Numerical and experimental investigations on non-axisymmetric D-type inlet nozzle for a squirrel-cage fan

Jiang, Boyan; Jun, Wang; Yang, Xiaopei; Xiao, Qianhao

doi:10.1080/19942060.2021.1883115

Cited by 12 publications

(9 citation statements)

References 27 publications

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“…Fluent was used to solve the three-dimensional flow field of range hoods. The Mach number of squirrel-cage fan system is less than 0.3, which is regarded as incompressible [2]. The range hood contains a squirrel-cage fan system and no other rotating parts, which the airflow in the range hood can still be treated as incompressible.…”

Section: Methodsmentioning

confidence: 99%

“…The typical characteristics of a squirrel-cage fan are a large blade exit angle (strong forward blade), many blades (up to 60 pieces), and a short blade path. There are severe flow separation [1] and cross impeller flow in the fan [2]. As well as the complicated geometry of the range hood and the harsh air intake conditions of the fan, the highest efficiency of the range hood is less than 50%.…”

Section: Introductionmentioning

confidence: 99%

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Squirrel-Cage Fan System Optimization and Flow Field Prediction Using Parallel Filling Criterion and Surrogate Model

Xiao

Shi²,

Wu³

et al. 2021

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In this study, the blade shape of the squirrel-cage fan system inside the range hood was optimized using the surrogate model to improve the maximum volume flow rate. The influence of computational fluid dynamics (CFD) noise was concerned. The regression Kriging model (RKM) was used as a surrogate model to reflect the relationship between the design parameters of the blade and the volume flow rate. The parallel filling criterion after re-interpolation was used to improve the optimization efficiency further and ensure global optimization. Through experimental verification, we found that the relative error between the volume flow rate of the optimal sample of RKM and the experiment was only 0.4%. Compared with the prototype, the maximum volume flow rate of the optimal sample of RKM was increased by 2.9%, and the efficiency under the corresponding working conditions was increased by 2%. RKM was used to predict the velocity field of the volute and impeller exit section to explore the feasibility of the RKM in the flow field prediction. Research shows that the RKM cannot accurately predict the velocity of each grid on the cross-section. Still, it can accurately predict the changing trend of the velocity.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Squirrel-Cage Fan System Optimization and Flow Field Prediction Using Parallel Filling Criterion and Surrogate Model

Xiao

Shi²,

Wu³

et al. 2021

Processes

Self Cite

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“…Zhaoyang et al 29 fitted a vortex-breaking device inside the volute to lessen the large-scale vortex and enhance the fan's internal airflow. Wang et al 30,31 enhanced the blade structure to improve flow separation in the blade channel. They also modified the inlet collector's shape and installation position to minimize the vortex at the entrance by lowering the generation of separation vortices.…”

Section: Introductionmentioning

confidence: 99%

Cause analysis and suppression method of the vortex at the impeller outlet of the multiblade centrifugal fan

Lei

Jia

Cui

et al. 2023

Energy Science & Engineering

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Indoor air conditioning systems play a crucial role in regulating the environmental conditions of enclosed spaces. The noise generated by such systems can significantly impact human comfort. The multiblade centrifugal fan, as a crucial component of indoor air conditioners, has a significant impact on the performance of the air conditioner. The vortex, which is the primary noise source inside the fan, hinders the aerodynamic noise reduction of the indoor unit. During experimental research and numerical simulation of the indoor unit, the researchers identified the presence of a vortex flow at the outlet of the multiblade centrifugal fan. By analyzing the velocity vector of different cross‐sections in the fan, the researchers determined the formation mechanism and influencing factors of the vortex at the fan's outlet. The addition of fairing sheet plates on the volute wall was explored as a vortex suppression method, which proved effective in weakening and suppressing the vortex. The test results showed that under the same air volume, the noise reduction amplitude of the fan equipped with fairing sheet blades was 1.2 dB at an outlet static pressure of 30 Pa and 0.7 dB at an outlet static pressure of 100 Pa. The research findings suggest that the addition of the fairing sheet can effectively reduce the vortex's intensity, improve the performance of the multiblade centrifugal fan, and reduce the noise.

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“…The flow in the stationary components has a large pressure gradient or a non-uniform pattern, and then causes considerable energy los. 4,5 Thus the modification and optimization of the stationary components have great significance to improve the overall aerodynamic performance of the squirrel cage fan.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that the larger inlet nozzle size than the impeller inlet diameter leads to a distorted flow pattern in the impeller and a lower efficiency of the fan. Liu et al 4 proposed a non-axisymmetric D-type inlet nozzle to manage the reverse flow inside the fan. The recommended installation direction of the D-type nozzle was presented, which can effectively inhibit the intensity of cross-impeller flow and the vortex in the chamber under low flow rate.…”

Section: Introductionmentioning

confidence: 99%

Integrated aerodynamic optimization for stationary components of squirrel cage fan Considering impeller-Volute interaction

Wang

Shi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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As the flow state in the volute plays an important role in the energy loss of the squirrel cage fan, the optimization design of the fan volute has drawn great attention. To further improve the overall performance of the fan, the aerodynamic match between the volute and the inlet nozzle as well as the local flow pattern within the fan components should be considered in the optimization. In the present work, a high-dimensional optimization method based on the genetic algorithm, support vector regression surrogate model, Latin hypercube sampling method and the mixed adaptive sampling algorithm is developed. Then, the integrated optimization for inlet nozzle and volute of the fan is carried out, in which both the aerodynamic performance and the impeller-volute interaction are considered. The optimization results show that the total efficiency of the fan increases by 2.24% and the static pressure recover coefficient increases by 2.18%. The reversed flow at the impeller outlet is restrained, and the flow uniformity at the impeller inlet is improved. This work is helpful for the design of squirrel cage fans with high aerodynamic performance.

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Numerical and experimental investigations on non-axisymmetric D-type inlet nozzle for a squirrel-cage fan

Cited by 12 publications

References 27 publications

Squirrel-Cage Fan System Optimization and Flow Field Prediction Using Parallel Filling Criterion and Surrogate Model

Squirrel-Cage Fan System Optimization and Flow Field Prediction Using Parallel Filling Criterion and Surrogate Model

Cause analysis and suppression method of the vortex at the impeller outlet of the multiblade centrifugal fan

Integrated aerodynamic optimization for stationary components of squirrel cage fan Considering impeller-Volute interaction

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