Emission and Raman Spectroscopy Measurements in Hypersonic Nitrogen Flows

Pilverdier, H.; Brun, R.; Dumitrescu, Michel

doi:10.2514/2.6637

Cited by 13 publications

(9 citation statements)

References 10 publications

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“…Previous spectroscopic measurements at the TCM2 hypersonic facility have highlighted the importance of reducing test gas contamination. Pilverdier et al noticed that a Mylar secondary diaphragm displayed significantly less emissive intensity than one made from copper [34]. The HET facility operates with a Mylar diaphragm.…”

Section: E No Resultsmentioning

confidence: 99%

“…Emission spectroscopy can provide useful data for facility characterization. At the TCM2 free-piston shock tunnel in France, emission spectra have been used to calculate useful test times and demonstrate test-time homogeneity for different operating conditions [34,35]. Test-time determination and species identification in the JX1 expansion tube facility using emission spectroscopy was performed by Ramjuan et al [36].…”

Section: Introductionmentioning

confidence: 99%

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NO and OH Spectroscopic Vibrational Temperature Measurements in a Post-Shock Relaxation Region

et al. 2010

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In this paper, spatial temperature profiles are examined in the nonequilibrium relaxation region behind a stationary shock wave in a hypervelocity air Mach 7.42 freestream. The normal shock wave is established through a Mach reflection from an opposing wedge arrangement in an expansion tube facility. Schlieren images confirm that the shock configuration is steady and the location is repeatable. Emission spectroscopy is used to identify dissociated species and to make vibrational temperature measurements using both the nitric oxide and the hydroxyl radical A-X band sequences. Temperature measurements are presented at selected locations behind the normal shock. LIFBASE is used as the simulation spectrum software for OH temperature-fitting; however, the need to access higher vibrational and rotational levels for NO leads to the use of an in-house developed algorithm. For NO, results demonstrate the contribution of higher vibrational and rotational levels to the spectra at the conditions of this study. Very good agreement is achieved between the experimentally measured NO vibrational temperatures and calculations performed using an existing state-resolved, three-dimensional forced-harmonic oscillator thermochemical model. The measured NO vibrational temperatures are significantly higher than the OH temperatures.

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Section: E No Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

NO and OH Spectroscopic Vibrational Temperature Measurements in a Post-Shock Relaxation Region

et al. 2010

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“…Pilverdier et al noticed that a mylar secondary diaphragm displayed significantly less emissive intensity than one made from copper. 24 The HET facility already operates with a mylar diaphragm. Ramjuan et al also emphasized the importance of cleaning the facility.…”

Section: E No Resultsmentioning

confidence: 99%

“…At the TCM2 free-piston shock tunnel in France, emission spectra have been used to calculate useful test times and demonstrate test time homogeneity for different operating conditions. 24,25 Test time determination and species identification in the JXI expansion tube facility using emission spectroscopy was performed by Ramjuan et al…”

mentioning

confidence: 99%

Spectroscopic Measurements in the Shock Relaxation Region of a Hypervelocity Mach Reflection

Sharma

Austin

Glumac

et al. 2009

39th AIAA Fluid Dynamics Conference

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We examine the spatial temperature profile in the non-equilibrium relaxation region behind a stationary shock wave. The normal shock wave is established through a Mach reflection configuration from an opposing wedge arrangement for a hypervelocity air Mach 7.42 freestream. Schlieren images confirm that the shock configuration is steady and the location is repeatable. Emission spectroscopy is used to identify dissociated species and to obtain vibrational temperature measurements using the NO and OH A-X band sequences. Temperature measurements are presented at selected locations behind the normal shock. LIFBASE is used as the simulation spectrum software for OH temperature-fitting, however the need to access higher vibrational and rotational levels for NO leads to the use of an in-house developed algorithm. For NO, results demonstrate the contribution of higher vibrational and rotational levels to the spectra at the conditions of this study. Very good agreement is achieved between the experimentally measured NO vibrational temperatures and calculations performed using a state-resolved, one-dimensional forced harmonic oscillator thermochemical model.

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“…Therefore, if both signals are captured, they offer a way to record simultaneous temperature and concentration in reacting and non-reacting¯ows. Hassel and Linow [213] have reviewed many of the advances in this combined Raman and Rayleigh method and a spontaneous Raman scattering method for application to hypersonic nitrogen¯ows has recently been demonstrated by Pilverdier et al [215] in a freepiston Mach 6±8 shock tunnel. A purely Rayleighbased method termed ®ltered Rayleigh scattering (FRS) has also been applied to measure instantaneous and average temperature ®elds from a hydrogen Hencken burner [216].…”

Section: Raman and Rayleigh Spectroscopiesmentioning

confidence: 99%

The application of laser measurement techniques to aerospace flows

Lawson

2004

Proceedings of the Institution of Mechanical Engineers, Part G:

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Laser measurement techniques are becoming more commonly applied to many areas of thermo¯uids and heat transfer. An area of their application, which presents highly challenging requirements, is in the measurement of aerospace¯ows. In this case the experimentalist may encounter high mass¯owrates, high-speed¯ows and in some cases high temperatures, and the measurements may also have to be taken with restricted optical access. Such types of¯ow have already been measured using established laser techniques such as particle image velocimetry, laser Doppler anemometry, laser-induced¯uorescence and liquid crystal thermography. Other more recent techniques which have seen application include Doppler global velocimetry and molecular tagging velocimetry for velocity measurement and thermographic phosphor thermometry for surface temperature measurement. This paper reviews the most recent advances in laser techniques and their application to aerospace environments.

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Emission and Raman Spectroscopy Measurements in Hypersonic Nitrogen Flows

Cited by 13 publications

References 10 publications

NO and OH Spectroscopic Vibrational Temperature Measurements in a Post-Shock Relaxation Region

NO and OH Spectroscopic Vibrational Temperature Measurements in a Post-Shock Relaxation Region

Spectroscopic Measurements in the Shock Relaxation Region of a Hypervelocity Mach Reflection

The application of laser measurement techniques to aerospace flows

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