A method of correction for the binormal velocity fluctuation using the look-up inversion method for hot-wire anemometry

This paper concerns the interpretation of the time averaged signals from a crossed hot-wire probe and the development of a related look-up inversion m ethod. By making use of the look-up inversion method, an accurate calibrati on relationship for the crossed hot-wire probe is obtained. In standard sig nal analysis methods it is assumed that the mean binormal velocity componen t (W) over bar and its fluctuations omega ' are both equal to zero. However . in turbulent flows, the fluctuations of the binormal velocity component a re not equal to zero. This may lead to large errors in the measured Reynold s stresses. In the present study. a correction method is applied to take th e effect of the fluctuating binormal velocity component into account. An as sessment of the accuracy of standard signal analysis methods is given. It i s demonstrated that the influence of the fluctuating binormal velocity comp onent cannot be neglected if accurate flow measurements are required.