Numerical simulation and PIV study of compressible vortex ring evolution

Thangadurai, Murugan; De, S. K.; Dora, C. L.; Das, Debopam

doi:10.1007/s00193-011-0344-9

Cited by 42 publications

(24 citation statements)

References 36 publications

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“…Synthetic jet can transport the momentum, energy, and vorticity similar to the vortex ring 21 as it consists of a train of vortex rings. The ability to change the frequency, amplitude, size and the shape makes the SJ as an ideal choice for a diverse range of applications.…”

Section: Applications Of Synthetic Jetmentioning

confidence: 99%

Recent Developments on Synthetic Jets (Review Paper)

et al. 2016

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<p>Synthetic jet is a form of pulsatile jet where the flow is synthesised from the ambient air and it does not need any external source as the flow is induced from the fluid existing around orifice/nozzle. This property makes synthetic jet unique compared to pulsatile and continuous jets. Recently, the synthetic jet is being widely used for flow control, mixing and heat transfer enhancement in aerospace applications. Focused on reviewing the recent developments on synthetic jet characterization and their applications resulting from the development of advanced diagnosing tools.</p>

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Section: Applications Of Synthetic Jetmentioning

confidence: 99%

Recent Developments on Synthetic Jets (Review Paper)

et al. 2016

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“…Обзор по численному моделированию вихревого кольца приведен в работах [25,26]. Большинство работ, касающихся численного моделирования нестационарных процессов, протекающих в вихревом кольце, связано с более или менее точным моделированием различных типов неустойчивости безотносительно к излучаемому кольцом звуковому полю [27,28], так как моделируется главным образом крупномасштабная динамика кольца. В работах другого типа решаются задачи об образовании кольца или взаимодействии его с преградами [29], т.е.…”

Section: объект исследованияunclassified

Experimental Investigation of Turbulent Vortex Ring Noise in Anechoic Chamber

Kopiev¹,

Zaytsev²,

Palchikovskiy³

et al. 2016

PNRPU Aerospace Engineering Bulletin

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1 Центральный аэрогидродинамический институт им. профессора Н.Е. Жуковского, Москва, Россия 2 Пермский национальный исследовательский политехнический университет, Пермь, Россия ЭКСПЕРИМЕНТАЛЬНОЕ ИССЛЕДОВАНИЕ ШУМА ТУРБУЛЕНТНЫХ ВИХРЕВЫХ КОЛЕЦ В ЗАГЛУШЕННОЙ КАМЕРЕПриводятся первые результаты по экспериментальной диагностике аэроакустических свойств фундаментального объекта механики жидкости и газатурбулентного вихревого кольца, которые были получены с помощью современных методов многоканальных акустических измерений и постпроцессинга.Шум вихревого кольца удается различить на фоне помех только в специальных акустически заглушенных камерах. В данной работе регистрация шума свободно летящего вихревого турбулентного кольца проводилась в заглушенной камере размерами 10×6,7×4,1 м, недавно построенной и введенной в эксплуатацию в лаборатории механизмов генерации шума и модального анализа Пермского национального исследовательского политехнического университета. В результате проведенных экспериментов удалось выделить шум кольца и получить усредненные по ансамблю реализаций узкополосные спектры звукового давления, что говорит о хорошем акустическом качестве разработанного и изготовленного генератора вихрей и введенной в эксплуатацию в ПНИПУ акустической заглушенной камеры в целом. Эти эксперименты, в свою очередь, дают возможность проведения на их основе тонких аэроакустических исследований.Ключевые слова: турбулентное вихревое кольцо, аэроакустика, заглушенная камера, поршневой генератор вихрей.

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“…These techniques capture the density or instantaneous velocities of the flow fields and are primarily used to understand and characterize the nature of exit jets, vortex rings. Increasingly, these optical techniques are coupled with numerical simulations to better describe the observable flow phenomena, enabling additional quantifiable analysis of the flow field [18]. However, despite the wealth of work performed in this field, a majority of the work conducted is conducted in shock tubes which are much smaller [11,14,19,20] or much larger [21] than those conventionally used in biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

The evolution of secondary flow phenomena and their effect on primary shock conditions in shock tubes: Experimentation and numerical model

et al. 2020

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Compressed gas-driven shock tubes are widely used for laboratory simulation of primary blasts by accurately replicating pressure profiles measured in live-fire explosions. These investigations require sound characterization of the primary blast wave, including the temporal and spatial evolution of the static and dynamic components of the blast wave. The goal of this work is to characterize the propagation of shock waves in and around the exit of a shock tube via analysis of the primary shock flow, including shock wave propagation and decay of the shock front, and secondary flow phenomena. To this end, a nine-inch shock tube and a cylindrical sensing apparatus were used to determine incident and total pressures outside of the shock tube, highlighting the presence of additional flow phenomena. Blast overpressure, impulse, shock wave arrival times, positive phase duration, and shock wave planarity were examined using a finite element model of the system. The shock wave remained planar inside of the shock tube and lost its planarity upon exiting. The peak overpressure and pressure impulse decayed rapidly upon exit from the shock tube, reducing by 92-95%. The primary flow phenomenon, or the planar shock front, is observed within the shock tube, while two distinct flow phenomena are a result of the shock wave exiting the confines of the shock tube. A vortex ring is formed as the shock wave exited the shock tube into the still, ambient air, which induces a large increase in the total pressure impulse. Additionally, a rarefaction wave was formed following shock front expansion, which traveled upstream into the shock tube, reducing the total and incident pressure impulses for approximately half of the simulated region. OPEN ACCESS Citation: Kahali S, Townsend M, Mendez Nguyen M, Kim J, Alay E, Skotak M, et al. (2020) The evolution of secondary flow phenomena and their effect on primary shock conditions in shock tubes: Experimentation and numerical model. PLoS ONE 15(1): e0227125. https://doi.org/10.

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Numerical simulation and PIV study of compressible vortex ring evolution

Cited by 42 publications

References 36 publications

Recent Developments on Synthetic Jets (Review Paper)

Recent Developments on Synthetic Jets (Review Paper)

Experimental Investigation of Turbulent Vortex Ring Noise in Anechoic Chamber

The evolution of secondary flow phenomena and their effect on primary shock conditions in shock tubes: Experimentation and numerical model

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