COMPRESSIBLE FREE SHEAR LAYER WITH FINITE INITIAL THICKNESS

1) Experimental determination of the exponential coefficient in the growth law for a turbulent wake is very difficult, if not impossible. 2) If use is made of the theoretically predicted value of this coefficient, the existence of two distinct regions of growth (x 200) is shown by the experimental data. 3) Although the Slattery and Clay data indicate a scale effect for J-and \in. spheres, the authors \and J-in. sphere data indicate at most a much weaker scale effect. 4) It is important to fit the data with the proper algebraic expression of the theoretical growth law, i.e., r = bx + c. 5) If the effect of sphere deceleration is assumed to be described by a quasi-steady state transformation,:the coefficient 6 for the far wake is well predicted by the Lees-Hromas theory.