Abstract
The applications of femtosecond lasers to the diagnostics of combustion and flow field have recently attracted increasing interest. Many novel spectroscopic methods have been developed in obtaining non-intrusive measurements of temperature, velocity, and species concentrations with unprecedented possibilities. In this paper, several applications of femtosecond-laser-based incoherent techniques in the field of combustion diagnostics were reviewed, including two-photon femtosecond laser-induced fluorescence (fs-TPLIF), femtosecond laser-induced breakdown spectroscopy (fs-LIBS), filament-induced nonlinear spectroscopy (FINS), femtosecond laser-induced plasma spectroscopy (FLIPS), femtosecond laser electronic excitation tagging velocimetry (FLEET), femtosecond laser-induced cyano chemiluminescence (FLICC), and filamentary anemometry using femtosecond laser-extended electric discharge (FALED). Furthermore, prospects of the femtosecond-laser-based combustion diagnostic techniques in the future were analyzed and discussed to provide a reference for the relevant researchers.
Highlights
Development of advanced combustion technologies with high efficiency and low emission requires an understanding of the complex processes involving multi-scale kinetic reactions and turbulent flows.Numerous key parameters and information rely on accurate diagnostics techniques
The H fs-two-photon laser-induced fluorescence (TPLIF) technique was first demonstrated in combustion by Kulatilaka et al [30,46]
With the evolution of fs lasers and their gradual applications to the field of combustion, some velocity measurement techniques based on fs lasers have been developed, including femtosecond laser electronic excitation tagging (FLEET) and femtosecond laser-induced cyano chemiluminescence (FLICC)
Summary
Development of advanced combustion technologies with high efficiency and low emission requires an understanding of the complex processes involving multi-scale kinetic reactions and turbulent flows. The H fs-TPLIF technique was first demonstrated in combustion by Kulatilaka et al [30,46] The advantage of fs lasers excitation over traditional ns lasers excitation in O measurements is that the photolysis of vibrationally excited CO2, known as the main interference that produces additional O atoms [59], can Kulatilaka et al [52] performed an fs-TPLIF diagnosis for O in premixed laminar flame.
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