Problems Associated With Windscreen Wiping

Clarke, J. S.; Lumley, R. R.

doi:10.4271/600134

Cited by 5 publications

(2 citation statements)

References 1 publication

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“…In the last decades, some researchers investigated aerodynamic lift acting on windshield wiper blades to improve the wiping performance of a vehicle moving at a high speed. Clarke et al (1960) studied the aerodynamic forces acting on windshield wiper system. They stated wiping quality decreases with increasing vehicle velocity.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Wiper System Performance at High Speeds

Çadırcı¹,

Ak²,

Selenbas³

et al. 2017

JAFM

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In this study, aerodynamic forces acting on the windshield wiper system at critical wiper angles are simulated using different wiper blade geometries, i.e., wiper and spoiler modifications, to solve the wiping problem occurring at high speeds due to lifting forces. Undesired aerodynamic lift forces reach a peak at critical blade angles, thus turbulent air flow around the wiper blades at critical angles on a car model is investigated numerically in detail to solve this problem. Previous experimental studies have shown that the front windshield wiper blades can be lifted up by aerodynamic forces between wiper blade angles of 30-40°, if no geometric modifications are done to prevent this. The possible modifications which can have a positive effect on wiper's performance include wiper's profile (also spoiler's curvature), wiper's height and connection type of the rubber part to the metal part. Aerodynamic lift and drag forces acting on the wiper blade and wiper arm are calculated for both driver's and passenger's sides. It is revealed that for both wiper blades on the driver's and passenger's sides, an increased wiper height with a blunt connection type can supply most satisfactory results in terms of decreased lift forces, in other words negative lift forces. Utilizing the output of the numerical analysis, the new wiper-blade-spoiler profile is selected and then manufactured to test its wiping performance in a thermal wind tunnel by soiling tests. Numerical studies are validated by experimental tests, since the new wiper profile has been proven as a more efficient prototype in terms of wiping performance compared to the original one.

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Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Wiper System Performance at High Speeds

Çadırcı¹,

Ak²,

Selenbas³

et al. 2017

JAFM

View full text Add to dashboard Cite

show abstract

“…Current wiper blades can work up to vehicle speeds around 160 km/h without apparent problems, however at relatively higher speeds such as 240 km/h, lift forces become much more apparent. Clarke et al [1] studied aerodynamic forces acting on windshield wiper system. They carried out water tunnel tests with a 1/20 ratio model, aerodynamic tests in a rectangular duct and wiping tests for flat plate and a realistic car model.…”

Section: Introductionmentioning

confidence: 99%

Improving aerodynamic performance for a reliable wiper system

Çadırcı¹,

Ak²,

Selenbas³

et al. 2017

International Journal of Automotive Engineering and Technologies

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In this study, it is aimed to simulate aerodynamic forces acting on the windshield wiper system on a simplified geometry at different blade angles. Numerical simulations reveal that at critical blade angles, undesired lift forces can reach their peak values. The blade-spoiler geometry is modified in a manner to alter aerodynamic lift and drag coefficients. On a simplified front windshield it is shown that at a blade angle of 40  , lift forces can be converted to pressing forces by implementing suggested modifications. Furthermore 2 vortex identification is used to understand the formation of vortex structures at different blade angles. On the other hand, soiling tests are performed both on original and modified wiper geometries and their performances are compared.

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Studies of lubricated rubber friction

Roberts

1977

Tribology International

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Problems Associated With Windscreen Wiping

Cited by 5 publications

References 1 publication

Numerical and Experimental Investigation of Wiper System Performance at High Speeds

Numerical and Experimental Investigation of Wiper System Performance at High Speeds

Improving aerodynamic performance for a reliable wiper system

Studies of lubricated rubber friction

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