Filtered Rayleigh Scattering-Based Concentration Measurements for a Horizontal Buoyant Jet

McGaha, Christopher; Reeder, Mark F.

doi:10.1109/iciasf.2007.4380890

Cited by 2 publications

(4 citation statements)

References 13 publications

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“…In fact, we found that both the transversal velocities u and v have the same scale d 1=2 W 0 in the core region, applying Eq. (12) to the case shown in Figure 8, we get d 1=2 $ 0.05 that is of the order of magnitude of what is shown if the figure. This give the experimental evidence that the flow is not axi-symmetric at the nozzle exit and the set up of high fidelity simulations of a horizontal buoyant jet cannot ignore the flow recirculations upstream the release section.…”

Section: Resultssupporting

confidence: 50%

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Early development of the veil-shaped secondary flow in horizontal buoyant jets

et al. 2011

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Under specific conditions, a secondary flow can develop from a laminar horizontal buoyant jet released through a round nozzle. This secondary flow is a veil-shaped plane plume, which detaches from the main jet. The conditions for its apparition have been empirically determined and are available in the open literature. This paper aims to give theoretical basis to these conditions and to show some novel experimental observations and measurements on horizontal buoyant jets with secondary plume. One of the main results is the identification of the persistence of transversal velocity components in the release section of horizontal buoyant jets.

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Section: Resultssupporting

confidence: 50%

“…This core deformation has already been observed by McGaha and Reeder. 12 In jets in a crossflow, the shear of the ambient wind on the body of the jets causes a similar deformation of the flow. 13 Due to the initially thin boundary layer around uniform potential core, well-defined vortical structures are observed close to the nozzle.…”

Section: Resultsmentioning

confidence: 99%

Early development of the veil-shaped secondary flow in horizontal buoyant jets

et al. 2011

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“…By far the most common filter/laser pairing is a molecular iodine filter and an Nd:YAG laser (532 nm). Iodine can also be used as the absorbing species for a CW argon-ion laser (514.5 nm) illumination source, as was demonstrated by Komine et al in their initial Doppler global velocimetry (DGV) measurements [72], and utilized for FRS by Reeder et al [73,74]. As mentioned previously, the intensity of Rayleigh scattered light scales with 1/λ 4 , so the strength of the Rayleigh scattered signal greatly increases when using a UV illumination source [8].…”

Section: Absorption Filtermentioning

confidence: 94%

“…This is generally accomplished when the variation in a calibrated and normalized FRS signal is a function only of the local mixture composition. Reeder et al [73,74] designed such an experiment and used FRS to quantify the core jet trajectory and mixing rate of buoyant helium and carbon dioxide jets issuing into air using a CW laser. They identified jet features that influence the gross mixing rate, such as side jets that expel fluid from the core.…”

Section: Mixture Compositionmentioning

confidence: 99%

Quantitative gas property measurements by filtered Rayleigh scattering: a review

Ground¹,

Hunt²,

Hunt³

2023

Meas. Sci. Technol.

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Filtered Rayleigh scattering (FRS) is a laser-based diagnostic technique used to nonintrusively quantify various thermodynamic properties of a light-scattering gas. The backbone of FRS is the molecular filtering of Rayleigh scattered light. This concept was initially introduced by the atmospheric LIDAR community before being adopted within the aerospace research field in the early 1990s. Since then, FRS has matured into a versatile quantitative diagnostic tool and has found use in a variety of flow regimes ranging from sub- to supersonic speeds in both reacting and nonreacting environments. This adoption can be attributed to the wealth of information that can be obtained via FRS, including the gas density, pressure, temperature, velocity, species composition, or, in some cases, several of these properties at once. This article reviews the current state of FRS methodology in recovering such gas properties. As knowledge of the fundamentals of Rayleigh scattering and spectral light filtering is crucial to the design of an FRS experiment, we begin by briefly reviewing these areas. Subsequently, we conduct a survey of experimental design strategies, assumptions, and data reduction methods used to measure different gas properties using FRS. We conclude the review with a short discussion on quantification of experimental uncertainty and future trends in FRS.

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Filtered Rayleigh Scattering-Based Concentration Measurements for a Horizontal Buoyant Jet

Abstract: Filtered Rayleigh Scattering (FRS) is a nonintrusive technique which is used to study a variety of flowfields.

Cited by 2 publications

References 13 publications

Early development of the veil-shaped secondary flow in horizontal buoyant jets

Early development of the veil-shaped secondary flow in horizontal buoyant jets

Quantitative gas property measurements by filtered Rayleigh scattering: a review

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