BOUNDARY.LAYER VELOCITY PROFILES AND SKIN FRICTION DUE TO SURFACE ROUGHNESS ON AN OGIVE CYLINDER AT MACH NUMBERS OF 1.61 AND 2.01

摘要

An investigation has been made at Mach numbers of 1.6l and 2.01 and over a range of free-stream Reynolds number per foot from about 2.4 X 10° to 7.1 X 10 to determine the boundary-layer velocity profiles and skin-friction drags due to two-dimensional fabrication-type surface roughness. Nine types of surface roughness, including step, wave, crease, and swept configurations were investigated. The tests were made on an ogive cylinder of fineness ratio 12.2, the roughness elements covering the cylindrical portion of the model.nThe results indicate that the velocity profiles for both the smooth models and models with surface roughness (exclusive of those for the models with the largest roughness, and for which the data cannot be interpreted) tend toward agreement with the l/7- and l/8-power velocity distributions.