Even though the tab can be implemented actively, it can be protruded into the flow or withdrawn according to the requirement. However, the disadvantage associated with a tab-controlled jet is the thrust penalty. With this in mind, various tab configurations in small- and large-scale models were evaluated and obtained encouraging results for jet noise reduction. In the mid-1990s, the investigations on tab-controlled jets received serious attention due to the practical implications of stringent noise regulations. Interestingly, these studies revealed that the tab could reduce the jet plume and turbulent mixing noise, a primary part of aircraft jet noise. At the same time, several researchers put effort into understanding the underlying flow mechanism behind the tab-controlled jets. In the late 1980s, extensive studies of the tab-like vortex generators for mixing enhancement were carried out. Over the last 40 years, there have been several experimental studies on tab-controlled jets. Finally, the future direction of research on the tab-controlled jets is outlined. The detrimental effect of tabs in terms of thrust penalty is described. Subsequently, their effect on noise suppression is also reviewed. Following a brief introduction about subsonic and supersonic circular jets, this study discusses the influences of certain key parameters on mixing characteristics, including the effect of tab geometry, tab number, tab orientation, tab size, and tab position relative to nozzle outlet. Here, both the experimental and the numerical investigations on the impacts of tabs on the mixing enhancement and noise suppression are presented. A detailed description of various features of the circular jets controlled by tab-like vortex generators is provided. This study provides an overview of the tab-controlled jets to understand and predict the influence of mixing promoting vortices at speeds ranging from subsonic to supersonic. 4Department of Automation, Technical University of Cluj-Napoca, Cluj-Napoca, Romania.3Department of Physics and Chemistry, Technical University of Cluj-Napoca, Cluj-Napoca, Romania.2Department of Electrical Engineering, Institute of Infrastructure Technology Research and Management (IITRAM), Ahmedabad, India.1Department of Aerospace Engineering, Indian Institute of Technology Kharagpur, India.Thillaikumar Thangaraj 1 Mrinal Kaushik 1 Dipankar Deb 2* Mihaela Unguresan 3 Vlad Muresan 4
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