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	Turbulent round jet control using two steady mini -jets
	Du, C. ; Zhou, Y. ; Mi, J.
	2010
英文摘要	This study investigates experimentally the near-field characteristics of a turbulent round jet under the disturbance of two steady radial mini-jets injected from opposite sides. The exit Reynolds number (Re) of the jet is 8,000. The flow rate ratio (Cm) of the mini-jets to the main jet varies from 0 to 16.5%. It is found that the centerline velocity decay rate of the main jet is accelerated with increasing Cm until Cm 12% and then decelerated for a further increase in Cm; meanwhile, the jet spread rate is highest around Cm 12% in the plane orthogonal to the mini-jet injection plane, though exhibiting little change in the injection plane. An exploration of connection between the perturbed jet and flow immediately downstream of the impact region of the blowing mini-jets points out that the blowing mini-jets generate a predominant quasi-periodical structure in flow prior to issuing from the nozzle exit. The observation is in contrast to the quasi-steady longitudinal counter-rotating vortex pairs, previously reported at Re = 1,000 ?? 1,500. The structure plays an important role in altering the flow structure and subsequently in enhancing the centerline velocity decay rate and jet spread rate in the near field of the perturbed jet.; EI; 0
语种	英语
内容类型	会议论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/316938]
专题	工学院
推荐引用方式 GB/T 7714	Du, C.,Zhou, Y.,Mi, J.. Turbulent round jet control using two steady mini -jets[C]. 见:.

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