Behavior of Air Jet Impinging on Curved Surfaces
Publication: Journal of Aerospace Engineering
Volume 27, Issue 5
Abstract
Impinging jets on the curves surfaces and flat plate are frequently used in industrial practice requiring studying the subatmospheric zone. It is important to understand the structure of behavior impinging jet on the flow fields. Same of prior researchers have concluded that a recirculation zone occurs on the impingement flat plate. This recirculation zone creates subatmospheric pressure at the impingement surface. This study has been made to investigate the effects of nozzle to plate spacing, the Reynolds number and changing of the surface shape on subatmospheric region which occurs on these impingement surfaces. The subatmospheric region could be very important in engineering application. It is hoped that this study will provide data for the further research on this subject. In the present study the air jets from convergent circular nozzle of 10-mm exit diameter have been allowed to impinge normally on a flat plate, hemispherical, and conical surfaces. Experiments were done with varying the stagnation pressure from 1.2 to 2 bars. Reynolds number based on the nozzle exit diameter for this range of stagnation pressure was changed from to . The distance between the nozzle exit plane and the test surface was varied from 10 to 80 cm. Measurements of static and total pressure were made by the help of pressure taps made on the test surfaces and a pitot tube. The numerical simulations were performed by the solution of Reynolds—Averaged Navier-Stokes equations with a model. Behaviors of the impinging jets were compared with those of a free jet. The flow field was found to be dependent on the stagnation pressure, spacing between the nozzle and impinging surface, and the impinging surface geometry. A comparison of the predicted behavior of the jet with those obtained from experimental results gives a good agreement.
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Published In
Journal of Aerospace Engineering
Volume 27 • Issue 5 • September 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 26, 2011
Accepted: May 15, 2013
Published online: May 17, 2013
Published in print: Sep 1, 2014
Discussion open until: Oct 15, 2014
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