Curvature Effects on Two-dimensional Turbulent Wall Jets along Concave Surfaces

Abstract

The purpose of this paper is to study experimentally the curvature effects on the temporal mean and turbulence characteristics of two-dimensional turbulent wall jets along concavely curved surfaces with constant radii of curvature. The surface curvature adopted ranges over b/R=0∼0.1, where b is the half width of the wall jet and R is the radius of surface curvature. The turbulent energy balance in the wall jets is obtained by measuring advection, production and dissipation of the turbulent energy. It shows that their nondimensional magnitudes of the turbulent energy decrease as the surface curvature increases. The effects of curvature on the time-and space-correlations of fluctuating velocities are also considered.