Numerical simulation of jet mixing enhancement using rectangular control jets

Eri, Qitai; Zhang, Zhen; Zhang, Rubing; Li, Ting

doi:10.1177/0954410017727029

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…The model consists of a convergent-divergent square nozzle with and without limiting tab arrangement, enclosed by the cylindrical domain. The cylindrical domain is extended about ten times and thirty times the equivalent diameter of the nozzle exit, 42,43 respectively, along the radial and axial (along the jet centerline) directions such that the jet centerline directed along the Z-direction, which is seen from Figure 1. The three-dimensional unstructured mesh is generated with the help of ICEM module of the ANSYS workbench, and thereafter, the modeled meshed part is imported into the FLUENT solver for fluid flow analysis.…”

Section: Methodsmentioning

confidence: 99%

Numerical investigation of mixing performance for controlled supersonic jet

Kumar

Verma

Srivastava

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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In the present study, the mixing characteristics of the Mach 1.86 jet from a convergent-divergent nozzle of square cross-section from inlet to exit were investigated numerically. The jet studied were uncontrolled and controlled with limiting tab of rectangular and circular cross-sections. The nozzle pressure ratio is varied from 4 to 6 with a step size of one, leading to the confinement of the present study for the over-expansion and near correct expansion levels of the jet. It is observed that the core length, which is a direct indication of the extent of jet mixing, reduced significantly for the jet controlled with limiting tab as compared to that with the uncontrolled counterpart. Also, among the circular and rectangular limiting tabs, the tab with rectangular cross-section caused maximum core length reduction. The jet spread and the waves prevailing in the jet field were studied and visualized using pressure profiles and Mach contours, respectively. The present work may be used in understanding and solving complex phenomena occurring in the fields of aeroacoustics noise suppression, reduction of base heating of launch vehicles, supersonic combustion, mitigation of infrared radiations due to chimney smoke, etc., where jet mixing is highly desirable.

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Section: Methodsmentioning

confidence: 99%

Numerical investigation of mixing performance for controlled supersonic jet

Kumar

Verma

Srivastava

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…By adjusting the velocity and the width of jet flow, Eri et al . [10] researched their effect of the jet potential core and the penetration depth. The effects of cone angle and nozzle aspect ratio on water‐jet formation were studied by Tafreshi and Pourdeyhimi [11].…”

Section: Establishment Of Aero‐engine Online Cleaning Nozzle Modelmentioning

confidence: 99%

Research on geometrical parameters effect of fan nozzle jet performance based on orthogonal experiment

Shi

Jiang

Wei

et al. 2018

J. eng.

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“…Toshihiko Shakouchi (2019) examined the passive flow control of jets with a clear view on the boundary layers, flow control and mixing of jets. Eri et al (2017) studied the effect of rectangular control jet. The change in the PCL by variations on velocities was studied.…”

Section: Introductionmentioning

confidence: 99%

Influence of slot profiles on the characteristics of jets

Krishnaraj

Vinayagamurthy²

2022

AEAT

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Purpose The purpose of this research is to study and investigate the flow control of 0.8 Mach jet using three tab configurations. The tabs with the slots will eventually lead to generation of vortices and thus enhances the mixing characteristics. Design/methodology/approach The jet flow control is achieved by the usage of three tabs, namely, Tab A, Tab B and Tab C that are placed at the exit plane of the convergent nozzle at 180 degrees apart. Three tabs with different slot profile are designed with the same constant blockage ratio of 7.3%. The tabs produce vortices of varying sizes that directly influence and modify the jet structure, thereby enhancing the efficiency in mass entrainment and mixing. The tabs are studied numerically first and then are compared with the results of the experiments. Findings The results are compared with that of the results of the uncontrolled jet. For Mach 0.8 jet, Tab C is found to reduce the core length and gives reduction of 90.23%, in comparison to Tab A and Tab B, which provides 84.1% and 87.79%, respectively. The results of numerical are then compared with the centerline results obtained via experiments. With the engagement of Tabs A, B and C, the jet structure is seen to have been modified at Mach 0.8 with Tab C performing better. Practical implications The tabs are a passive control device that can be practically enabled in the aircraft nozzles to control the flow and even suppress the noise emanated by the jet. Tabs can be effectively used for better thrust vector control and assist in jet noise suppression. Thus, this study on tabs and its uses are important and essential in aerospace technology. Originality/value This particular study on mechanical slotted tabs is innovatively carried out by designing the tabs in such a way that one such has not been designed before. The slots run through the adjacent sides of the tabs which is a novelty in itself, whereas perforations made only through the opposite sides of the tabs are studied by various researchers till now. The slots in the adjacent faces modify the flow physics in such a way that it enhances mixing by the creation of turbulence because of the interaction between the main stream and the secondary jet exactly at the core. So far, such slots and profiles are not investigated. By the usage of such tabs, the flow to mix faster is much closer to the core of the jet by creating mixed size vortices and thus has higher efficiency.

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Numerical simulation of jet mixing enhancement using rectangular control jets

Cited by 6 publications

References 21 publications

Numerical investigation of mixing performance for controlled supersonic jet

Numerical investigation of mixing performance for controlled supersonic jet

Research on geometrical parameters effect of fan nozzle jet performance based on orthogonal experiment

Influence of slot profiles on the characteristics of jets

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