Incremental Drag due to Grooves and Threads for KE (Kinetic Energy) Projectiles
Abstract
A prediction method for estimating the increment of increase in the drag coefficient due to the grooves on the surface of the body of a kinetic energy projectile is established based on wind tunnel data. Known existing methods give very poor results when compared to the experimental data. Twenty cases were considered for the present correlations and validation. The results achieved are very satisfactory. The present analysis considers parameters not included in the existing methods: the groove pitch (or alternately the groove depth); and multi-groove types residing on the same projectile body. The groove drag decreases very rapidly with the increase in Reynolds number and also decreases considerably with the increase in Mach number. The range of validity of the present expressions coincides with the usual KE projectile requirement, which established the Mach number range to be 3.5 < M < 5.5 and -alpha = 0 deg.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1989
- Accession Number
- ADA206566
Entities
People
- Ameer G. Mikhail
Organizations
- Ballistic Research Laboratory