Design of a Film-Cooled Entraining Diffuser.
DEFENCE RESEARCH ESTABLISHMENT SUFFIELD RALSTON (ALBERTA)
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A film-cooled entraining diffuser is described which consists of a series of staged cylindrical rings, each overlapping the adjacent one so as to create annular slots for the entrainment of surrounding ambient air. A two-step iterative design procedure is outlined. In step one an analysis similar to that first employed by von Karman is used to calculate the rate at which air is drawn into each slot. In step two these flow rates are used in a downstream-marching, iterative, implicit finite-difference method to calculate the development of wall jet boundary layers downstream of the slots. Details about the design and manufacturing of a three-ring model structure are presented and proposed future experimental validation is discussed. Author
- Air Conditioning, Heating, Lighting and Ventilating
- Fluid Mechanics