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CH double-pulsed PLIF measurement in turbulent premixed flame

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Abstract

The flame displacement speeds in turbulent premixed flames have been measured directly by the CH double-pulsed planar laser-induced fluorescence (PLIF). The CH double-pulsed PLIF systems consist of two independent conventional CH PLIF measurement systems and laser beams from each laser system are led to same optical pass using the difference of polarization. The highly time-resolved measurements are conducted in relatively high Reynolds number turbulent premixed flames on a swirl-stabilized combustor. Since the time interval of the successive CH PLIF can be selected to any optimum value for the purpose intended, both of the large scale dynamics and local displacement of the flame front can be discussed. By selecting an appropriate time interval (100–200 μs), deformations of the flame front are captured clearly. Successive CH fluorescence images reveal the burning/generating process of the unburned mixtures or the handgrip structures in burnt gas, which have been predicted by three-dimensional direct numerical simulations of turbulent premixed flames. To evaluate the local flame displacement speed directly from the successive CH images, a flame front identification scheme and a displacement vector evaluation scheme are developed. Direct measurements of flame displacement speed are conducted by selecting a minute time interval (≈30 μs) for different Reynolds number (Re λ = 63.1–115.0). Local flame displacement speeds coincide well for different Reynolds number cases. Furthermore, comparisons of the mean flame displacement speed and the mean fluid velocity show that the convection in the turbulent flames will affect the flame displacement speed for high Reynolds number flames.

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Acknowledgments

This work is partially supported by Grant-in-Aid for Scientific Research (A) (No.15206023) of Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan

    M. Tanahashi, S. Taka, M. Shimura & T. Miyauchi

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  1. M. Tanahashi
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  2. S. Taka
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  3. M. Shimura
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  4. T. Miyauchi
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Correspondence to M. Tanahashi.

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Tanahashi, M., Taka, S., Shimura, M. et al. CH double-pulsed PLIF measurement in turbulent premixed flame. Exp Fluids 45, 323–332 (2008). https://doi.org/10.1007/s00348-008-0482-8

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  • DOI: https://doi.org/10.1007/s00348-008-0482-8

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