MEASUREMENTS OF THE KOLMOGOROV CONSTANT AND INTERMITTENCY EXPONENT ATVERY HIGH REYNOLDS-NUMBERS

Characteristics of turbulence in the inertial range are experimentally studied in the atmospheric surface layer over the range of the Taylor microscale based Reynolds number R(lambda)approximate to(2.8-12.7)X10 (3) and in a large wind tunnel (in a mixing layer at R(lambda)approxim ate to 2.0X10(3) and a return channel at R(lambda)approximate to 3.2X1 0(3)). The intermittency exponent mu, estimated from the correlation f unction of energy dissipation R(epsilon epsilon)(r)=[epsilon(X)epsilon (X+r)] (proportional to)r(-mu), is found to be independent of Reynolds number and approximately equal to 0.20. No ''measurable'' deviation f rom the -5/3 exponent in the ''five-thirds'' law is found. On the othe r hand, the Kolmogorov constant C in this law is found to be weakly de pendent on R(lambda). This dependence is well described by the power l aw C(proportional to)R(lambda)(-mu/2)approximate to R(lambda)(-010) at mu approximate to 0.20.