Numerical and experimental investigations of the unsteady aerodynamics and aero-acoustics characteristics of a backward curved blade centrifugal fan

Zhang, Jianhua; Chu, Wuli; Zhang, Haoguang; Wu, Yanhui; Dong, Xingjie

doi:10.1016/j.apacoust.2016.03.012

Cited by 42 publications

(22 citation statements)

References 15 publications

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“…Details of the grid features and meridian grid cross-section, including the radical gap and cavity around the volute, are shown in Figure 2. More details about the grids of this fan have been reported in the previous work (Jianhua Zhang et al) [13]. The numerical deviations result from the grid number needed to be removed, and a grid-independent validation of the fan total pressure coefficient and efficiency was performed.…”

Section: Methodsmentioning

confidence: 99%

“…The outermost layer exposed to the AML surface that satisfied the Sommerfeld radiation condition was defined as a non-reflecting boundary. Based on the FEM method, Zhang [13] performed the aerodynamic noise of the centrifugal fan using the FEM method, and achieved higher prediction accuracy while using less computing resources. To reveal and reduce the noise primarily generated by the freezer fan unit, Onur [14] investigated the vibration and acoustic interactions between the structure and the cavity inside the freezer cabinet, and the FEM method was also used.…”

Section: Introductionmentioning

confidence: 99%

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Vibroacoustic Optimization Study for the Volute Casing of a Centrifugal Fan

et al. 2019

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A numerical optimization is presented to reduce the vibrational noise of a centrifugal fan volute. Minimal vibrational radiated sound power was considered as the aim of the optimization. Three separate parts of volute panel thickness (ST: the side panel thickness; BT: the back panel thickness; FT: the front panel thickness) were taken as the design variables. Then, a vibrational noise optimization control method for the volute casing was proposed that considered the influence of vibroacoustic coupling. The optimization method was mainly divided into three main parts. The first was based on the simulation of unsteady flow to the fan to obtain the vibrational noise source. The second used the design of experiments (DoE) method and a weighted-average surrogate model (radial basis function, or RBF) with three design variables related to the geometries of the three-part volute panel thickness, which was used to provide the basic mathematical model for the optimization of the next part. The third part, implementing the low vibrational noise optimization for the fan volute, applied single-objective (taking volute radiated acoustical power as the objective function) and multi-objective (taking the volute radiated acoustical power and volute total mass as the objective function) methods. In addition, the fan aerodynamic performance, volute casing surface fluctuations, and vibration response were validated by experiments, showing good agreement. The optimization results showed that the vibrational noise optimization method proposed in this study can effectively reduce the vibration noise of the fan, obtaining a maximum value of noise reduction of 7.3 dB. The optimization in this study provides an important technical reference for the design of low vibroacoustic volute centrifugal compressors and fans whose fluids should be strictly kept in the system without any leakage.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibroacoustic Optimization Study for the Volute Casing of a Centrifugal Fan

et al. 2019

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“…11. It was similar to the acoustical finite element mesh used for aerodynamic noise calculations [23]. Taking into account the characteristic of radiated vibrational noise, the volute's inlet and outlet were completely enclosed.…”

Section: Vibro-acoustic Mathematical Modelmentioning

confidence: 99%

Vibro-Acoustic Optimization Study for the Volute Casing of a Centrifugal Fan

Zhang¹,

Chu²,

Zhang³

et al. 2018

Preprint

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Concerning fan systems with an air pipe connecting air intake and a closed outlet, aerodynamic noise cannot be directly transmitted from the fan inlet and outlet to the outside. At this moment, the volute vibrational radiation noise induced casing surface vibration is the major noise component. The main factors affecting the fan vibrational noise are analyzed through theoretical derivation, then a vibrational noise optimization control method for the volute casing is proposed that considered the influence of vibro-acoustic coupling, taking the panel thickness of the volute (front-panel thickness [FT], side-panel thickness [ST], and back-panel thickness [BT]) as design variables, and the acoustical power of the volute surface and the total mass of the volute as the optimal target function. The optimization method is mainly divided into three main parts: the first was based on the simulation of unsteady flow of the fan to obtain the vibrational noise source; the second, using the design of experimental (DOE) method and the proposed numerical simulation of fluid-structure-acoustic coupling method to obtain the designing space, then the radical-based function (RBF) method is used to construct the approximate surrogate model instead of the simulation model previously mentioned, which was used to provide the basic mathematical model for the optimization of the next part; the third part, implementing the low vibrational noise optimization for the fan volute, applied the single-target (taking volute radiated acoustical power as the target function) and the multi-target (taking the volute radiated acoustical power and volute total mass as the target function) methods. In addition, the fan aerodynamic performance, volute casing surface fluctuations, and vibration response were validated by experiments, showing good agreement. It is of utmost importance that the dynamic pressure measurements and vibrational tests on the volute casing verify the accuracy of the numerical calculation. The optimization results showed that the vibrational noise optimization method proposed in this study can effectively reduce the vibration noise of the fan, obtaining a maximum value of noise reduction of 7.3 dB. The optimization identified in this paper provides a significant reference for the design of a low-vibrational-noise volute.

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“…The unsteady fan flow field, its characteristics and influences on noise prediction and noise generation was investigated by Trabelsi et al [21] for an axial fan. The same fan flow field and its influences on noise were investigated by Wolfram and Carolus [22] and Zhang et al [23] for a radial (centrifugal) fan.…”

Section: Introductionmentioning

confidence: 96%

Energy and Exergy Analyses of Forced Draft Fan for Marine Steam Propulsion System during Load Change

Mrzljak

Blecich

Anđelić

et al. 2019

JMSE

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A forced draft fan, used for the supply of combustion air into the steam generator of the conventional liquefied natural gas (LNG) carrier was analyzed from the aspect of energy and exergy. The power delivered from the induction motor to the fan was calculated using the manufacturer’s data. The most significant impact on the fan energy power losses is from the air temperature difference between the fan outlet and inlet. The fan energy power losses are inversely proportional to the fan energy efficiency, and the values are between 19.9% and 63.4%, for the entire range of observed steam system loads. The fan exergy destruction depends primarily on the driving power and on the air mass flow rate. At higher loads, an important influence on the fan exergy destruction is from the air pressure at the fan outlet. The exergy efficiency change of the analyzed fan, for the range of observed steam system loads, is directly proportional to the rate of change in the air mass flow, whereas the obtained values of exergy efficiency are between 5.10% and 53.93%. The impact of ambient temperature on the fan exergy destruction and exergy efficiency exhibits is different than in most other steam system components. A change in ambient temperature of 10 °C causes a change in the exergy efficiency of the forced draft fan less than 0.5% in the entire range of observed steam loads.

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Numerical and experimental investigations of the unsteady aerodynamics and aero-acoustics characteristics of a backward curved blade centrifugal fan

Cited by 42 publications

References 15 publications

Vibroacoustic Optimization Study for the Volute Casing of a Centrifugal Fan

Vibroacoustic Optimization Study for the Volute Casing of a Centrifugal Fan

Vibro-Acoustic Optimization Study for the Volute Casing of a Centrifugal Fan

Energy and Exergy Analyses of Forced Draft Fan for Marine Steam Propulsion System during Load Change

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