CONTROL OF VORTEX INTERACTIONS IN A REATTACHING SEPARATED FLOW | ||||
| ERJ. Engineering Research Journal | ||||
| Article 5, Volume 30, Issue 2, April 2007, Page 149-159 PDF (827.89 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2007.70050 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Gamal H. Moustafa | ||||
| Mechanical Power Engineering Department, Faculty of Engineering, Minoujya University, Shebin El-Kom, Egypt | ||||
| Abstract | ||||
| Several experimental studies have shown that large scale orgamed vortex rings are produced in reattaching separated flows. Understanding of the interactions between these vortex rings are much important in the development of such flows in the downstream. An experimental work from a backward facing step have been made in the control of mixing by the use of techniques that affect the behavior of the vortex formed in the recirculating zone. Active controlling in the form of periodic flow perturbations caused by changing the step angle has been found to be effective in forming the flow over backward facing step by encouraging 1 &scouraging pairing of the large scale structures that are responsible for much of the entrainment. Also, such a technique allows higher pressure at the base and hence low base drag which may provide useful design guidance for perojectiles. A finite difFerence solution using boundary layer equations with marching technique was also performed for comparison with experimental results. A flow visualization gives some idea for the spreading of the flow over the step. Applying the present active mixing control technique leads to a shorter reattachment length and faster spreading which is particularly important in dump combustors, since a shorter recirculating zone allows a shorter overall design of the system. | ||||
| Keywords | ||||
| backward facing step; recirculating zone; reattachment length; finite difference; flow visualization | ||||
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