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Turbulent flow structure in the near field of a swirling round free jet
Ist Teil von
The Physics of fluids (1958), 1985-07, Vol.28 (7), p.2075-2082
Ort / Verlag
Woodbury, NY: American Institute of Physics
Erscheinungsjahr
1985
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Turbulent flow structure in the near field of a swirling round free jet is experimentally and theoretically investigated in a low‐speed wind tunnel. The experiments are conducted in a slightly heated swirling jet with an irrotational, low‐speed, coflowing stream. Velocity and temperature are simultaneously measured using a laser Doppler anemometer and a resistance thermometer, respectively. The results show that in a strongly swirling jet, the ambient fluid is rapidly entrained into the jet in the region near the convergent nozzle exit. The entrainment rate shows a value about twice as large as that in a nonswirling jet, even in the immediate vicinity of the nozzle exit. This rapid entrainment is attributed to the recirculating flow which is formed by the adverse pressure induced to balance the strong centrifugal force. The flow structure is compared with the numerical predictions based on a two‐equation model of the type k‐ε. The predictions and experimental results both agree well.