Simultaneous 2D filtered Rayleigh scattering thermometry and stereoscopic particle image velocimetry measurements in turbulent non-premixed flames

McManus, Thomas A.; Sutton, Jeffrey A.

doi:10.1007/s00348-020-02973-z

Cited by 22 publications

(7 citation statements)

References 49 publications

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“…Iodine is chosen as the filter since its spectral is broader than the narrow linewidth laser, but narrower than the RBS profile. The spectral signal collected by the detector is a superposition of iodine transmission curve and RBS of the observed volume element [2,30,31]. By tuning the incident laser frequency into the blocking range, surface/particle scattering is then absorbed by the iodine filter.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional thermometry measurements in confined swirl flames using filtered Rayleigh scattering

Chen

2021

Appl. Phys. B

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Two-dimensional temperature measurements using filtered Rayleigh scattering (FRS) were performed in confined CH 4 /air swirl flames at atmospheric pressure. The investigated burner has a combustion chamber consisted of four quartz windows. The combustion chamber is 160 mm high with a square section of 50 × 50 mm 2 . Measurements were challenging due to the strong interference from the incident laser impinging onto quartz windows, wall reflection and Mie scattering. Comparisons between the FRS and a conventional probe-based thermocouple were conducted through several investigated cases. Five operating conditions were studied with the equivalence ratios (Φ) of the premixed CH 4 /air mixture covered a range of 0.67-0.83. Under each condition, five cross sections (C.S.) of the swirl flame were investigated and compared to analyze (1) the flame structures and temperature distributions of the instantaneous FRS images and (2) the uniform temperature radius as well as the joint probability density function (PDF) profiles of the averaged FRS signals. Results indicate that FRS can effectively suppress the background scattering and the average standard deviation of FRS measurements throughout the experiment is < 7.5%. The thermochemical state of the confined swirl flames is strongly influenced by Φ, leading to varieties of flame structures and temperature distributions.

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Section: Introductionmentioning

confidence: 99%

Two-dimensional thermometry measurements in confined swirl flames using filtered Rayleigh scattering

Chen

2021

Appl. Phys. B

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“…The dependence of equation ( 10) on flow velocity is negated if the flow is stagnant or if the detector is positioned so that the Doppler shift is sensitive to a negligibly small component of velocity. If this is not possible, simultaneous PIV and FRS measurements can be performed [100], as first demonstrated by Most and Leipertz [101]. Additional thermodynamic properties of the scattering gas must be known to calculate the differential scattering cross section.…”

Section: Temperaturementioning

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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“…This becomes increasingly challenging when the turbulent interaction between velocity and scalar fields has to be characterised. Experimental approaches include the combined use of particle image velocimetry with tracer laser induced fluorescence [1][2][3], laser induced phosphorescence [4][5][6], or filtered Rayleigh scattering (FRS) [7,8] to measure velocity, temperature, or concentration fluctuations to derive scalar transport correlations. All of these approaches have in common that they rely on foreign tracer particles or molecules and, therefore, require careful tracer selection with respect to aerodynamic and photo-physical properties as well as a thorough calibration procedure for each experiment.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved multi-parameter flow diagnostics by filtered Rayleigh scattering: system design through multi-objective optimisation

Doll

Röhle

Dues³

et al. 2022

Meas. Sci. Technol.

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The measurement of the time-resolved three-component (3C) velocity field together with scalar flow quantities such as temperature or pressure by laser-optical diagnostics is a challenging task. Current approaches usually employ combinations of different methods relying on tracer particles or molecules. This typically requires usage of at least two laser systems and detection units as well as elaborate calibration of the luminous properties of the applied tracer species with regard to the specific thermodynamic conditions anticipated for the flow case at hand. In contrast to this, the tracer-free filtered Rayleigh scattering (FRS) technique has been proven to obtain combined time-averaged velocity and scalar fields and might offer a viable alternative for unsteady flow diagnostics. By applying multiple perspective views, two detection system variants are presented, combining 1) six observation branches with one camera/molecular filter and 2) three camera views with two cameras and molecular filters of differing vapour densities. Both configurations in principle allow for the simultaneous measurement of instantaneous 3C velocity, temperature and pressure fields. Multi-objective optimisation is used to enhance the detection setups for different sets of experimental configurations. It is shown that a higher number of observation positions and the associated dynamics of the FRS signal prove to be advantageous compared to the use of less views in combination with two acquisition channels equipped with different molecular filters. It is also shown that the use of circularly polarised laser light offers no advantage over linear polarisation. By demonstrating a moderate sensitivity of the optimised observation arrangement to alignment errors, the presented FRS concept provides a practical solution for the simultaneous measurement of time-resolved 3C flow velocity and scalar fields.

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Simultaneous 2D filtered Rayleigh scattering thermometry and stereoscopic particle image velocimetry measurements in turbulent non-premixed flames

Cited by 22 publications

References 49 publications

Two-dimensional thermometry measurements in confined swirl flames using filtered Rayleigh scattering

Two-dimensional thermometry measurements in confined swirl flames using filtered Rayleigh scattering

Quantitative gas property measurements by filtered Rayleigh scattering: a review

Time-resolved multi-parameter flow diagnostics by filtered Rayleigh scattering: system design through multi-objective optimisation

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