-duct micro-perforated panel absorber for axial fan noise attenuation." Acta Acustica 5 (2021): 24. http://dx.doi.org/10.1051/aacus/2021015.

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The reduction of fan noise in ducts is a challenging task for acoustic engineers. Usually, the confined space where an absorber can be integrated is small. In addition, one has to consider the influence of the absorber on the flow field and the attenuation of noise should be as great as possible. In this contribution, we investigate the application of a micro-perforated absorber (MPA) in the direct vicinity of a low-pressure axial fan operating at low Mach number conditions. The micro-perforated plates (MPP) are modeled using the Johnson–Champoux–Allard–Lafarge (JCAL) model for porous materials. The entire geometrical setup of duct, fan and MPA is then simulated with the Finite Element (FE) method; the pre-processing effort is reduced by using non-conforming grids to discretize the different regions. The influence of the cavity length and the positioning of the fan are analyzed. The results are then applied to the construction of a full-sized MPA duct component that takes the limited space into consideration. Simulation results and overall functionality are compared to experimental results obtained in an axial-fan test rig. The Finite Element framework proved to be robust in predicting overall sound pressure level reduction in the higher volume flow rates. It is also shown that the MPP increases sound reduction in the low-frequency regime and at two resonant frequencies of the MPA setup. However, its main benefit lies in maintaining the efficiency of the fan. The location of the fan downstream or within the MPA has a significant effect on both the simulated and measured sound reduction.

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Yu, Peixun, Junqiang Bai, and Xiao Han. "Optimization of Low Noise Blade of Small Axial Fan at Low Reynolds Number." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 236–56. http://dx.doi.org/10.3397/in-2021-1380.

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A multidisciplinary optimization design to simultaneously enhance the aeroacoustic and aerodynamic performance of an cooling fan is performed. The flow analysis of the cooling fan is conducted by solving three dimensional steady-state RANS equations with shear-stress transport turbulence model. Based on the results of the steady flow, aeroacoustic analysis is performed by using the Hanson and Brooks model. A multi-objective optimization is performed to simultaneously improve the efficiency and reduce the sound pressure level through an improved non-dominated sorting gentic algorithm. A Kriging surrogate model is used to approximate the function value while reducing computational cost. Series of optimum designs on the pareto front yielded increases in efficiency and decreases in the sound pressure level compared to the reference design. Through numerical analysis and experimental test, the aerodynamic efficiency is increased by 5% and the total sound pressure level is reduced by 4dB without loss of air volume for the selected optimized cooling fan. The thining of rotor boundary layer and inward load shift are the main factors to improve aerodynamic efficiency and reduce noise of the cooling fan.

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Huang, Haihong, Zheng Wang, and Zhifeng Liu. "Investigation of aerodynamic performance of small axial flow fan coupled with deflecting ring." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 10 (December 14, 2015): 1839–48. http://dx.doi.org/10.1177/0954406215622792.

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Experimental and numerical investigations on the effect of deflecting rings featuring different axial lengths on aerodynamic performance of the small axial flow fan were conducted under the condition of maximum flow rate. Two deflecting rings, the semi-open type and closed type, were investigated. Aerodynamic and aeroacoustic performances have been measured in experiment, and key analysis of flow was based on computational fluid dynamics results. The numerical and experimental results show that the deflecting ring has great influence on the performance of an axial flow fan. For the semi-open-type deflecting ring, the fan has better P-Q performance and higher efficiency; pressure, vorticity, and vorticity gradient distributions on the blade surface are more uniform; and noise level of the fan is lower at wider frequency bands. For the closed-type deflecting ring, the performance curve has a convex feature; blade pressure difference between the pressure surface and the suction surface is much bigger. The result shows that better aerodynamic and aeroacoustic performances of the axial flow fan can be acquired when the semi-open-type deflecting ring is adopted.

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Hill, S. D., R. L. Elder, and A. B. McKenzie. "Application of casing treatment to an industrial axial-flow fan." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 212, no. 4 (June 1, 1998): 225–33. http://dx.doi.org/10.1243/0957650981536754.

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This paper deals with an experimental investigation into the influence of a vaned recess casing treatment on the performance of an industrial-type axial-flow fan with a hub-tip ratio of 0.4. The treatment has been tested in a variety of configurations relative to the fan, with an emphasis on the amount of fan blade tip exposure to the treatment. Two sets of blading, one of which is of the fully reversible type, have been investigated. Detailed flow measurements have been carried out with a slanted hot wire probe to provide an insight into the operation of the device and into the nature of the rotating stall in the solid casing configuration. Strain gauges have been employed to enable blade stresses to be recorded and an in-duct microphone to enable comparative tests on fan noise has also been used.

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Barakat, Abdallah, and BeiBei Sun. "Prediction of Aerodynamic Noise in Axial Fan Using Serration Edge Blades." International Journal of Fluid Machinery and Systems 13, no. 3 (September 30, 2020): 570–82. http://dx.doi.org/10.5293/ijfms.2020.13.3.570.

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Jang, I. Y., C. K. Han, and Y. J. Moon. "COMPUTATIONAL AERO-ACOUSTIC STUDY ON AXIAL FAN NOISE AND ITS CHARACTERISTICS." Journal of Computational Fluids Engineering 22, no. 2 (June 30, 2017): 15–20. http://dx.doi.org/10.6112/kscfe.2017.22.2.015.

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Duke, Cole V., Scott D. Sommerfeldt, and Kent L. Gee. "Active feedback control of broadband noise from a small axial fan." Journal of the Acoustical Society of America 125, no. 4 (April 2009): 2494. http://dx.doi.org/10.1121/1.4783332.

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Fang, F., and Q. G. Chen. "Numerical analysis of noise characteristics of a contra-rotating axial fan." IOP Conference Series: Earth and Environmental Science 15, no. 4 (November 26, 2012): 042028. http://dx.doi.org/10.1088/1755-1315/15/4/042028.

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