MEASUREMENTS OF TURBULENT QUANTITIES IN A COMPLEX 3-DIMENSIONAL BOUNDARY-LAYER FLOW

Measurements of the Reynolds stress tenser have been conducted with di fferent techniques in the complex turbulent boundary layer of a curved duct, where the flow is changing from two-dimensional into a fully th ree-dimensional condition. Single-, cross-and triple-hot-wire probes a nd a silicon based double-chip sensor were employed for measurements a t a Reynolds unit number of 1.2 x 10(6) per meter. The Reynolds stress es were measured at a reference station in the two-dimensional part of the duct, and at five stations in the three-dimensional flow. Profile s of the different techniques were compared, and a good agreement was generally obtained between the investigated methods; however, deviatio ns in certain parts of the profiles, due to prongs, probe body interfe rence and influence of the size of the measuring volume were noted.