Studies on Shock Tube Generated Compressible Vortex Rings PDF Download
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Author: Murugan Thangadurai
Publisher: LAP Lambert Academic Publishing
ISBN: 9783846549032
Category :
Languages : en
Pages : 164
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Book Description
Flow field and acoustic characteristics of compressible vortex ring evolution and its interaction with wall have been investigated for Mach number varying from 1.3 to 1.85 using high speed smoke visualizations and microphone. Importance of vortex ring study, classifications, generation mechanism, parameters that characterize its evolution and time line of vortex rings research since its discovery are discussed in Chap. 1. Shock tube design and theory of shock tube flow with the history and applications of shock tube are discussed in Chap. 2 and appendix A. The spatial and angular variations of incident shock diffracted at the shock tube exit are also studied using hot wire anemometer. The effect of driver section length, its pressure, and various driver section gases on shock strength and uniform flow time is discussed using method of characteristics (MOC) technique. Evolution of primary and counter rotating vortex rings (CRVR) are studied in chap. 3 and 4. Vortex ring diameter increases rapidly and translational velocity decreases during the formation and evolution of CRVR. The shock and wall interaction of vortex ring are discussed in Chap. 5.
Author: Murugan Thangadurai
Publisher: LAP Lambert Academic Publishing
ISBN: 9783846549032
Category :
Languages : en
Pages : 164
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Book Description
Flow field and acoustic characteristics of compressible vortex ring evolution and its interaction with wall have been investigated for Mach number varying from 1.3 to 1.85 using high speed smoke visualizations and microphone. Importance of vortex ring study, classifications, generation mechanism, parameters that characterize its evolution and time line of vortex rings research since its discovery are discussed in Chap. 1. Shock tube design and theory of shock tube flow with the history and applications of shock tube are discussed in Chap. 2 and appendix A. The spatial and angular variations of incident shock diffracted at the shock tube exit are also studied using hot wire anemometer. The effect of driver section length, its pressure, and various driver section gases on shock strength and uniform flow time is discussed using method of characteristics (MOC) technique. Evolution of primary and counter rotating vortex rings (CRVR) are studied in chap. 3 and 4. Vortex ring diameter increases rapidly and translational velocity decreases during the formation and evolution of CRVR. The shock and wall interaction of vortex ring are discussed in Chap. 5.
Author: Jacques Haertig
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Book Description
Author: Alexander Michael Ames
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The initial development and shock acceleration of inhomogeneous compressible vortex rings is experimentally investigated in a vertical shock tube. Vortex rings are created by discharging gas (either N2, Ar, CF4, or SF6) into ambient N2 from the open end of a small, upwards-firing shock tube mounted in the end wall of a large, downwards-firing shock tube. Separation between the two gases is maintained by continuously evacuating excess gas from a slot encircling the open end of the small shock tube. The initial development of the vortex rings across a broad range of ring formation parameters is investigated using high-speed planar laser-induced fluorescence (PLIF) and particle image velocimetry (PIV). Ring formation conditions are controlled by varying the driver pressure ratio p4/p1, producing rings with circulation-based Reynolds numbers between 1×105 and 3×106. The early-time growth of the rings is found to be strongly dependent on the Reynolds number and weakly dependent on the Atwood number. A subset of the ring formation parameters is selected for further investigation following shock acceleration by a M = 2.05 planar shock wave. Ring trajectories and the evolution of geometric parameters are compared to their pre-shock states. Ring circulation is found to increase significantly for the high-Atwood cases due to baroclinic deposition of vorticity, but is found to counterintuitively decrease for the low-Atwood cases. Vorticity deposition due to shock curvature effects around vortex cores is directly observed experimentally for the first time.
