JSME International Journal Series B Fluids and Thermal Engineering
Online ISSN : 1347-5371
Print ISSN : 1340-8054
ISSN-L : 1340-8054
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Control of an Oscillatory Rectangular Cavity Jet Flow by Secondary Injection
Mauro Parreira ARRUDANicholas John LAWSONMalcolm Roderik DAVIDSON
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2006 Volume 49 Issue 4 Pages 1105-1110

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Abstract

A method for controlling the position of an oscillatory cavity jet flow is demonstrated. The method involves secondary injection of a lower mass flow control jet into the cross-flow region of the primary jet. The primary jet in this case is a turbulent jet (Re=55000) which when injected into the rectangular cavity with no secondary control, attains a stable oscillation with a characteristic Strouhal number of St, W=0.013. The injection control method is investigated using a combined experimental and numerical approach with a water model test rig and a 2D and 3D computational fluid dynamics (CFD) model. Based on previous work, a baseline cavity, with a depth to width ratio of H/W=0.16 and entry nozzle submergence of S/W=0.38, is used to study the effect of secondary jet injection parameters on primary jet deflection angle (δ) as a function of momentum ratio (β ) and injection position (Yi). Results have shown primary jet deflection angles (δ) of up to 15° for a momentum ratio (β ) of 20% can be achieved for a secondary jet injection position of Y1/W=0.12.

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© 2006 by The Japan Society of Mechanical Engineers
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