Design and methodology for evaluating aerodynamic characteristics of sports textiles

Chowdhury, Harun; Alam, Firoz; Mainwaring, David E.; Subic, Aleksandar; Tate, Margaret; Forster, Dorothy; Beneyto‐Ferre, Jordi

doi:10.1080/19346182.2009.9648505

Cited by 18 publications

(7 citation statements)

References 5 publications

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“…The C L behavior at low Re is believed to be experimental error. The C D value at stream-wise ( = 0°) and span-wise ( = 90°) was agreed with published data (Hoerner [8], Chowdhury et al [16], Achenbach [17] and White [18]). However, the maximum C L value was found at = 45° and values decrease with the further increase or decrease of angles of attack.…”

Section: Resultssupporting

confidence: 90%

“…Kyle et al [11,12], Oggiano et al [13], Strangwood [14] and Moria et al [15] have mainly focused on the aerodynamic behavior of fabrics using vertical cylindrical methodology in wind tunnel environments. Chowdhury et al [16] evaluated aerodynamic properties (drag and lift simultaneously) of the simplified human body parts under a range of angles of attack ( ) to simulate athlete's body positions. Hence, the experimental setup used by Chowdhury and others can only measure the drag and lift of cylindrical within a limited range of angles of attack (30° to 90°).…”

Section: Introductionmentioning

confidence: 99%

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A Cylindrical Methodology for the Study of Fabric Aerodynamics

Moria

Chowdhury

Aldawi

et al. 2013

Procedia Engineering

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The understanding of aerodynamic behavior of sports garments in high speed sports can lead to achieve higher efficiency and performance.in order to understand the aerodynamic behavior of fabrics used in speed sports garments, prior studies have mainly used the vertical cylindrical methodology in wind tunnel environments. However, using the vertical cylindrical methodology, the aerodynamic behavior of sports garments cannot be fully realistic as athlete's all body parts are not positioned vertically all the time. Limited information is available on cylindrical methodology that can provide aerodynamic characteristics of fabrics under inclined positions. Therefore, the primary objective of this study is to develop a cylindrical methodology that can be used for both vertical and inclined positions. The suitability of the developed method for the fabrics is investigated using a wind tunnel. The results indicated that the developed methodology suited well and provided detail aerodynamic information about the fabric used.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

A Cylindrical Methodology for the Study of Fabric Aerodynamics

Moria

Chowdhury

Aldawi

et al. 2013

Procedia Engineering

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“…A three-component force balance (LMC-3501, NISSHO-ELECTRIC-WORKS) was used to measure the aerodynamic forces acting on the fabric-clothed elliptic cylinder. The freestream velocity (U) was set at 20 m/s, which was chosen based on the take-off speed for large-hill ski jumping [5]. The Reynolds number of the elliptic cylinder, based on a chord length of c = 70 mm, was 1.0 × 10 5 at U = 20 m/s.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

“…Various studies have been conducted to improve the aerodynamic characteristics of ski jumping suits. Chowdhury et al have studied the differences in aerodynamic characteristics when suit fit and the surface shape of the fabric are changed [2,3]. However, no studies have been conducted on the effects of the air flow rate though the fabric on the aerodynamics and the stall characteristics of the elliptic cylinder.…”

Section: Introductionmentioning

confidence: 99%

Flow Behavior Caused by Air Permeability of Ski Jumping Suit Fabric

Kataoka

Hasegawa

Murakami

et al. 2020

The 13th Conference of the International Sports Engineering Association

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The purpose of this study was to investigate the effect of the air permeability of ski jumping suit fabric on aerodynamic characteristics. In the study, four types of fabric with different air permeabilities were installed onto a fabric-clothed elliptic cylinder, and the flow behavior around its surface was investigated through wind tunnel experiments. The stall was delayed by using the fabric with higher air permeability. The air flow permeated the surface of the elliptic cylinder through the fabric for the fabric with high air permeability. This air flowed out into the separation region through the fabric again, which suppress stall. The stall characteristics for the fabric-clothed elliptic cylinder were influenced by the air permeability of the fabric. The boundary layer thickness on the outer surface and the turbulence levels of the boundary layer affected the air permeability of the fabric. The higher air permeability fabrics improved the stall characteristics.

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“…Given the posture of a cyclist model fixed, this study aims to examine the effect of textile roughness on delaying flow separation on the contoured surface. In the literature, a number of studies have modeled the flow phenomenon using single circular cylinder or multiple circular cylinders roughened with textile materials (Chowdhury et al, 2009(Chowdhury et al, , 2014Oggiano et al, 2007Oggiano et al, , 2009. Recently, Hsu et al (2019) performed an experimental work with 38 fabric samples tested on a circular cylinder in a wind tunnel experiment, and concluded that the roughness of the textile materials could be expressed in terms of the Nikuradse's sand-grain roughness (Nikuradse, 1937).…”

Section: Introductionmentioning

confidence: 99%

A study of drag reduction with textile roughness on a cyclist model

Hsu

Miau

et al. 2021

The Journal of The Textile Institute

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Efforts were made to examine the effect of textile roughness for the reduction of aerodynamic drag experienced on a cyclist model. First of all, flow visualization experiments were conducted in a water channel with a 1/5 scale cyclist model to identify the flow separation lines on the contoured surface. Subsequently, based on the information learned, the idea of delaying flow separation on the model surface was implemented by means of sport suits. Seven sport suits featuring different textile materials and local roughness patterns were tested on a full-scale cyclist model in wind tunnel experiments, in addition to a reference case without a sport suit. From the C D data deduced, we identified a critical condition in most of the cases studied, featuring a least drag coefficient occurred at a Reynolds number within the flow speed range studied. For the best case found, the drag coefficient is amounted 7.5% less than that of the reference case at the same Reynolds number. Furthermore, the C p and C prms values reduced from the pressure measurements on the cyclist model with the sport suits unveil a trend that the reduction of drag actually infers the retreat of the local flow separation lines toward the rear side of the body accompanied with less severe the flow unsteadiness.

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Design and methodology for evaluating aerodynamic characteristics of sports textiles

Cited by 18 publications

References 5 publications

A Cylindrical Methodology for the Study of Fabric Aerodynamics

A Cylindrical Methodology for the Study of Fabric Aerodynamics

Flow Behavior Caused by Air Permeability of Ski Jumping Suit Fabric

A study of drag reduction with textile roughness on a cyclist model

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