Effects of an Inclined Blade on the Performance of a Sirocco Fan

Ni, Shaosong; Cao, Wenbin; Xu, Jun; Wang, Yingdong; Zhang, Wei

doi:10.3390/app9153154

Cited by 9 publications

(7 citation statements)

References 24 publications

(23 reference statements)

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“…The characteristics of internal flow in the Sirocco fans were investigated in a number of numerical and experimental works to explore the effect of specific geometric features of the impeller. Ni et al 1 studied the influence of installation angle of V-shaped blades on the aerodynamics performances of a Sirocco fan. The V-shaped blades were designed and installed in parallel with the shaft of the fan.…”

Section: Introductionmentioning

confidence: 99%

Orthogonal optimization design of a Sirocco fan and numerical analysis on the internal flow characteristics

Liu

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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The forward-curved multi-blade centrifugal fan, also termed as Sirocco fan, is characterized by its complex characteristics of internal flow within the impeller and volute. Currently most of the fans are designed with modifications or optimizations for certain geometric parameters which could not ensure the well compatibility of flow in the impeller and volute, thus it is difficult to improve the aerodynamic performances of the fans. In this paper, we performed a multi-parameter design of a Sirocco fan with optimizations on the geometric parameters of the impeller and volute. The geometric parameters of the volute were designed based on analysis of the internal flow patterns, and the influence from the impeller is also considered. Optimization on the geometric parameters was carried out using the steepest descent method to improve the static pressure rise and efficiency under the designed flow rate by taking into account the relevance of flow in the impeller and volute. The effect of the parametric optimization is evaluated and analyzed by large-eddy simulation (LES). It was found that the static pressure rise and efficiency of the optimized model increase by 1.8% and 5.0% compared with the baseline model, respectively. The static pressure rise fluctuates in a regularly periodic manner. The optimized model reduces the area of low-pressure recirculating flow at the center of the fan and the separated flow on the suction surface of the blades. The near-wall flow on the volute surface is more stable, and the pressure fluctuation around the volute tongue is reduced. The outflow of the volute exhibits better uniformity than the baseline model.

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Section: Introductionmentioning

confidence: 99%

Orthogonal optimization design of a Sirocco fan and numerical analysis on the internal flow characteristics

Liu

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Numerous studies have employed steady simulations using two-equation Reynolds-Averaged Navier-Stokes (RANS) turbulence models to investigate centrifugal fan flows or to improve or optimize fan design and performance [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. These publications cover centrifugal fans of different sizes, ranging from flat miniature fans [20,23] to large industrial fans with impeller diameters exceeding one meter [24,28].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Numerical Flow Simulations of a Centrifugal Electronic Cooling Fan Using Four Different Turbulence Models

Kirchhofer,

Krieger,

Hofer

2023

Energies

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In this study the flow field of a centrifugal electronic cooling fan operating at an off-design point of 0 Pa static fan pressure is investigated by means of Computational Fluid Dynamics. The results obtained by four different turbulence models, the realizable k-ϵ model, the SST k-ω model, a Reynolds Stress Model, and Scale-Adaptive Simulation are analyzed and compared. The focus lies on describing how the flow through impeller and volute influences the fan outlet flow field, and velocity profiles and velocity fluctuations at the outlet are compared to previously published measurements. All models tend to underpredict the measured outlet flow rate, but are capable of producing the characteristic C-shaped profile of high velocities, previously determined in Constant Temperature Anemometry measurements. However, the realizable k-ϵ model is significantly too diffusive, leading to blurred velocity contours. The other models exhibit reasonable agreement with the measured flow field, but show differences in a number of aspects. The SST k-ω model, for instance, even produces local inflow in a confined area. The SAS approach overpredicts the length of the lower lobe of the C-shape. The research is relevant to improve simulation results of impingement cooling and heat sink optimization using centrifugal fans.

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“…The counter-flow in the impeller passage is reduced, and the high pressure area moves to the outlet of the volute. Ni et al 16 discussed the influence of an inclined blade on fan performance, and the results showed that there is an optimal angle, which produces the optimal aerodynamic performance. Engin et al 17 used a ceramic impeller to study the performance characteristics of the impeller and the influence of tip clearance changes on the performance of the fan at high temperature, and found that gas temperature had almost no influence on performance degradation due to tip leakage.…”

Section: Introductionmentioning

confidence: 99%

Effect of motor intrusion on the aerodynamic performances and unsteady characteristics of internal flow of a volute-free centrifugal fan

Qin

Wang

He³

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The volute-free centrifugal fans are widely used in air conditioning and ventilation applications due to their simple configuration and easy maintenance. The motor normally intrudes towards the fan interior from the rear disc to reduce the size and achieve better compatibility. The size and geometry of the motor affects the local flow field, which may have a serious impact on the aerodynamic performances of the fan. In this paper, we numerically investigated the effect of motor intrusion on the performances and internal flow characteristics of the volute-free centrifugal fan at different flow rates. The numerical results reveal that the internal flow field varies with the increasing of motor height at all flow rates. Under large flow rate, the height of motor has more obvious influence on the static pressure and static pressure efficiency of the fan; as the height of motor increases from 0 to 4 H/8, the two values decrease by 82.8% and 49.7%, respectively. The flow is more unstable which are manifested by the intensified velocity and pressure fluctuations. Therefore, the blocking effect of motor cannot be ignored and must be taken into account for the design the volute-free centrifugal fans.

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Effects of an Inclined Blade on the Performance of a Sirocco Fan

Cited by 9 publications

References 24 publications

Orthogonal optimization design of a Sirocco fan and numerical analysis on the internal flow characteristics

Orthogonal optimization design of a Sirocco fan and numerical analysis on the internal flow characteristics

A Comparative Study on Numerical Flow Simulations of a Centrifugal Electronic Cooling Fan Using Four Different Turbulence Models

Effect of motor intrusion on the aerodynamic performances and unsteady characteristics of internal flow of a volute-free centrifugal fan

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