Oscillatory and transient flow modes in block nozzle arrangements with a base region

Булат, П. В.; Komar, Katerina; Prodan, N. V.; Волков, К. Н.

doi:10.1016/j.actaastro.2021.11.022

Cited by 3 publications

(4 citation statements)

References 31 publications

(31 reference statements)

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“…The most important usages of the oscillatory phenomenon are the oscillating disk in pulse combustor and reciprocating engine. Some recent developments in oscillatory flow can be seen in various studies 19–22 . Munawar et al 23 investigated the time‐dependent viscous fluid flow induced through an oscillatory stretching disk.…”

Section: Introductionmentioning

confidence: 99%

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Time‐dependent double phase dusty fluid flow over an oscillatory rotating disk

Alahmadi,

Rauf,

Mushtaq

et al. 2024

Heat Trans

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The dispersion of solid particles in a viscous fluid leads to a two‐phase flow nature. The present study incorporates the time‐dependent three‐dimensional dusty fluid flow generated by a periodically oscillatory rotating disk. The disk is stretchable along the radial axis with time‐based sinusoidal fluctuations. The governing incompressible flow equations for two‐phase equilibrium are normalized in the form of similarity systems consisting of the fluid stage and dust phase. The whole normalized system reduces to the familiar Von Kármán similarity system for the flow configuration of rotating disk by removing the dust phase and periodic oscillations of the disk. The two‐phase flow model is then numerically solved by a built‐in method namely “pdsolve” in Maple built program. The graphical aspects of the obtained physical parameters on velocity and thermal fields of the dust particle stage are investigated to show how the oscillatory disk contributes to the dusty flow features. The wall shears and thermal rates of the fluid and dust particles are also calculated in limiting case of disk rotation. It is observed that in time‐based flow, the oscillatory profiles preserve a phase shifting phenomenon. For centrifugal forces, the particle cloud moves away from the surface along a tangential direction. The thermal field is reduced by the dust particle stages.

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Section: Introductionmentioning

confidence: 99%

“…Some recent developments in oscillatory flow can be seen in various studies. [19][20][21][22] Munawar et al 23 investigated the time-dependent viscous fluid flow induced through an oscillatory stretching disk. The unsteadiness of the fluid flow reveals that initially shear force is very small and enhanced for long time.…”

mentioning

confidence: 99%

Time‐dependent double phase dusty fluid flow over an oscillatory rotating disk

Alahmadi,

Rauf,

Mushtaq

et al. 2024

Heat Trans

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“…The treatment of transient oscillatory choked flow through a nozzle in the literature focuses primarily on rocket propulsion nozzle improvements. 6,7 Literature focuses on low frequencies, while this research will address the gap for transient behavior of high-frequency oscillatory flow. This investigation focuses on determining and controlling oscillatory air flow properties through area variation and examination of a selected fluid's contribution to the choked flow equation.…”

Section: Introductionmentioning

confidence: 99%

“…6 The study by Bulat also focuses on a self-oscillating process in low-frequency ranges. 7 Speakers are a non-contact method of actuation and researchers applied them as a method of active control for avoiding flutter in fan blades, but the focus here is on a valve application that modulates mass flow. 4 Piezoelectric stack actuators allow for an increased displacement of the material and are available in a range of cross-section shapes.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric ring-stack actuator design for high-frequency valve

Giannuzzi

Rodriguez

Pietrowski

et al. 2023

Active and Passive Smart Structures and Integrated Systems XVII

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This paper presents a fundamental non-contact valve design developed by integrating a ring-stack piezoelectric actuator into a converging nozzle design to impart harmonic flow. The paper also outlines the governing equations as well as limiting factors that constrain the design and operating performance. The converging nozzle design achieves choked flow at the valve exit when the nozzle is fully open. Valve actuation centers around piezoelectric ring stacks: the piezoelectric stack is fixed within the valve on one end to the base plate and has a conical nozzle tip attached to the opposite end of the stack. When the stack fully displaces to its maximum length, the nozzle tip is in the closed position where minimal flow passes through the valve exit. The flow area between the nozzle tip and casing wall achieves maximum mass flow rate when the piezoelectric stack is at minimum length. The change in flow cross-sectional area due to the piezoelectric stack displacement generates a change in mass flow rate through the valve. Due to the small-scale displacement of piezoelectric stacks, different angles of the nozzle cone and casing are required to achieve a greater desired mass flow rate. This model is adjustable to accommodate various piezoelectric stack sizes and displacements or to alter the exit mass flow rate to best suit a particular application.

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