Experimental and numerical study on the inlet nozzle of a small squirrel-cage fan

Xiao, Wen; Qi, Datong; Mao, Yijun; Yang, Xin

doi:10.1177/0957650913487530

Cited by 18 publications

(7 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They suggested that the design method of the downsized volute profile is more suitable for slight space limitation, while the design method of the partial flow volute profile is more suitable for significant space limitation. Wen indicates that an optimal elliptical inlet nozzle can reduce flow loss before fluid entering into the impeller passages and induce a tip flow pattern, contributing to promote the volume flow rate and suppress the leaking flow loss (Wen et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…In such, the blade inlet angle of many squirrel cage fans is about 80 degrees and the blade inlet angle is about 10 degrees. The total pressure efficiency of most squirrel cage fans can only reach to 45% (Rafael, 2009;Kim and Seo, 2004;Suarez et al 2006;Wen et al 2016;Wen et al 2013). A larger inlet angle not only causes a large airflow impact at the blade inlet, but also makes the airflow difficult to enter the blade passages.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design for a Squirrel Cage Fan with Double Arc Blade

Li¹,

Dou²,

Lin³

et al. 2020

JAFM

View full text Add to dashboard Cite

Squirrel cage fans are commonly used in HVAC (heating, ventilation, and air conditioning) systems. The single arc blade model is commonly used in this type of fans since it can be shaped simply only by two parameters of inlet and outlet angle of blade. However, the efficiency of the fans is much lower than that we expected. In this paper, the single arc blade is replaced by double-arc blade in order to optimize the blade model and to improve the static pressure efficiency and total pressure efficiency of the fan. Numerical results show that the design with double arc blade is able to improve the internal flow, and to enhance the aerodynamic performance of squirrel cage fans.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design for a Squirrel Cage Fan with Double Arc Blade

Li¹,

Dou²,

Lin³

et al. 2020

JAFM

View full text Add to dashboard Cite

show abstract

“…Wen et al. 12 investigated the impact of an elliptical inlet nozzle on the performance of a small squirrel cage fan. Kim 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:

View full text Add to dashboard Cite

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.

show abstract

“…Kim 6 compared several profile schemes and found that fine-tuning the volute profile may not only reduce noise but also improve the performance. Wen et al 7 found that an improper profile can cause a reduction in the total pressure and efficiency. The state of correlation research is yet fragmented and unsystematic, and there is no consensus regarding how the volute profile affects the fans' performance.…”

Section: Introductionmentioning

confidence: 99%

Volute characteristics of centrifugal fan based on dynamic moment correction method

Zhou

2018

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

The multi-blade centrifugal fan features an abundance of vanes (>48) and a spiral volute. The flowability and noise characteristics of the centrifugal fan are dependent on the type-line of volute and tongue geometries at the volute exit. The aim of this research was to find a better volute type-line for fan noise reduction without compromising on the performance. First, the viscosity factors of gas were used to modify the type-line shape of the volute by introducing a dynamic moment correction coefficient; a modified volute was then obtained to match the new fan system. Next, the performance of the original fan and retrofit fan were tested. The optimization scheme was verified and the feasibility of the proposed numerical calculation technique was confirmed.

show abstract

Experimental and numerical study on the inlet nozzle of a small squirrel-cage fan

Cited by 18 publications

References 14 publications

Design for a Squirrel Cage Fan with Double Arc Blade

Design for a Squirrel Cage Fan with Double Arc Blade

Numerical investigation on flow mechanisms of a squirrel cage fan

Volute characteristics of centrifugal fan based on dynamic moment correction method

Contact Info

Product

Resources

About