Investigation of non-premixed flame combustion characters in GO2/GH2 shear coaxial injectors using non-intrusive optical diagnostics
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- 作者：Jian Dai ; NanJia Yu ; GuoBiao Cai
- 关键词：liquid rocket engine ; shear coaxial injector ; non ; intrusive optical techniques ; image segmentation ; fractal analysis
- 刊名：SCIENCE CHINA Physics, Mechanics & Astronomy
- 出版年：2015
- 出版时间：December 2015
- 年：2015
- 卷：58
- 期：12
- 全文大小：2,683 KB
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NanJia Yu (1)
GuoBiao Cai (1)
1. Beijing University of Aeronautics and Astronautics, Beijing, 100191, China - 刊物类别：Physics and Astronomy
- 刊物主题：Physics
Chinese Library of Science
Mechanics, Fluids and Thermodynamics
Physics - 出版者：Science China Press, co-published with Springer
- ISSN：1869-1927
文摘
Single-element combustor experiments are conducted for three shear coaxial geometry configuration injectors by using gaseous oxygen and gaseous hydrogen (GO2/GH2) as propellants. During the combustion process, several spatially and timeresolved non-intrusive optical techniques, such as OH planar laser induced fluorescence (PLIF), high speed imaging, and infrared imaging, are simultaneously employed to observe the OH radical concentration distribution, flame fluctuations, and temperature fields. The results demonstrate that the turbulent flow phenomenon of non-premixed flame exhibits a remarkable periodicity, and the mixing ratio becomes a crucial factor to influence the combustion flame length. The high speed and infrared images have a consistent temperature field trend. As for the OH-PLIF images, an intuitionistic local flame structure is revealed by single-shot instantaneous images. Furthermore, the means and standard deviations of OH radical intensity are acquired to provide statistical information regarding the flame, which may be helpful for validation of numerical simulations in future. Parameters of structure configurations, such as impinging angle and oxygen post thickness, play an important role in the reaction zone distribution. Based on a successful flame contour extraction method assembled with non-linear anisotropic diffusive filtering and variational level-set, it is possible to implement a fractal analysis to describe the fractal characteristics of the non-premixed flame contour. As a result, the flame front cannot be regarded as a fractal object. However, this turbulent process presents a self-similarity characteristic. Keywords liquid rocket engine shear coaxial injector non-intrusive optical techniques image segmentation fractal analysis