Helical-groove and circular-trip effects on side force

Kim-Boon Lua*, T. T. Lim, S. C. Luo, E. K.R. Goh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


When a slender body, such as a missile, is pitched at high angle of attack to an oncoming flow, it may experience a large side force due to the asymmetric shedding of the tip vortices. The side force is well known to be highly detrimental to the performance of the flight vehicle. We assess the effectiveness of two control devices, namely, the circular trips and the helical grooves, in alleviating the side force on a tangent ogive nose cylinder. Simultaneous side force and pressure measurements taken in a wind tunnel show that the circular trip is generally more effective in reducing the side force than the helical grooves over a wide range of angle of attack. Detailed findings of their performances are reported.

Original languageEnglish
Pages (from-to)906-915
Number of pages10
JournalJournal of Aircraft
Issue number5
StatePublished - 1 Jan 2000


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