No abstract

In this paper, the semi-empirical laws of King and Jørgensen are adopted as the starting point for modelling the voltage output response of a single normal hot wire. The single fact of having released the King law exponent n in the factor expressing the orientation effects increases significantly the accuracy of the modelling; then the parameter k is only slightly dependent on the orientation of the hot wire in the flow.

In this note we adopt the semi-empirical laws of King and Jørgensen to model the angular voltage output response of a single yawed hot-wire probe placed in a flow perpendicular to its axis. As in our previous work, the King exponent n is reformed into the parameter in an expression for orientation effects. The result is a model of the voltage output response, accurate to a few per cent over the whole range of orientation angles.

An experimental investigation of the flow over a one at a large angle of attack is reported. First, the study was focused on the wall shear stress measurement, including the localization of the separation. Secondly, the mean flow field in the whole wake of the cone was measured, as well as the velocity fluctuations. Results indicate that the separation and the fluctuations are asymmetrical in a certain way, whereas the mean flow field is approximately symmetrical. Finally, the different parts of the flow can be easily determined using vorticity calculations.