2024 Precessing vortex core

Precessing vortex core

Author: aynf

August undefined, 2024

WebFeb 5, 2024 · Arndt, M. Stöhr, M. J. Severin, C. Dem, and W. Meier, “ Influence of air staging on the dynamics of a precessing vortex core in a dual swirl gas turbine model combustor,” in 53rd AIAA/SAE/ASEE Joint Propulsion Conference (AIAA, 2024), p. 4683. Google Scholar Crossref; 37. P. S. WebOct 1, 2012 · The precessing vortex core (PVC) is a well-known coherent structure whose development, intensity and occurrence has not been well documented. This paper thus …

Suppression of vortex core precession in a swirling reacting flow

WebApr 12, 2024 · Fig. 4. (Color online) System of two transverse vortices at { {\kappa }^ {2}} = 2. The positive and negative vortices are oriented along the y axis and their cores differ in the amount of the trapped second component. The longitudinal section of the beam by the x = 0 plane at ζ = (a) 291 and (b) 300. Full size image. WebJan 13, 2024 · This flow is characterized by phenomena such as vortex transition, precessing vortex core, toroidal recirculation zone, reverse flow core and recirculation zone in the axial… Show more knott county pva maps

Helical vortex core dynamics and flame interaction in turbulent ...

WebSep 1, 2024 · If the swirl is increased to Sw = 0.47, this breakdown bubble is permanently present in the flow field. A large-scale vortical structure, the precessing vortex core, … WebThe precessing vortex core (PVC) is a coherent structure that can arise in swirling jets from a global instability. In this work, the PVC is investigated under highly turbulent conditions. … WebDec 31, 2006 · It is known that precessing vortex core (PVC) formation is related to unsteady CRZ motion. 1, 56 Moreover, in unidirectional swirling flows, the CRZ moves coherently with PVC and rotates with the ... red glow in atlantic ocean

Special Issue "Fluid Mechanics in Hydraulic Turbines"

WebOct 26, 2024 · Such large-scale vortices can be induced by the helical coherent structure known as precessing vortex core (PVC), which influences the flow and flame dynamics … WebJan 12, 2024 · The fast Fourier transform of the sampled velocity and pressure signals indicates a precessing vortex core with a frequency of 22 Hz. This frequency is in line with the one detected by spectral proper orthogonal decomposition, which is utilized to identify the coherent structures in the near-field region of the swirling flow in the present work. red glow eyesWebThis paper will present new information on the occurrence and suppression of the precessing vortex core and its influence on the combustion process and, in particular, the stimulation of acoustic instability in closed systems. A swirl burner which has been extensively characterised over many years is operated in a premixed/partially-premixed … knott county pva kentucky

"WebJun 16, 2016 · The influence of combustion effect on unsteady vortex structure in the form of precessing vortex core was studied using the non-intrusive method of laser Doppler anemometry and special procedure of extracting the non-axisymmetric mode of flow fluctuations. The studies show that combustion has a significant effect on the … " - Precessing vortex core

Precessing vortex core

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WebOct 31, 2024 · The precessing vortex core (PVC) represents a helical-shaped coherent flow structure typically occurring in both reacting and nonreacting swirling flows. Until now, the … WebNov 30, 2024 · Download PDF Abstract: Global instabilities in swirling flows can significantly alter the flame and flow dynamics of swirl-stabilized flames, such as those in modern power generation gas turbine engines. In this study, we characterize the interaction between the precessing vortex core (PVC), which is the consequence of a global hydrodynamic …

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WebOne of these structures is the Precessing Vortex Core (PVC), whose ambiguous characteristics make it an adequate mechanism for chemical mixing whilst being a detrimental component for thermoacoustic stabilisation. The PVC has been extensively characterised in swirling jet flows exhibiting vortex breakdown (in this study named Open …

WebDec 16, 2024 · Wu et al. studied the effect of outlet geometry contraction on the precessing vortex core (PVC) and the vortex breakdown structure in a combustor. Stöhr et al. [ 19 ] elucidated the coupling of a helical PVC in a combustion chamber and flame development in a turbulent flow field. WebOct 17, 2024 · In this experimental study, a passive flow control concept is provided to extend the stable part load operation regime by shifting the rise of the precessing vortex core (PVC), also known as ...

WebJan 17, 2024 · Previous work suggested that the existence of a precessing vortex core (PVC) may suppress the receptivity of the shear layer, and the goal of this study is to first, … WebThe precessing vortex core (PVC) is a well-known coherent structure whose development, intensity and occurrence has not been well documented. This paper thus adopts an experimental approach to characterize the PVC in a …

WebIn this study, we characterize the interaction between the precessing vortex core (PVC), which is the consequence of a global hydrodynamic instability, and thermoacoustic …

WebJul 4, 2024 · Moreover, the control allows the precessing vortex core to be excited in conditions where it is naturally suppressed by the flame, which yields a very effective possibility to control the precessing vortex core amplitude. The control is then applied to thermoacoustically unstable conditions. knott county pva officeWebJul 1, 2024 · The simulations successfully capture the quasi-periodic precessing vortex core (PVC) phenomenon. The spectra derived from the temporal signals of different flow … knott county real estateWebJun 16, 2016 · The influence of combustion effect on unsteady vortex structure in the form of precessing vortex core was studied using the non-intrusive method of laser Doppler … red glow in the dark eye contactsWebWe report on the experimental study of a precessing vortex core (PVC) in an air model of a Francis turbine. The focus is placed on the modal decomposition of the PVC that occurs in the draft tube of the model turbine for a range of operation conditions. The turbulent flow fluctuations in the draft tube are assessed using stereo particle image velocimetry (PIV) … red glow in the dark inkWebJul 7, 2024 · American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 20241-5807 703.264.7500 knott county schools emailWebApr 1, 2016 · The precessing vortex core (PVC) is a coherent flow structure that is often encountered in swirling flows in gas turbine (GT) combustors. In some swirl combustors, ... red glow for horsesWebWe study the emergence of precessing vortex core (PVC) oscillations in a swirling jet experiment. We vary the swirl intensity while keeping the net mass flow rate fixed using a … knott county rehabilitation center