Measurement of temperature, velocity and water vapor concentration in a scramjet combustor based on near-infrared diode laser absorption

F, Li; LH, Chen; XL, Yu; Z, Li; HB, Gu; Xy, Zhang

doi:10.2514/6.2011-2214

Cited by 7 publications

(13 citation statements)

References 10 publications

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“…Water vapor absorption feature centered at 7185.597 cm −1 (i.e., e ν 0 ) was used in this analysis. This transition has been applied extensively in practice due to its relatively strong absorption strength at high temperatures and its isolation from interfering transitions in its vicinity [14,18].…”

Section: Uncertainty In Velocity Measurements Caused By Nonuniform Flmentioning

confidence: 99%

“…3.A and 3.B, respectively. The analyses were conducted under the context of applications in our scramjet facility as reported in [18], where the typical flow conditions at the measurement location are Mach number of 1.83, static temperature of 600 K, and static pressure of 1.0 atm. Water vapor absorption feature centered at 7185.597 cm −1 (i.e., e ν 0 ) was used in this analysis.…”

Section: Uncertainty In Velocity Measurements Caused By Nonuniform Flmentioning

confidence: 99%

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Uncertainty in velocity measurement based on diode-laser absorption in nonuniform flows

Cai

et al. 2012

Appl. Opt.

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This work investigates the error caused by nonuniformities along the line-of-sight in velocity measurement using tunable diode-laser absorption spectroscopy (TDLAS). Past work has demonstrated TDLAS as an attractive diagnostic technique for measuring velocity, which is inferred from the Doppler shift of two absorption features using two crossing laser beams. However, because TDLAS is line-of-sight in nature, the obtained velocity is a spatially averaged value along the probing laser beams. As a result, nonuniformities in the flow can cause uncertainty in the velocity measurement. Therefore, it is the goal of this work to quantify the uncertainty caused by various nonuniformities typically encountered in practice, including boundary layer effects, the divergence/convergence of the flow, and the methods used to fit the Doppler shift. Systematic analyses are performed to quantify the uncertainty under various conditions, and case studies are reported to illustrate the usefulness of such analysis in interpreting experimental data obtained from a scramjet facility. We expect this work to be valuable for the design and optimization of TDLAS-based velocimetry, and also for the quantitative interpretation of the measurements.

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Section: Uncertainty In Velocity Measurements Caused By Nonuniform Flmentioning

confidence: 99%

Section: Uncertainty In Velocity Measurements Caused By Nonuniform Flmentioning

confidence: 99%

Uncertainty in velocity measurement based on diode-laser absorption in nonuniform flows

Cai

et al. 2012

Appl. Opt.

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show abstract

“…Water vapor absorption feature centered at 7185.597 cm -1 (i.e.,  0 ) was used in this analysis. This transition has been applied extensively in practice due to its relatively strong absorption strength at high temperatures and its isolation from interfering transitions in its vicinity [14,18].…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The analyses were conducted under the context of applications in our scramjet facility as reported in [18], where the typical flow conditions at the measurement location are: Mach number of 1.83, static temperature of 600 K, and static pressure of 1.0 atm. Water vapor absorption feature centered at 7185.597 cm -1 (i.e.,  0 ) was used in this analysis.…”

Section: Simulation Resultsmentioning

confidence: 99%

Uncertainty Analysis of Velocity Measured by Diode-Laser Absorption Spectroscopy in a Scramjet Facility

Cai

et al. 2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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This work investigates the error caused by non-uniformities along the line-of-sight in velocity measurement using tunable diode-laser absorption spectroscopy (TDLAS). Past work has demonstrated TDLAS as an attractive diagnostic technique for measuring velocity, which is inferred from the Doppler shift of two absorption features using two crossing laser beams. However, because TDLAS is line-of-sight in nature, the obtained velocity is a spatially-averaged value along the probing laser beams. As a result, non-uniformities in the flow can cause uncertainty in the velocity measurement. Therefore, it is the goal of this work to quantify the uncertainty caused by various non-uniformities typically encountered in practice, including boundary layer effects, the divergence/convergence of the flow, and the methods (direct absorption vs. wavelength modulation) used to fit the Doppler shift. Systematic analyses are performed to quantify the uncertainty under various conditions, and case studies are reported to illustrate the usefulness of such analysis in interpreting experimental data obtained from a scramjet facility. We expect this work to be valuable for the design and optimization of TDLAS-based velocimetry, and also for the quantitative interpretation of the measurements.

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“…It was validated by a series of experimental data [13] and can be applied as a tool to analyze the engine performance in different combustion modes.…”

Section: Introductionmentioning

confidence: 99%

Engine performance analysis and optimization of a dual-mode scramjet with varied inlet conditions

et al. 2015

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A dual-mode scramjet can operate in a wide range of flight conditions. Higher thrust can be generated by adopting suitable combustion modes. Based on the net thrust, an analysis and preliminary optimal design of a kerosene-fueled parameterized dual-mode scramjet at a crucial flight Mach number of 6 were investigated by using a modified quasi-one-dimensional method and simulated annealing strategy. Engine structure and heat release distributions, affecting the engine thrust, were chosen as analytical parameters for varied inlet conditions (isolator entrance Mach number: 1.5-3.5). Results show that different optimal heat release distributions and structural conditions can be obtained at five different inlet conditions. The highest net thrust of the parameterized dual-mode engine can be achieved by a subsonic combustion mode at an isolator entrance Mach number of 2.5. Additionally, the effects of heat release and scramjet structure on net thrust have been discussed. The present results and the developed analytical method can provide guidance for the design and optimization of high-performance dual-mode scramjets.

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Measurement of temperature, velocity and water vapor concentration in a scramjet combustor based on near-infrared diode laser absorption

Cited by 7 publications

References 10 publications

Uncertainty in velocity measurement based on diode-laser absorption in nonuniform flows

Uncertainty in velocity measurement based on diode-laser absorption in nonuniform flows

Uncertainty Analysis of Velocity Measured by Diode-Laser Absorption Spectroscopy in a Scramjet Facility

Engine performance analysis and optimization of a dual-mode scramjet with varied inlet conditions

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