Parametric study of a two-dimensional turbulent wall jet in a movingstream with arbitrary pressure gradient

Abstract

Measurements of flow parameters for a two-dimensional turbulent wall jet are presented in a range of ratios of slot stream velocity to external stream velocity with pressure gradients, not previously investigated. These data are utilized for the calculations of wall shear and shear distribution by numerical methods. Relationships among the parameters are considered. Nomenclature= similarity function for velocity profile in the jet layer in initial region /fe) = similarity function for velocity profile in the wake layer in the initial region f(w) = similarity function for velocity profile in the jet layer in main region f(n±) = similarity function for velocity profile in the wake layer in the main region # = form factor or pressure gradient parameter H = ratio of dissipation energy thickness and momentum thickness M = Mach number PST = wall static pressure, lbf/ft 2 PT = Pitot tube total pressure, lbf/ft 2 Poo = freestream pressure lbf/ft 2 R e e = Reynolds number based on wall layer momentum thickness U c = velocity in the core layer in the initial region, fps U c (o) = slot velocity at the exit, fps U e (x) = velocity at the edge of viscous layer, fps U e (o) = velocity at the edge of viscous layer at the slot exit, f p s U w (x) = velocity at the junction of jet layer and wake layer, fps U m (x) = velocity at the junction of wall layer and jet layer, fps C/oo = freestream velocity, fps u = X component of velocity in viscous layer, fps v = Y component of velocity in viscous layer, fps

Investigation of a Compound Wall Jet in the Vicinity of Jet Exit

“…A number of basic investigations were conducted by Eskinazi and Kruka [4], Kruka and Eskinazi [5], Patel and Newman [6], Goradia and Colwell [7], and Kacker and Whitelaw [8] on plane turbulent compound wall jets. It may be concluded from their findings that the velocity profile in the boundary layer and free-mixing regions are similar if considered separately.…”

“…It may be concluded from their findings that the velocity profile in the boundary layer and free-mixing regions are similar if considered separately. Goradia and Colwell [7], and Erian and Eskinazi [9] found that, even with pressure gradients, similarity of velocity profiles exists if each distinct region is considered separately.…”