Review of Filtered Rayleigh Scattering technique for mixing studies in supersonic air flow

Gopal, Vijay; Maddalena, Luca

doi:10.1016/j.paerosci.2020.100679

Cited by 4 publications

(4 citation statements)

References 57 publications

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“…While air is itself a mixture, it can be treated as a single species with mixture-averaged thermophysical and transport properties [110]. Mixture composition can be measured because each species has a unique differential scattering cross section, dσ dΩ , and lineshape, R. The FRS signal variation caused by a change in gas composition is often assumed to be due solely to the differential scattering cross section term because it has a stronger dependence on the gas composition than the integrated lineshape [45,92]. Consequently, experiments are typically designed to isolate the signal dependence on the differential scattering cross section.…”

Section: Mixture Compositionmentioning

confidence: 99%

“…Heavier hydrocarbon fuels can also be used because they have scattering cross sections that are as much as 10-15 times larger than that of air. A more detailed derivation of equation ( 12) can be found in Gopal and Maddalena [45,114] who also discuss the assumptions required to use the equation and the resulting uncertainties of the method.…”

Section: Mixture Compositionmentioning

confidence: 99%

“…Nevertheless, they were able to demonstrate the feasibility of the technique. This approach was also used by Maddalena et al to quantify the time-averaged mixture composition of supersonic flowfields dominated by streamwise vortices at conditions relevant to scramjet-powered hypersonic flight [45,93,[114][115][116]. In these experiments, helium was injected through a ramped-strut injector to simulate the dynamics of hydrogen fuel.…”

Section: Mixture Compositionmentioning

confidence: 99%

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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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Section: Mixture Compositionmentioning

confidence: 99%

Section: Mixture Compositionmentioning

confidence: 99%

Section: Mixture Compositionmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative gas property measurements by filtered Rayleigh scattering: a review

Ground¹,

Hunt²,

Hunt³

2023

Meas. Sci. Technol.

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“…In recent years, many scholars have studied the measurement and distortion characteristics of aero-optical effects, mainly focusing on the analysis of flow field structure and image distortion. The high-frequency sampling structure of high-speed turbulence could be obtained via laser scattering technology [13,14]. Through a statistical analysis, it could be found that the distortion characteristics caused by aero-optical effects are closely related to different turbulence scale structures [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A New Method for Analyzing the Aero-Optical Effects of Hypersonic Vehicles Based on a Microscopic Mechanism

Yang

Liu

et al. 2022

Aerospace

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Aero-optical effects are the key factors that restrict the accuracy of the optical sensors of hypersonic vehicles, and the numerical simulation of aero-optical effects is a powerful tool with which to analyze aero-optical distortion. Most existing research focuses on the simulation analysis of refraction distortion based on the density field at the macro level via the ray-tracing method. In this paper, a method for analyzing aero-optical effects based on the interaction between photons and gas molecules is proposed and can explain the optical distortion and energy dissipation caused by aero-optical effects at the micro level. By establishing a transmission model of photons in turbulence, a simulation method of aero-optical effects based on a microscopic mechanism is designed and breaks through the limitations of a traditional macro method in energy analyses. The optical distortion parameters based on photonics are compared with the physical quantities of traditional aero-optical effects, which verifies the effectiveness of the micro analysis on the macro scale and provides a new idea for studying the microscopic mechanism of aero-optical effects.

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Three-dimensional inhomogeneous temperature tomography of confined-space flame coupled with wall radiation effect by instantaneous light field

Niu

Gao

et al. 2023

International Journal of Heat and Mass Transfer

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Review of Filtered Rayleigh Scattering technique for mixing studies in supersonic air flow

Cited by 4 publications

References 57 publications

Quantitative gas property measurements by filtered Rayleigh scattering: a review

Quantitative gas property measurements by filtered Rayleigh scattering: a review

A New Method for Analyzing the Aero-Optical Effects of Hypersonic Vehicles Based on a Microscopic Mechanism

Three-dimensional inhomogeneous temperature tomography of confined-space flame coupled with wall radiation effect by instantaneous light field

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