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Kinetics of I2 and HI photodissociation with implications in flame diagnostics

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Abstract

This paper investigates the application of iodine (I2) tracer in reactive flows to image the concentration filed by using photodissociation spectroscopy (PDS). The PDS technique first uses a short laser pulse to completely photodissociate iodine-containing species into iodine atoms, and then uses a second laser pulse to image the iodine atoms. Due to the completeness and rapidity of the photodissociation (PD), the concentration of I atoms after PD represents that of the iodine element seeded into the flow, which forms a conserved scalar and can be used to image the concentration field. The feasibility of the PDS technique is evaluated in three steps. First, a multi-level kinetic model was developed to capture the major physics relevant to the PDS technique. Second, controlled experiments were conducted to validate the multi-level kinetic model. Third, the validated model was applied to evaluate the applicable range and accuracy of the PDS technique in representative hydrocarbon flames. The results suggest a simple approach to implement the PDS technique using I2 seeding in flames, which can provide good accuracy across a wide range of mixture fractions and strain rates.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Clemson University, Clemson, SC, 29631, USA

    Y. Zhao, C. Tong & L. Ma

  2. Laser Diagnostic Lab, Room 233 Fluor Daniel Building, Clemson University, Clemson, SC, USA

    L. Ma

Authors
  1. Y. Zhao
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  2. C. Tong
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  3. L. Ma
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Correspondence to L. Ma.

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Zhao, Y., Tong, C. & Ma, L. Kinetics of I2 and HI photodissociation with implications in flame diagnostics. Appl. Phys. B 104, 689–698 (2011). https://doi.org/10.1007/s00340-011-4436-0

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  • DOI: https://doi.org/10.1007/s00340-011-4436-0

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