Numerical investigation on flow mechanisms of a squirrel cage fan

Wang, Ke; Ju, Yaping; Zhang, Chuhua

doi:10.1177/0957650918773932

Cited by 20 publications

(7 citation statements)

References 24 publications

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“…3,30,31 Pressure inlet and Pressure outlet boundary conditions were adopted on the inlet and outlet, 10 respectively. The rotor-stator interfaces were modeled with the moving reference frame (MRF) method, 3,10 which achieves a frame change across the interface without a relative position change. 29 Dry air with a temperature of 25 � C was selected as the fluid medium.…”

Section: Cfdmentioning

confidence: 99%

Multi-objective optimization of squirrel cage fan for range hood based on Kriging model

Xiao

Wang

Jiang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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In view of the multi-objective optimization design of the squirrel cage fan for the range hood, a blade parameterization method based on the quadratic non-uniform B-spline (NUBS) determined by four control points was proposed to control the outlet angle, chord length and maximum camber of the blade. Morris-Mitchell criteria were used to obtain the optimal Latin hypercube sample based on the evolutionary operation, and different subsets of sample numbers were created to study the influence of sample numbers on the multi-objective optimization results. The Kriging model, which can accurately reflect the response relationship between design variables and optimization objectives, was established. The second-generation Non-dominated Sorting Genetic algorithm (NSGA-II) was used to optimize the volume flow rate at the best efficiency point (BEP) and the maximum volume flow rate point (MVP). The results show that the design parameters corresponding to the optimization results under different sample numbers are not the same, and the fluctuation range of the optimal design parameters is related to the influence of the design parameters on the optimization objectives. Compared with the prototype, the optimized impeller increases the radial velocity of the impeller outlet, reduces the flow loss in the volute, and increases the diffusion capacity, which improves the volume flow rate, and efficiency of the range hood system under multiple working conditions.

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Section: Cfdmentioning

confidence: 99%

Multi-objective optimization of squirrel cage fan for range hood based on Kriging model

Xiao

Wang

Jiang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Wu et al 12 found that the vortices in the blade passages and exiting flow at the blade outlet are significantly determined by the angle of attack of the blade, and the performances of the fan can be improved by choosing appropriate values of the angle of attack. Wang et al 13 proposed a novel representation technique for a quantitative description of the flow velocity distributions at the impeller inlet and outlet to aid a heuristic analysis of the complex flows in squirrel cage fan. The representation technique is capable of effectively measuring the circumferentially non-uniform flow conditions at both the impeller inlet and outlet.…”

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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“…Aerodynamic noise is the main noise of centrifugal fans, which mainly composed of discrete and vortex noises. 1 Due to strong unsteady interactions between nonuniform air flow at the rotating impeller outlet and the volute, the volute surface, especially the volute tongue area, becomes the main noise source of a centrifugal fan. This unsteady force is one of the main reasons for discrete noise from fans.…”

Section: Introductionmentioning

confidence: 99%

Optimal design of multi-blade centrifugal fan based on partial coherence analysis

Zhou

Dong

Zhang³

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Considering that there are many design variables in multi-blade centrifugal fans, the complicated design parameters and internal flow uncertainty increase the difficulty of studying fan noise mechanisms. This study adopted the impact noise between the airflow at the impeller outlet inside the fan and the volute tongue as the research object. Based on the influence of mutual interfering noise sources on the system noise, a partial coherence function was introduced to establish a system noise model. The correlation between the static pressure of the impeller outlet in the volute tongue area of the centrifugal fan and far-field noise of the fan was analyzed and obtained. The peak values of fundamental frequency and average sound pressure level of a far-field noise receiving points were selected as the optimization goals, taking the volute tongue placement angle θ1, volute tongue radius R, and center distance L1 as the optimization objects. The Latin hypercube sampling was used to select 35 groups of sampling points and a Kriging agent model was established. The NSGA-II genetic algorithm was used to optimize the volute tongue profile. The results showed that the flow rate was increased by 1.2 m3/min, the far field noise of the centrifugal fan was reduced by 1.9 dB, while the fan efficiency increased by 3%, static pressure increased by 27 Pa, and peak values of fundamental frequency reduced by 8%.

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Numerical investigation on flow mechanisms of a squirrel cage fan

Cited by 20 publications

References 24 publications

Multi-objective optimization of squirrel cage fan for range hood based on Kriging model

Multi-objective optimization of squirrel cage fan for range hood based on Kriging model

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

Optimal design of multi-blade centrifugal fan based on partial coherence analysis

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