Real-time measurements of turbulence quantities with a triple hot-wire system

Three orthogonal hot-wire anemometers with individual linearizers have been used to measure turbulence quantities in highly turbulent flows whose mean-flow direction is not well known. A network of high-speed analog devices simultaneously processes, in real time, signals from the triple hot-wire system. Instantaneous values of the velocity components are either processed by a digital computer or introduced into a second analog network which provides, again in real time, mean and fluctuating velocity components, as well as double or triple correlations. The triple-wire probe shows good acceptance of turbulence quantities in the central region of a channel, but probe size diminishes turbulence data acceptance near the wall.