Control of CD Nozzle Flow using Microjets at Mach 2.1

doi:10.35940/ijitee.i1128.0789s219

Cited by 11 publications

(6 citation statements)

References 3 publications

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“…Internal flow experiments have several advantages over exterior flow experiments: they use less air, eliminate support devices, and allow for easy measurement of the base pressure in the base region [5,6]. The primary benefit of an internal flow apparatus is that it enables absolute static pressure and surface temperature measurements not only during the expansion's entrance section but also in the wake zone [7,8]. Suddenly expanded flow is characterized by separation, recirculation, and reattachment.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of Expansion Level and Relief to Shear Layer in a Suddenly Expanded Flow: A CFD Approach

Ridwan

Rosnin²,

Aabid³

et al. 2022

ARFMTS

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Computational Fluid Dynamics analysis was used to study the effect of expansion level in a suddenly expanded flow for a converging-diverging nozzle expanded to the duct of larger diameter at supersonic Mach number. Parameters include the nozzle pressure ratio (NPR), L/D ratio, and area ratio. The model of the converging-diverging (C-D) nozzle suddenly expanding into the enlarged duct with the cavity was created using the Design Modeler of ANSYS Fluent. The Mach number of the study is 1.6. The area ratio varied from 2.25 to 5.29, and the L/D ranged from 1 to 10. The simulated nozzle pressure ratio (NPR) ranged from 2, 3, 4.25, and 6.375. The outcome demonstrated that the geometric alteration and NPR strongly affect the base pressure. The ambient pressure influences result in lower L/Ds. The cavity of aspect ratio 1 is most effective in raising the base pressure. Increasing the width does not yield any desirable results. However, the location of the cavity played a very significant role in base pressure regulation. The duct's wall pressure and the flow field remained identical with and without control.

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Section: Literature Reviewmentioning

confidence: 99%

Effect of Expansion Level and Relief to Shear Layer in a Suddenly Expanded Flow: A CFD Approach

Ridwan

Rosnin²,

Aabid³

et al. 2022

ARFMTS

View full text Add to dashboard Cite

show abstract

“…Hence, recent findings have also shown that several studies are conducted with equivalent or variable Mach number and area ratios with the same NPR and L/D ratios. The majority of wall pressure flows were considered with varying the area ratio, such as 2.56 [ [103][104][105]110], and varying the Mach number for the same area ratio 2.56 with Mach 2 and 3 [106], 1.3. 1.9, and 2.4 [111] and for the area ratio 6.25 with Mach 1.1 and 1.5 [112] and 2.1 and 2.8 [113].…”

Section: Experimental Investigationmentioning

confidence: 99%

A Critical Review of Supersonic Flow Control for High-Speed Applications

2021

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In high-speed fluid dynamics, base pressure controls find many engineering applications, such as in the automobile and defense industries. Several studies have been reported on flow control with sudden expansion duct. Passive control was found to be more beneficial in the last four decades and is used in devices such as cavities, ribs, aerospikes, etc., but these need additional control mechanics and objects to control the flow. Therefore, in the last two decades, the active control method has been used via a microjet controller at the base region of the suddenly expanded duct of the convergent–divergent (CD) nozzle to control the flow, which was found to be a cost-efficient and energy-saving method. Hence, in this paper, a systemic literature review is conducted to investigate the research gap by reviewing the exhaustive work on the active control of high-speed aerodynamic flows from the nozzle as the major focus. Additionally, a basic idea about the nozzle and its configuration is discussed, and the passive control method for the control of flow, jet and noise are represented in order to investigate the existing contributions in supersonic speed applications. A critical review of the last two decades considering the challenges and limitations in this field is expressed. As a contribution, some major and minor gaps are introduced, and we plot the research trends in this field. As a result, this review can serve as guidance and an opportunity for scholars who want to use an active control approach via microjets for supersonic flow problems.

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“…Muhammed et al, [14] focussed on the flow field around a non-circular cylinder and conclude that the pressure drag coefficient is in the range of 1 to 1.42. The convergent-divergent nozzle was studied for different area ratios by Khan et al, and Akhtar et al, [15][16][17][18]. It was found that the area ratio plays a vital role in base pressure distribution.…”

Section: Literature Overviewmentioning

confidence: 99%

Numerical Investigation of Mathematical Non-Dimensional Constant Representing Smoothness in the Nusselt Profile

Ansari¹,

Khan²,

Akhtar³

et al. 2020

CFDL

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Cooling of devices using air-jet and other fluid impingement has acquired pace in the manufacturing and electronic device industries. The cooling of the surface using liquid jets is studied using the Nusselt distribution profile. The pattern of the Nusselt profile becomes non-uniform when some parameters are wrongly selected. This may lead to heating of some locations instead of cooling of the surface. Thus research for keeping the Nusselt profile uniform is a primary task. The Nusselt profile depends mainly on the Reynolds number (Re) and nozzle-target spacing (Z/d). Therefore, the current study numerically evaluates the value of constant, which is a ratio of Reynolds number and nozzle-target spacing (C = Re/ (Z/d)) up to which the Nusselt profile remains uniform. The value of constant C is found to be 7400. Also, the present work uses a computational model for study, which is validated using grid independence test and turbulence modeling.

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Control of CD Nozzle Flow using Microjets at Mach 2.1

Cited by 11 publications

References 3 publications

Effect of Expansion Level and Relief to Shear Layer in a Suddenly Expanded Flow: A CFD Approach

Effect of Expansion Level and Relief to Shear Layer in a Suddenly Expanded Flow: A CFD Approach

A Critical Review of Supersonic Flow Control for High-Speed Applications

Numerical Investigation of Mathematical Non-Dimensional Constant Representing Smoothness in the Nusselt Profile

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