A study of radiator cooling fan with labyrinth seal

Shimada, Kota; Kimura, Kazuhide; Watanabe, Hiroshi

doi:10.1016/s0389-4304(03)00076-6

Cited by 9 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Morris and Foss [5] designed an aerodynamic shroud for an engine fan; the use of an annular air jet to control the aerodynamics of the tip clearance in the tip clearance region proved to be an effective method of changing the performance and efficiency characteristic of the fan. Shimada et al [6] carried out experiments to study the effect of rings fixed on the blade tips of the same fan on the performance of the fan. They concluded that the fan with a fixed ring and a labyrinth seal prevented the effect of the tip clearance and achieved a higher fan performance and lower fan noise than the conventional fan for any practical tip clearances.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the effect of the shroud on the performance and flow field of an automotive cooling fan

Wen

Gao

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

The effect of the shroud position on the performance of an automotive cooling fan with the radiator mounted at the front end has been studied on a test platform, and the characteristics of the flow field and phase-averaged velocity, vorticity, and turbulence intensity in five phases behind the cooling fan have been acquired by using digital particle image velocimetry. Moreover, a comparison of the flow field behind the fan with the shroud and that behind the fan without the shroud is made. The results of the performance experiment demonstrate that the fan with the shroud covering only the front part of the rotor possesses the highest performance, and the performance of the fan without the shroud seems to be less affected by the system flowrate. Flow field measurements show that the fan with the shroud has a larger exit radial component of the velocity than the fan without the shroud except at low system flowrates, and the vorticity and the turbulence intensity of the fan with the shroud are lower than those of the fan without the shroud.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental study on the effect of the shroud on the performance and flow field of an automotive cooling fan

Wen

Gao

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…The labyrinth mechanism of such fans whose ring is covered with a fan shroud reduces the leakage flow, and thus improves the fan's performance (Shimada et al, 2002). In this case, a labyrinth seal operates in an extremely low static pressure difference with a large clearance because of the low operating pressure of the radiator cooling fans and their imprecise structure made of plastic.…”

Section: Introductionmentioning

confidence: 99%

Phenomenon of labyrinth seal with low static pressure difference and large clearance

Shimada

Kimura

Ichikawa

et al. 2004

J Vis

View full text Add to dashboard Cite

This paper discusses the straight-through type labyrinth seal. This labyrinth seal is used for axial flow fans, which have an outer ring at the blade tip to seal the clearance between the ring tip and the fan shroud, in order to prevent the reverse flow or leakage. These fans are used for the cooling of automobile radiators. In these cases, the labyrinth seal is used in an extremely low static pressure difference and a large clearance. A significant decrease of the leakage rate was reported even when the labyrinth seal rotated in comparatively low speed in this unique condition according to the authors' former report. However, this phenomenon is different from past research. Furthermore the cause of this phenomenon has not been determined. Therefore, the internal flow was depicted with Computational Fluid Dynamics (CFD) in order to clarify the cause of this phenomenon. The results of CFD show that the leakage rate decreases significantly because the carry-over flow is intercepted in the expansion groove. This is the newly discovered phenomenon which occurs under the unique condition of an extremely low differential pressure. It has not been pointed out before as the reason why the rotation decreases the leakage rate.

show abstract

“…The first type is the axial flow fan which has nothing attached to its blade tip. Also in this case, the reverse flow or the leakage flow influences the fan performance, like the case of the fan without a ring (Shimada et al, 2002). In the case of an axial flow fan without the ring, it is known that the reverse flow and the leakage, which occur at the tip clearance between the blade tip and the fan shroud, affect fan performance.…”

Section: Introductionmentioning

confidence: 99%

Phenomenon of labyrinth weal with Low static pressure difference and large clearance

Shimada

Kimura

Ohta

et al. 2003

J Vis

View full text Add to dashboard Cite

Abs ractG : The low pressure axial flow fans with an outer ring, used for cooling automobile radiators, have a significantly large tip clearance between the ring tip and the fan shroud. It has been found that the turbulent reverse flow, or leakage flow, which occurs at the tip clearance, greatly affects the fan performance and noise level. Therefore, in order to improve the fan performance and noise level it is important to decrease the effect of leakage at the tip clearance. The authors investigated the performance of the straight-through type of labyrinth seal which operates in an extremely low static pressure difference with a large clearance. It was hoped that by sealing this clearance with the labyrinth seal the performance would be improved. It was verified that the labyrinth seal satisfied almost the same performance as that predicted by the previous theory. This theory was established by experimental studies in the condition of quite high static pressure difference when the labyrinth is stationary. However, it was later discovered that the leakage rate decreased significantly even though there was far lower ring speed in comparison to past research results where the ring rotated. This phenomenon is conspicuous in a lower differential pressure. However, the cause of this phenomenon has not been determined. t t

show abstract

A study of radiator cooling fan with labyrinth seal

Cited by 9 publications

References 2 publications

Experimental study on the effect of the shroud on the performance and flow field of an automotive cooling fan

Experimental study on the effect of the shroud on the performance and flow field of an automotive cooling fan

Phenomenon of labyrinth seal with low static pressure difference and large clearance

Phenomenon of labyrinth weal with Low static pressure difference and large clearance

Contact Info

Product

Resources

About