2nd Shear Flow Conference 1989
DOI: 10.2514/6.1989-994
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Shear flow control by mechanical tabs

Abstract: This paper discusses results of an experimental study on jet-mixing enhancement of heated and unheated, subsonic and underexpanded supersonic model jets bj mechanical protuberances (tabs) located at the nozzle lip. It is shown that considerable mixing enhancement is obtained by these devices. Relative performance of two, three, and four tabs is also evaluated. It is found that the best overall effect is produced by two tabs located diametrically opposite to each other. Limited temperature measurements indicate… Show more

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Cited by 136 publications
(61 citation statements)
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“…For the current series of tests, the rig is fitted with a separate flow exhaust model with primary and secondary exit areas of 23.23 cm 2 and 80.65 cm 2 respectively. A photograph of the baseline nozzle model is shown in Fig.…”
Section: Methodsmentioning
confidence: 99%
“…For the current series of tests, the rig is fitted with a separate flow exhaust model with primary and secondary exit areas of 23.23 cm 2 and 80.65 cm 2 respectively. A photograph of the baseline nozzle model is shown in Fig.…”
Section: Methodsmentioning
confidence: 99%
“…The exit shape of the jet is altered in order to passively enhance the threedimensionality of the flow, and thus entrainment and mixing, there have been many efforts devoted to investigating the properties of jets emerging from non-circular nozzles. For example, using a tabbed nozzle generates streamwise vortices in the jet flow, and several studies have reported results for variations in flow field conditions, as well as tab shape, size, number and angle (Ahuja and Brown (9) , Bradbury and Khadem (10) , Samimy et al (11) , Zaman et al (1), (12), (13) , Grinsten et al (14) , Toyoda et al (15) ). In the present work, the interaction between axisymmetric and streamwise vortices in the unexcited and excited coaxial jet was studied experimentally.…”
Section: Introductionmentioning
confidence: 99%
“…The study of coupled interaction of o -o x using delta tabs, as a means of generating streamwise vorticity, is experimentally conducted. [11][12][13][14] Zaman et al 15 recently wrote an excellent review of this topic. The role of swirl in free turbulent jets is to trigger centrifugal instability, set up radial pressure gradient and thus promote mixing.…”
Section: Introductionmentioning
confidence: 99%