Nonintrusive Pressure and Temperature Measurements in an Underexpanded Sonic Jet Flowfield

Woodmansee, M. A.; Iyer, Venkatraman; Dutton, J. C.; Lucht, Robert P.

doi:10.2514/1.10418

Cited by 28 publications

(13 citation statements)

References 23 publications

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“…The flowfield that was examined to demonstrate the MTV techniques was the underexpanded jet flowfield for which the main structures have been discussed in detail [26,27]. The main structures with their labels are shown schematically in Fig.…”

Section: Methodsmentioning

confidence: 99%

Two-Component Molecular Tagging Velocimetry Utilizing NO Fluorescence Lifetime and NO2 Photodissociation Techniques in an Underexpanded Jet Flowfield

Hsu

North

Srinivasan

et al. 2009

39th AIAA Fluid Dynamics Conference

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We report the application of molecular tagging velocimetry (MTV) toward two-component velocimetry as demonstrated in an underexpanded free jet flowfield. Two variants of the MTV technique are presented: 1) electronic excitation of seeded nitric oxide (NO) with gated fluorescence imaging (fluorescence lifetime) and 2) photodissociation of seeded NO 2 followed by NO fluorescence imaging (NO 2 photodissociation). The seeded NO fluorescence lifetime technique is advantageous in low-quenching, high-velocity flowfields, while the photodissociation technique is useful in high-quenching environments, and either highor low-velocity flowfields due to long lifetime of the NO photoproduct. Both techniques are viable for single-shot measurements, with determined root mean squared results for streamwise and radial velocities of ∼5%. This study represents the first known application of MTV utilizing either the fluorescence lifetime or the photodissociation technique toward two-component velocity mapping in a gaseous flowfield. Methods for increasing the spatial resolution to be comparable to particle-based tracking techniques are discussed.

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Section: Methodsmentioning

confidence: 99%

Two-Component Molecular Tagging Velocimetry Utilizing NO Fluorescence Lifetime and NO2 Photodissociation Techniques in an Underexpanded Jet Flowfield

Hsu

North

Srinivasan

et al. 2009

39th AIAA Fluid Dynamics Conference

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“…Thus, the only papers providing quantitative results for the length of the potential core [30,156] [30,65,59,135,[157][158][159][160][161][162][163][164][165][166][167][168][169][170][171][172][173][174]149,122,61,94] yet some numerical papers are also available [37,59,122,[175][176][177][178][179][180][181]. These structures play a major and significant role in the behavior of the jet, especially in its spreading rate and the associated decay, because of their interaction with the various shock waves [134,38,158,156,164,52,149,178,166,171]<...>…”

Section: Wavelength Of the Cell Structuresmentioning

confidence: 98%

“…Since the first numerical studies, and even now, the easiest way and the less expensive from a computational point of view is to consider the Reynolds Averaged Navier-Stokes equations (if obviously the flow is turbulent). Logically, this approach has been largely tested [110,31,132,63,138,243,34,216,218,116,45,220,84,21,22,55,[267][268][269][270][271]122,249], with the k ε − model in an overwhelming majority of papers (be it its incompressible formulation or some of the proposed compressibility corrections of the k CC ε − − class model). Even if this approach is acceptable to obtain the mean behavior of the flow, there are still some discrepancies between the results obtained with the various turbulence models (k ε…”

Section: Modeling Approachesmentioning

confidence: 99%

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Free underexpanded jets in a quiescent medium: A review

Franquet

Perrier

Gibout

et al. 2015

Progress in Aerospace Sciences

240

113

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“…The flowfield that was examined for demonstration of the velocity mapping was the axially symmetric highly underexpanded jet. The terminology that will be used in this study was referenced from Woodmansee (2004). The structure of the highly underexpanded jet is well known [e.g., see Donaldson (1971)].…”

Section: Single Component Molecular Tagging Velocimetrymentioning

confidence: 99%

Application of advanced laser diagnostics to hypersonic wind tunnels and combustion systems.

North

Hsu

Frank³

2009

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This LDRD was a Sandia Fellowship that supported Andrea Hsu's PhD research at Texas A&M University and her work as a visitor at Sandia's Combustion Research Facility. The research project at Texas A&M University is concerned with the experimental characterization of hypersonic (Mach>5) flowfields using experimental diagnostics. This effort is part of a Multidisciplinary University Research Initiative (MURI) and is a collaboration between the Chemistry and Aerospace Engineering departments. Hypersonic flight conditions often lead to a non-thermochemical equilibrium (NTE) state of air, where the timescale of reaching a single (equilibrium) Boltzmann temperature is much longer than the timescale of the flow. Certain molecular modes, such as vibrational modes, may be much more excited than the translational or rotational modes of the molecule, leading to thermal-nonequilibrium. A nontrivial amount of energy is therefore contained within the vibrational mode, and this energy cascades into the flow as thermal energy, affecting flow properties through vibrational-vibrational (V-V) and vibrational-translational (V-T) energy exchanges between the flow species. The research is a fundamental experimental study of these NTE systems and involves the application of advanced laser and optical diagnostics towards hypersonic flowfields. The research is broken down into two main categories: the application and adaptation of existing laser and optical techniques towards characterization of NTE, and the development of new molecular tagging velocimetry techniques which have been demonstrated in an underexpanded jet flowfield, but may be 4 extended towards a variety of flowfields. In addition, Andrea's work at Sandia National Labs involved the application of advanced laser diagnostics to flames and turbulent non-reacting jets. These studies included quench-free planar laser-induced fluorescence measurements of nitric oxide (NO) and mixture fraction measurements via Rayleigh scattering. 5 ACKNOWLEDGMENTS

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Nonintrusive Pressure and Temperature Measurements in an Underexpanded Sonic Jet Flowfield

Cited by 28 publications

References 23 publications

Two-Component Molecular Tagging Velocimetry Utilizing NO Fluorescence Lifetime and NO2 Photodissociation Techniques in an Underexpanded Jet Flowfield

Two-Component Molecular Tagging Velocimetry Utilizing NO Fluorescence Lifetime and NO2 Photodissociation Techniques in an Underexpanded Jet Flowfield

Free underexpanded jets in a quiescent medium: A review

Application of advanced laser diagnostics to hypersonic wind tunnels and combustion systems.

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