Improvements to the NSWC Aerodynamics Prediction Program of Particular Significance for Bombs.
Abstract
During use of the NSWC missile aerodynamics prediction program, a number of deficiencies have been found. Because these deficiencies are important on bombs, simple but effective corrections have been devised. Details are given of a revised expression for boattail normal force at subsonic and transonic speeds. This is necessary because the program gives normal force results that are much too large in magnitude when the base diameter is small. Also included is a correction for boattail centre of pressure. In order to cope with fuses and lugs on bombs, allowances have been devised for truncated nose viscous separation pressure drag at subsonic and transonic speeds, and for excrescence drag at all speeds. The program includes an allowance for viscous separation drag at the nose shoulder, at transonic speeds. Finally, a correction has been included to account for the wave drag due to large amounts of nose blunting, including the region near the drag-rise Mach number. Comparisons are made with experimental data from a number of sources, in order to show that the modified program is effective and useful. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1980
- Accession Number
- ADA087769
Entities
People
- L. M. Sheppard