Experimental Measurements in the Turbulent Boundary Layer of a Yawed,Spinning Ogive-Cylinder Body of Revolution at Mach 3.0. Part I. Description of the Experiment and Data Analysis.

摘要

Many projectiles used by the Army are slender, spin stabilized bodies of revolution. The distorted boundary layer, which results from a spinning body at angle of yaw, generates Magnus forces and moments. The BRL is conducting and supporting theoretical and experimental magnus research efforts. Experimental results of surveys of the turbulent boundary layer on a secant-ogive-cylinder at angles of attack up to 6 degrees for spin rates of 0 and 333 rps at Mach = 3 are presented in this report. Limited comparisons of the data to finite-difference three-dimensional boundary layer computations indicate encouraging agreement. The theory is shown to accurately model the effects of surface spin and the main effects of surface spin are shown to occur near the lee side of the model. Complete data tabulations are provided in Part II to facilitate their use for comparison to theoretical computations. (Author)