STEADY AND PULSATING TWO-DIMENSIONAL, TURBULENT WALL JETS IN A UNIFORM STREAM.
PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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For the case of the steady, plane turbulent wall jet, the growth of the jet and decay of maximum velocity are predicted based upon the assumption that the shear stress distribution as well as the velocity distribution across the jet remain similar over the useful range of downstream positions. A suggested form for the velocity distribution is compared with the experimental results of this investigation and with the results of several previous investigators. The approach used in the analysis of the plane turbulent wall jet is then extended to the more general case of a steady turbulent wall jet beneath a secondary uniform stream. The experimental results of this investigation and other previous investigations are compared with the velocity profiles as predicted by the analysis. The case of a pulsating wall jet flow field was also analyzed a simplified theoretical model is presented based upon the experimentally observed discrete vortex pattern produced by the unsteady jet. The analysis for both zero and nonzero secondary flow velocity relies to a large extent on many of the results of potential flow theory and the known characteristics of turbulent vortex structure. Experimental data consisting of instantaneous velocity measurements obtained by means of a hot-wire anemometer system and information obtained from visual flow field studies are compared with the results of the theoretical analysis. Author
- Fluid Mechanics