Analysis of vortical flow field related to aero-acoustic sound in an air conditioning system by wall pressure measurement and CFD (2nd Report, blade passing frequency in a blower)

Jeong, Jae-Ho

doi:10.1007/s12206-017-0433-5

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…The results indicate that pressure fluctuation near the volute tongue weakens as the impeller-volute tongue clearance increases. Jeong 12,13 experimentally and numerically investigated the flow near the volute tongue. Their results confirmed that reversed flow occurs near the volute tongue over a wide operating range.…”

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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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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“…17 investigated the effect of volute profile on performance and flow losses of a squirrel cage fan. Jeong 18,19 investigated the flow field within the volute of a squirrel cage fan. Studies concerning the design optimization of the squirrel cage fan based on CFD simulations can be found in Heo et al., 20 Kim et al., 21 Huang and Hung, 22 and Khalkhali et al.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on flow mechanisms of a squirrel cage fan

Wang

Zhang

2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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Squirrel cage fan has found wide applications in heating, ventilation and air-conditioning as well as other cooling systems. Although many studies have been conducted to investigate the performance of the squirrel cage fan, the complex flows and the associated flow mechanisms have not been fully elucidated. In this paper, computational fluid dynamics simulations are performed for a comprehensive analysis of the flow throughout a whole squirrel cage fan. A novel representation technique is proposed for a vivid and 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 pressure gradient distributions, together with the pressure itself, along the volute wall are also extracted and analyzed to explore the local flow conditions of the volute profile with four segmental arcs. The results show that the proposed representation technique is capable of effectively measuring the circumferentially nonuniform flow conditions at both the impeller inlet and outlet. The strong interaction between the impeller and the volute tongue induces reversed flows at both the impeller inlet and outlet, which further aggravates the circumferential nonuniformity of inactive zone and the upstream impeller flow field. Despite the first-order continuity of the volute profile itself, there are strong variations of tangential pressure gradients and sudden diffusion-expansion effects at the junctions of adjacent arcs. These findings benefit a deep understanding of the complex flow mechanisms within the squirrel cage fan.

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Synchronous vortex shedding from aerodynamically isolated side-by-side cylinders imposed by flow-excited resonant acoustic modes

Shaaban

Mohany

2021

Exp Fluids

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Analysis of vortical flow field related to aero-acoustic sound in an air conditioning system by wall pressure measurement and CFD (2nd Report, blade passing frequency in a blower)

Cited by 7 publications

References 11 publications

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

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

Numerical investigation on flow mechanisms of a squirrel cage fan

Synchronous vortex shedding from aerodynamically isolated side-by-side cylinders imposed by flow-excited resonant acoustic modes

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