Constant temperature hot wire anemometers practice in supersonic flows. Part 2: the inclined wire.

The performance of a constant temperature inclined hot wire in a supersonic flow is critically examined. It is shown that empirical heat transfer correlations commonly used for calibrating hot wires in subsonic flow cannot be used when the flow is supersonic. Calibration and measurement procedures appropriate to supersonic flow are suggested, together with the possible limits on their validity. The instrument was use to measure the mass weighted Reynolds shear stress in a zero pressure gradient Mach 2.9 turbulent boundary layer. A comparison with the available data suggests good agreement, as long as the normal Mach number remains supersonic under all conditions. (A)