Hot-Wire Measurements of Velocity and Temperature Fluctuations in a Heated Turbulent Boundary Layer.

摘要

This paper describes the development of a multi-element hot-wire anemometry system designed to measure a wide variety of fluctuating velocity and temperature quantities in non-isothermal boundary layer flows. Descriptions of the design and evaluation of the multi-element probes and the analog-digital data recording and analysis system are included. Special features of this system were: (1) that the hot-wire probes employed sensors of reasonably practical size (2.5 microns dia.); and (2) that only standard, commercially available constant-temperature anemometers were utilized. Sample data, including Reynolds stress and turbulent Prandtl number distributions, demonstrate that boundary layer turbulence statistics were measured accurately with this system. (Author)