Survey of Measurements and Measuring Techniques in Rapidly Distorted Compressible Turbulent Boundary Layers

摘要

A large body of data for incompressible turbulent boundary layers has been accumulated over many years by many investigations. The measurements have revealed elements of the structure of this complex flow. Three-dimensional multiple scale phenomena have been observed, and there is the beginning of an understanding of the details of the structure and physics. This will lead to more realistic models and physical understanding, which will be primary inputs into concepts of control of these turbulent boundary layers and will provide a framework to validate computations. At high speed, where compressibility is important, there is a paucity of data. The measurements are difficult to obtain and are not easily analyzed. At the same time, there appear to be some possibilities for simplification inherent in rapid distortion theory where the turbulent structure may be frozen if the disturbance is of short duration. There is a critical need for data to evaluate this concept, to provide a base for models of turbulence in compressible flows to compare with imcompressible flows, to provide a more substantial base for our physical understanding, and to provide a framework for the evaluation of the extensive computations which are currently underway. Contents: Rapidly Distorted Compressible Boundary-Layers; Large Scale Motions in Supersonic Turbulent Boundary Layers; Skin-Friction Measurements by Laser Interferometry; Hot-Wire Anemometry in Supersonic Flow; Laser Doppler Anemometry; Laser Doppler Anemometry in Supersonic Flows:Problems of Seeding and Angular Bias; and Fluctuating Wall-Pressure Measurements. (jhd)