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10 February 2009Flame behaviors of propane/air premixed flame propagation in a closed rectangular duct with a 90-deg bend
Experiments of flame propagation in a small, closed rectangular duct with a 90° bend were performed for a propane-air
mixture. The high speed camera and Schlieren techniques were used to record images of flame propagation process in
the combustion pipe. Meanwhile, the fine thermocouples and ion current probes were applied to measure the temperature
distribution and reaction intensity of combustion. The characteristics of propane-air flame and its microstructure were
analyzed in detail by the experimental results. In the test, the special tulip flame formation was observed. Around the
bend, the flame tip proceeded more quickly at the lower side with the flame front elongated toward the axial direction.
And transition to turbulent flame occurred. It was suggested that fluctuations of velocity, ion current and temperature
were mainly due to the comprehensive effects of multi-wave and the intense of turbulent combustion.
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Xuechao He, Jinhua Sun, K. K. Yuen, Yibin Ding, Sining Chen, "Flame behaviors of propane/air premixed flame propagation in a closed rectangular duct with a 90-deg bend," Proc. SPIE 7126, 28th International Congress on High-Speed Imaging and Photonics, 71260P (10 February 2009);