Accession Number : ADA258753
Title : Improved Empirical Model for Base Drag Prediction on Missile Configurations Based on New Wind Tunnel Data.
Descriptive Note : Final rept.,
Corporate Author : NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
Personal Author(s) : Moore, Frank G ; Wilcox, Floyd ; Hymer, Tom
Report Date : Oct 1992
Pagination or Media Count : 57
Abstract : New wind tunnel data have been taken, and a new empirical model has been developed for predicting base drag on missile configurations. The new wind tunnel data were taken at NASA/LaRC in the Unitary Plan Wind Tunnel at Mach numbers from 2.0 to 4.5, angles of attack to 16 deg, fin control deflections up to 20 deg, fin thickness-to-chord (t/c) ratio of 0.05 to 0.15, and fin locations flush with the base to two chord lengths upstream of the base. The newly developed empirical model uses these data along with previous wind tunnel data. It estimates base drag as a function of all the above variables along with boattail and power-on or power-off effects. In comparing the new empirical model to that used in the former aeroprediction code, the new model gives improved accuracy over wind tunnel data. The new model also is more robust due to inclusion of additional variables. On the other hand, additional wind tunnel data are needed to validate or modify the current empirical model in areas where data are not available.... Empirical model, Missile configuration, Wind tunnel, Base drag prediction.
Descriptors : *AERODYNAMIC CONFIGURATIONS , *GUIDED MISSILES , *FINS , *SUPERSONIC DRAG , CONTROL , RATIOS , THICKNESS , PREDICTIONS , MODELS , DEFLECTION , ANGLE OF ATTACK , INCLUSIONS , CONFIGURATIONS , AERODYNAMIC DRAG , POWER , MACH NUMBER , WIND TUNNELS , WIND TUNNEL MODELS
Subject Categories : Guided Missile Dynam, Config & Cntrl Surfaces
Distribution Statement : APPROVED FOR PUBLIC RELEASE