An Evaluation of the Heat Pulse Anemometer for Velocity Measurement in Inhomogeneous Turbulent Flow

A velocity measuring probe that creates a train of heat pulses at one point in the flow and detects their arrival at a sensing wire a short distance downstream has been developed for the measurement of turbulent flows of unknown composition. In such a turbulent flow the detected pulses are highly disturbed, but reconstruction of a mean pulse, by digital computer, from several hundred pulses enables calculation of a mean velocity and a velocity fluctuation level. To illustrate the application of this technique, velocity profiles were measured in inhomogeneous turbulent jets over a wide range of jet ambient density ratios.