Combustion in a Cross Flow with Air Jet Nozzles

Kamal, Mahmoud

doi:10.1080/00102200802381429

Cited by 5 publications

(4 citation statements)

References 26 publications

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“…A radial swirler with crossflow was considered recently, but its geometry is sufficiently different from the LP jet in crossflow that it will not be considered here [Kamal, 2009]; the LP jets swirl azimuthally as they travel in the z-direction.…”

Section: Swirling Jet In Crossflowmentioning

confidence: 99%

“…Consequently, Figure 151C shows that the two jets were unable to reach the lower plate. This is a basic effect of conventional jets in crossflow [Pratte and Baines, 1967;Nirmolo, 1970;Chassaing, P. et al, 1974;Kamotani and Greber, 1974;Sucec and Bowley, 1976;Patankar, Basu, and Alpay, 1977;Goldstein and Behbahani, 1982;Kavsaoglu and Schetz, 1989;Blevins, 1992;Rivero, Ferre, and Giralt, 2001;Kiel et al, 2003;Kawai and Lele, 2007] and swirling jets in crossflow [Kavsaoglu and Schetz, 1989;Denev, Frohlich, and Bockhorn, 2009;Kamal, 2009]: the higher the ratio of crossflow velocity to jet velocity, the faster the jet will bend in a parabolic profile. Figure 151D shows the fluid temperature as seen from the bottom.…”

Section: Multiphysics Advanced Swirling-jet Lp Modelingmentioning

confidence: 99%

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Swirling jets for the mitigation of hot spots and thermal stratification in the VHTR lower plenum.

Rodríguez¹

2011

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The literature indicates that a prismatic-core very high temperature reactor can experience thermal stratification and hot spot issues in the lower plenum (LP). This research hypothesizes that the complex thermalhydraulic phenomena in the LP requires a sophisticated computational fluid dynamics (CFD) code with state-of-the-art turbulence models and advanced swirling jet technology to mitigate the two issues. The primary research goals were to increase the heat transfer and mixing capacity of swirling jets, extend swirling jet theory, and to apply those advancements for the mitigation of the thermalhydraulic issues. First, it was demonstrated that the Fuego CFD code successfully modeled a set of key LP thermalhydraulic phenomena. Thereafter, a helicoid vortex swirl model was developed to investigate the impact of the swirl number (S) on mixing and heat transfer. The development of azimuthal and axial velocities that are solely functions of S permitted the analysis of the central recirculation zone's (CRZ) impact on the LP flow field. At this point, several characteristics were found in common between the helicoid vortex and other axisymmetric, Newtonian, incompressible vortices found in the literature. This observation resulted in a more fundamental understanding of how vortices behave, and which traits can be exploited for the purpose of maximizing heat transfer and mixing. Because the CRZ is a strong function of the azimuthal and axial velocities, shaping those velocity profiles had a substantial impact. Eventually, this led to the discovery that vortices may be expressed as alternating series that expand geometrically with odd exponents. This helped corroborate that the 15 axisymmetric vortices discussed in this research are part of a vortex family with seven common traits. This also led to the development of new vortices that are based on one or two series terms that satisfy the Navier-Stokes equations and conservation of mass. In addition, the impact of Reynolds number and swirl decay were explored in order to further quantify their impact. Finally, the above theories and modeling insights were applied towards a comprehensive set of LP calculations that showed that the swirling jets mitigated the entrainment and hot spot issues, while resulting in a reasonable pressure drop. Contents

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Section: Swirling Jet In Crossflowmentioning

confidence: 99%

Section: Multiphysics Advanced Swirling-jet Lp Modelingmentioning

confidence: 99%

Swirling jets for the mitigation of hot spots and thermal stratification in the VHTR lower plenum.

Rodríguez¹

2011

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“…Consequently, Figure 19C shows that these two jets are unable to reach the lower plate. This is a basic effect of conventional jets in crossflow (Blevins, 1992;Chassaing et al, 1974;Goldstein and Behbahani, 1982;Kamotani and Greber, 1974;Kavsaoglu and Schetz, 1989;Kawai and Lele, 2007;Kiel et al, 2003;Patankar, Basu, and Alpay, 1977;Rivero, Ferre, and Giralt, 2001;Sucec and Bowley, 1976;Nirmolo, 1970;Pratte and Baines, 1967), and swirling jets in crossflow (Denev, Frohlich, and Bockhorn, 2009;Kamal, 2009;Kavsaoglu and Schetz, 1989): the higher the ratio of crossflow velocity to the jet velocity, the faster the jet will bend in a parabolic profile.…”

Section: Multiphysics Advanced Swirling-jet Lp Modelingmentioning

confidence: 99%

Two Phase Flow, Phase Change and Numerical Modeling

Ahsan¹

2011

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Malaysia, Malaysia. He received a Ph.D in Civil Engineering from the University of Fukui, Japan. He has been involved in collaboration research with many researchers and scientists in the world since 2004 and published in diverse areas of Civil and Environmental Engineering. He has published 3 books, 6 book chapters, over 19 technical papers, and is a member of the editorial board of numerous international technical journals. He has been serving on the scientific and editorial board of InTech Open Access Publisher since 2010.

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