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  • 1
    Digitale Medien
    Digitale Medien
    Counter jet stagnation flows (1991)
    Springer
    Experiments in fluids 11 (1991), S. 313-324 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The present paper concerns the stagnation flow produced by counter flowing air jets. Little experimental information exists on such flows in spite of their extensive employment in the theoretical treatment of diffusion flames. To remedy this situation, laser-Doppler measurements were performed to quantify the entire flow field. The experiments are described and the results of the velocity measurements presented. Differences between the investigated flow field and the ideal flow field, employed in theoretical studies, are pointed out.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00194863
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Temperature and concentration measurements by CARS in counterflow laminar diffusion flames (1995)
    Springer
    Experiments in fluids 18 (1995), S. 376-382 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The combination of broadband CARS thermometry on nitrogen with the narrowband technique, for detection of a second major species, is applied to counterflow laminar propane-air diffusion flames. Temperature profiles are measured for various conditions of strain and equivalence ratio. Comparisons with 1D calculations of the flow with a detailed kinetic mechanism are satisfactory. Some measurements of CO concentrations are performed. Feasability of temperature measurements when the propane is replaced by liquid fuel (heptane) is demonstrated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00211395
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Structure of diffusion and premixed laminar counterflow flames including molecular radiative transfer (1993)
    Springer
    Combustion, explosion and shock waves 29 (1993), S. 306-311 
    Details
    ISSN: 1573-8345
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Maschinenbau
    Notizen: Abstract The interaction between radiation and combustion is studied theoretically in the case of strained counterflow nonluminous laminar flames. Both H2−O2 diffusion and C3H8-air premixed flames are considered. Calculations are based on detailed chemical kinetics and narrow-band statistical modeling of infrared radiative properties. It is shown that radiative transfer decreases the temperature level, which affects particularly the production and consumption of minor species and pollutants. For H2−O2 flames, a low strain rate extinction limit due to radiation is found. It is also shown that the commonly used approximation of optically thin medium is inaccurate, even for the small-scale laboratory flames considered here.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00797647
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Experimental and numerical study of transient laminar counterflow diffusion flames (1993)
    Springer
    Combustion, explosion and shock waves 29 (1993), S. 311-315 
    Details
    ISSN: 1573-8345
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Maschinenbau
    Notizen: Abstract In the present article, we analyze the nonsteady behavior of counterflow diffusion flames subjected to a time-dependent injection velocity in the case of hydrogen—air flames. The numerical study, using a finite-difference implicit linear multistep method and employing complex kinetics, is done for sinusoidal injection velocity variations, for moderate values and also for values near the extinction limit. The frequency response is obtained in these different cases. The experimental setup comprises two axisymmetric nozzles. In order to change the inlet velocities periodically, we use a vibrating mechanism in each burner. The amplitude and the frequency of injection velocities of the opposed nozzles are synchronously modified. The OH radical emission intensity is used to measure the flame response to velocity fluctuations. The experimental results are compared to numerical calculations. Good agreement is obtained in this comparison.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00797648
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