Author: Raffaello Mariani
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Experimental studies have been conducted on the topic of the interaction of compressiblevortex rings on stationary surfaces. Throughout the campaign experimentswere carried out at pressure ratios of ! 4, 8, and 12. In the classical set up of airas both the driver and driven gas, these corresponded to theoretical incident Machnumbers Ms of 1.34, 1.54, and 1.61.Experiments were conducted on vortex rings impinging on a stationary surfacelocated at three (increasing) distances (1.66, 3.33, and 5.00 inner diameters) fromthe shock tube exit and on a stationary surface at a set distance but at three anglesinclinations (75, 60, and 45deg at 3.33 inner diameters). Results of the impingementof a vortex ring on a stationary solid surface perpendicular to the flow showed asymmetrical impingement process. A boundary layer is generated over the surfacewith an associated increase in pressure. An increase in velocity due to the radialexpansion causes the pressure over the surface to decrease. This expansion leads tothe development of azimuthal wave instabilities along the core. Pressure was seen toincrease with an increase in incident Mach number value. The variation in distanceresulted in an increase in pressure with an increase in distance. This counter-intuitiveresult can be explained by the higher translational velocity at impingement, alongwith the absence of the initial radial expansion of the counter-rotating vortex rings. The variation in surface angle inclination introduced several degrees of asymmetry. One core of the vortex ring impinges first on the surface due to its closerproximity to it, while the other core is still free to propagate. This process generatesan asymmetric boundary layer over the surface, and a higher rate of stretching ofthe lower core, resulting in its dissipation. At higher incident Mach numbers, theembedded rearward facing shock is reflected and propagates perpendicularly to thesurface. At the inclination angles of 60 and 45deg, the counter-rotating vortex ringsare fully deflected upwards and orbit around the main vortex. This phenomenonresult in a significant difference in pressure distribution between the upper and lowersections of the surface.
Author: Michael Alexander Hollingsworth
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Suvanjan Bhattacharyya
Publisher: Springer Nature
ISBN: 9811962707
Category : Science
Languages : en
Pages : 628
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Book Description
This book presents the select proceedings of the 48th National Conference on Fluid Mechanics and Fluid Power (FMFP 2021) held at BITS Pilani in December 2021. It covers the topics such as fluid mechanics, measurement techniques in fluid flows, computational fluid dynamics, instability, transition and turbulence, fluid‐structure interaction, multiphase flows, micro- and nanoscale transport, bio-fluid mechanics, aerodynamics, turbomachinery, propulsion and power. The book will be useful for researchers and professionals interested in the broad field of mechanics.
Author: Shriram Hegde
Publisher: Springer Nature
ISBN: 9811941408
Category : Technology & Engineering
Languages : en
Pages : 288
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Book Description
The book presents select proceedings of the International Conference on Mechanical Engineering (INCOME 2021). It includes the topics related to design and functional requirements of components used in mechanical systems. The contents covered include concept design, detailed design, structural design, mechanics, static and dynamic systems. The book also discusses various methods of software aided design and analysis. Given the contents, the book will be a valuable reference for beginners, researchers, and professionals working in various domains of mechanical engineering.
Author: Raymond Brun
Publisher: Springer Science & Business Media
ISBN: 3642795323
Category : Science
Languages : en
Pages : 508
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Book Description
Recently, there have been significant advances in the fields of high-enthalpy hypersonic flows, high-temperature gas physics, and chemistry shock propagation in various media, industrial and medical applications of shock waves, and shock-tube technology. This series contains all the papers and lectures of the 19th International Symposium on Shock Waves held in Marseille in 1993. They are published in four topical volumes, each containing papers on related topics, and preceded by an overview written by a leading international expert. The volumes may be purchased independently.
Author: D. G. Akhmetov
Publisher: Springer Science & Business Media
ISBN: 3642050166
Category : Technology & Engineering
Languages : en
Pages : 154
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Book Description
Vortex flow is one of the fundamental types of fluid and gas motion. These flows are the most spectacular in the form of concentrated vortices, characterized by the localization of vorticity (curl of velocity) in bounded regions of a space, beyond which the vorticity is either absent or rapidly falls down to zero. Concentrated vortices are often observed in nature, exemplified by atmospheric cyclones, whirlwinds and tornados, oceanic vortices, whirlpools on a water s- face, and ring vortices caused by explosive outburst of volcanoes. In technical - vices concentrated vortices form when flow separates from sharp edges of flying vehicles and ships. Among these are vortices flowing off the ends of airplane wings, and intentionally generated vortices for intensification of burning in c- bustion chambers, vortices in cyclonic devices used for mixing or separation of impurities in fluids and gases. One such remarkable and frequent type of conc- trated vortices is a vortex ring which constitutes a vortex tube closed into a t- oidal ring moving in a surrounding fluid like an isolated body out of contact with solid boundaries of the flow region if such boundaries exist. Formation and motion of vortex rings are important part of the dynamics of a continuum medium and have been studied for more than a century.
Author: James F. Roach
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 48
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Book Description
