Three-dimensional concentration field imaging in a swirling flame via endoscopic volumetric laser-induced fluorescence a
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ree-dimensional concentration field imaging in a swirling flame via endoscopic volumetric laser-induced fluorescence at 10-kHz-rate 1
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WANG Qian , LIU HeCong , LIU XunChen , WANG SiRui , FU Chen , WANG GuoQing , 1 1 1 GAO Yi , CAI WeiWei & QI Fei 1
Key Laboratory of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong 2
University, Shanghai 200240, China; State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
Received September 21, 2019; accepted March 23, 2020; published online May 19, 2020
Citation:
Wang Q, Liu H C, Liu X C, et al. Three-dimensional concentration field imaging in a swirling flame via endoscopic volumetric laser-induced fluorescence at 10-kHz-rate. Sci China Tech Sci, 2020, 63, https://doi.org/10.1007/s11431-019-1574-4
Optical combustion diagnostics are indispensable tools to investigate flame dynamics and excavate in-situ quantities of flames, such as velocity, temperature, concentration of key intermediates and pressure without introducing probe perturbation. For example, velocity and flame temperature can be obtained using techniques such as particle image velocimetry, coherent anti-Stokes Raman scattering spectroscopy, Rayleigh scattering and tunable diode laser absorption spectroscopy, respectively. Among the most widely adopted techniques, planar laser induced fluorescence (PLIF) has been widely used in imaging key combustion intermediate and seeded tracers. By probing the fluorescence intensity at two frequencies, PLIF is one of the most robust technique to obtain flame temperature in the presence of window and particle scattering. Despite these successes, PLIF still has limitations in studying the salient three-dimensional (3D) behaviors of flames. Efforts had been devoted to realizing 3D PLIF measurements over the past decades. One possible approach was via successive scanning. The second approach was to combine PLIF measurements with stereoscopic imaging technique which captured images from a pair of views with the help of relatively thick laser sheets and then obtained spatial information in depth direction using ste*
Corresponding author (email: [email protected])
reoscopic algorithms. However, the first method results in low spatial resolution as there are only a limited number of laser layers to scan or low temporal resolution when spatial resolution needs to be improved. The second approach has difficulties in improving spatial resolution caused by the relatively thick laser sheet. As a combination of laser induced fluorescence detection and tomographic reconstruction, volumetric laser induced fluorescence (VLIF) was first demonstrated by Wu et al. [1] to obtain turbulent flow structure through the distribution of iodine seeded in a jet with five cameras simultaneously capturing fluorescence signals. The VLIF technique has also been demonstrated to extract 3D distributions of key combustion species, such as OH radicals with high spatial and temporal reso
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