The Influence of Process Parameters on the Forming of Riblets during Riblet Rolling

Abstract

In aeronautics, economic and environmental aspects become increasingly important. As those are very much influenced by the frictional drag of the airplane, a reduction of skin friction which causes a major portion of total aerodynamic drag is desirable. One possible approach for passive drag reduction is the application of riblets small longitudinal grooves orientated in flow direction. Through an adapted rolling process, riblets can be brought into metal sheets on a large scale. For this process a thin high-strength steel wire is wound around a work roll to structure it with the negative riblet imprint. In a subsequent step the riblet profile is rolled into the sheet material. Different parameters can influence the process and the quality of the resulting riblet structure. Those parameters that depend on the sheets sheet thickness, material strength, and composition of the sheet are discussed in this paper. Form filling is used as an indicator for riblet quality. It is found that decreasing sheet thickness is beneficial for form filling, but a process dependent minimum sheet thickness exists for which this effect will reverse. Material strength is found to have a much smaller influence on form filling. Nevertheless, harder alloys seem to need a slightly smaller thickness reduction, but higher rolling forces and pressures to achieve desired form filling. Using clad instead of bare materials has a positive influence on form filling and riblet structuring. Furthermore, riblet rolling does not reduce the fatigue strength of the clad material.

Turbulent drag reduction by spanwise traveling ribbed surface waves

“…1). Details of the manufacturing process of the riblets are discussed in [41]. The overall thickness of the riblet sheet is 0.4 mm at the riblet valley and 0.7 mm at the crest.…”

Fatigue Behavior of Riblet Structured High Strength Aluminum Alloy Thin Sheets at Very High Cycle Numbers

“…Sheets were structured with semi-circular riblets by a rolling process, as described in [17,18]. A detailed assessment of influencing factors on the riblet structuring process of AA 2024 is provided in the study by Pöplau et al [19]. Riblet rolling was performed along the rolling direction of the sheets (L-direction).…”