Abstract
The turbulent boundary-layer flow developed on a two-dimensional deLaval nozzle wall was systematically evaluated in terms of its transport properties. The turbulent shear stress, eddy viscosity, mixing length, and turbulent Prandtl number distributions were computed by the time-averaged conservation equations using measured mean-flow inputs. The measurements were obtained in the NOL Boundary-Layer Channel and contained controlled variations of heat transfer, Reynolds number, and pressure gradients. Definite trends relating upstream cooling, pressure gradient, Reynolds number, and heat transfer to the shear stress, eddy viscosity, mixing length, and Prandtl number were observed. In addition, a strong influence of the upstream history effect was observed in all the turbulence terms except the Prandtl number. This effect can be related to the removal of thermal energy upstream. Comparison of the turbulent shear stress with the laser-doppler velocimeter measurements showed disagreement between the measured and computed values in the inner portion of the boundary layer.
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