Effect of Ribs as Passive Control on Base Pressure at Sonic Mach Numbers

Khan, Aijaz Ahmed; Mazlan, Nurul Musfirah; Sulaeman, Erwin

doi:10.37934/cfdl.14.1.140151

Cited by 5 publications

(6 citation statements)

References 17 publications

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“…In contemporary times, Computational Fluid Dynamics (CFD) has found widespread utility across a multitude of applications, encompassing both internal and external flow scenarios [15][16][17][18][19][20][21]. In the context of this research, we focus our attention on the examination of three pivotal parameters: Mach number, Nozzle Pressure Ratio (NPR), and nozzle thickness.…”

Section: Cfd Analysis 21 Modelling and Meshingmentioning

confidence: 99%

“…Furthermore, the analysis encompasses parameters such as Mach number, NPR, and the Pitch Circle Diameter of control jets, culminating in the conclusion that control jets can elevate base pressure [1][2][3][4][5][6][7][8][9][10][11][12]. The Suddenly expanded flow from a converging-diverging nozzle has been studied by various authors to control base pressure by passive methods and active methods [13][14][15][16][17][18][19][20][21][22]. Nowadays the requirement of studies in the field of supersonic flows increasing by various authors [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Nozzle Design for Weight Reduction using Variable Wall Thickness

Khizar Ahmed Pathan,

Zakir Ilahi Chaudhary,

Ajaj Rashid Attar

et al. 2024

ARFMTS

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In various fields, including rockets, turbines, and engines, the critical role played by nozzles in achieving optimal performance is underscored. Within the domain of rocketry, particular attention is given to the weight of the nozzle, where even the slightest modifications in weight can lead to a profound impact on rocket performance. In this research, an endeavor is made to comprehensively investigate the intricate interplay of nozzle pressure ratio, nozzle thickness, and Mach number, to unveil the effects of these parameters on nozzle deformation, the development of equivalent stress, and the pivotal factor of safety. Material optimization strategies for a wide array of flow and geometrical parameters are also explored within the framework of this study. With each parameter considered at four levels, an exploration is conducted across Mach numbers of 1.5, 2.0, 2.5, and 3.0, alongside Nozzle Pressure Ratios of 2, 4, 6, and 8. The meticulous analysis of nozzle thicknesses at levels of 1 mm, 2 mm, 3 mm, and 4 mm is carried out. The computational fluid dynamics (CFD) analysis is systematically executed across all cases, with resultant pressure profiles on the internal surfaces of the nozzle serving as essential boundary conditions for static structural analysis. The presentation of findings entails a comprehensive discussion of the factor of safety values for all parameter combinations. Significantly, it is observed from our results that a direct correlation exists between nozzle thickness and factor of safety, with an increase in nozzle thickness corresponding to an enhancement in factor of safety.

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Section: Cfd Analysis 21 Modelling and Meshingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of Nozzle Design for Weight Reduction using Variable Wall Thickness

Khizar Ahmed Pathan,

Zakir Ilahi Chaudhary,

Ajaj Rashid Attar

et al. 2024

ARFMTS

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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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“…Notably, these methods are easier to fabricate and thus more cost-effective. Among the widely employed passive control strategies, cavities and ribs stand out prominently [13,14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Cavity on Base Pressure Manipulation in Suddenly Expanded Flow from Converging Diverging Nozzle for Area Ratio 5.29

Ridwan,

Sher Afghan Khan,

Jaffar Syed Mohamed Ali

et al. 2024

ARFMTS

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This study delves into the intricate interplay of cavity placement, Nozzle Pressure Ratio (NPR), and Mach numbers, examining their collective influence on manipulating base pressure within a duct. Employing numerical simulations, the research explores the cavity's effectiveness in altering base pressure dynamics in the duct's base area. The investigation comprehensively studies various factors, including length-to-diameter ratio, nozzle pressure ratio, Mach number, and cavity location. The simulations are conducted for a singular cavity at multiple positions concerning the duct's diameter, maintaining a fixed cavity width-to-height ratio of 1. The NPR ranges from 2 to 8, and the Mach numbers under scrutiny span from 1.2 to 1.8. The study meticulously analyses variations in base pressure and alterations in the pressure field resulting from these variables. Notably, the findings demonstrate the cavity's adeptness in controlling base pressure, particularly at NPR values of 4 and 6 for Mach numbers 1.2 and 1.4. In contrast, ineffectiveness is observed at NPR 2 and 8 due to specific flow reattachment points. However, the cavity effectively influences base pressure at NPR values of 4, 6, and 8 for Mach numbers 1.6 and 1.8. These discernments offer invaluable insights for the optimization of duct designs in diverse engineering applications.

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Effect of Ribs as Passive Control on Base Pressure at Sonic Mach Numbers

Cited by 5 publications

References 17 publications

Optimization of Nozzle Design for Weight Reduction using Variable Wall Thickness

Optimization of Nozzle Design for Weight Reduction using Variable Wall Thickness

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

Influence of Cavity on Base Pressure Manipulation in Suddenly Expanded Flow from Converging Diverging Nozzle for Area Ratio 5.29

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