The stabilization mechanism of the lifted jet diffusion flame in the hysteresis region

Cheng Kuang Lin, Ming Shan Jeng, Yei Chin Chao

研究成果: Article同行評審

30 引文 斯高帕斯(Scopus)

摘要

Recent experimental efforts focused on near-field coherent vortex dynamics, and their impact on stabilization of a lifted jet diffusion flame in the hysteresis region are reported. Simultaneous jet flow and flame visualizations are conducted first to obtain a global feature of flow/flame interaction. The statistical liftoff heights are calculated by a DIP (digital image processing) method. The gas concentration and velocity distributions induced by the vortex evolution as well as the corresponding flame front motion are deduced from phase-averaged measurements of planar Mie-scattering gas concentration images, LDV and ion-signals, respectively. The planar gas concentration technique employed here extends our previous work (Chao et al. 1990, 1991 a) to include phase-averaging. Results of the experiments show that the most probable flame base locations in the hysteresis region are at the coherent vortex roll-up and pairing locations. The deeply entrained air lump caused by large-scale vortices during roll-up and pairing is the main obstruction to flame propagation back to the nozzle exit and causes the hysteresis phenomenon.

原文English
頁(從 - 到)353-365
頁數13
期刊Experiments in Fluids: Experimental Methods and their Applications to Fluid Flow
14
發行號5
DOIs
出版狀態Published - 1993 4月

All Science Journal Classification (ASJC) codes

  • 計算力學
  • 材料力學
  • 物理與天文學 (全部)
  • 流體流動和轉移過程

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