Abstract
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. A detailed description of various features of the circular jets controlled by tab-like vortex generators is provided. Here, both the experimental and the numerical investigations on the impacts of tabs on the mixing enhancement and noise suppression are presented. 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. Subsequently, their effect on noise suppression is also reviewed. The detrimental effect of tabs in terms of thrust penalty is described. Finally, the future direction of research on the tab-controlled jets is outlined.
Highlights
Over the last 40 years, there have been several experimental studies on tab-controlled jets
The broadband noise can be generated in the jet mixing layer when the large-scale structures communicate with the shock cells
3.3.1 Tab Orientation Angle on Jet Mixing This section deals with the effect of the orientation angle of the tab at the nozzle exit
Summary
Over the last 40 years, there have been several experimental studies on tab-controlled jets. Several researchers put effort into understanding the underlying flow mechanism behind the tab-controlled jets. These studies revealed that the tab could reduce the jet plume and turbulent mixing noise, a primary part of aircraft jet noise. In the mid-1990s, the investigations on tab-controlled jets received serious attention due to the practical implications of stringent noise regulations. The tabs are widely used to reduce screech and broadband noise in shock-containing supersonic jets. The broadband noise can be generated in the jet mixing layer when the large-scale structures communicate with the shock cells. This study reviews tab-controlled circular jets’ mixing and aeroacoustic behavior in subsonic and supersonic speeds. The present review aims to develop our understanding of the flow features of tabcontrolled jets due to their vast applications in the aerospace industry
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