Research progress on soot measurement by laser induced incandescence

Liu Fushui; Hua Yang; Wu Han; Gao Yongli; Wu Hao

doi:10.11729/syltlx20160104

Volume 31 Issue 1

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Liu Fushui, Hua Yang, Wu Han, et al. Research progress on soot measurement by laser induced incandescence[J]. Journal of Experiments in Fluid Mechanics, 2017, 31(1): 1-12. doi: 10.11729/syltlx20160104

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Research progress on soot measurement by laser induced incandescence

doi: 10.11729/syltlx20160104

School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

Received Date: 2016-06-27
Rev Recd Date: 2016-08-05
Publish Date: 2017-02-25

Abstract

Abstract

Laser induced incandescence is a non-contact optical diagnosis method. With this method, we can obtain the two-dimensional spatial distribution of instantaneous soot within the thin layer of incoming sheet laser. This method has become an important measurement technology of soot due to its high spatial and temporal resolution. This paper first introduces the development of LⅡ technology and basic theory. Then the technical methods of LⅡ and research progress at home and abroad are summarized detailedly from three aspects, that numerical simulation, qualitative and quantitative measurement. The LⅡ mathematical model mainly includes Melton model, Liu model and Michelsen model. These models can be used to predict the change rule of LⅡ signal and also lay a foundation for the test of soot particle size. To realize quantitative measurement, the calibration of LⅡ signal is necessary. This is also one of the difficulties in LⅡ measurement. There are mainly three methods for calibration, that are sampling technique, light extinction method (LEM) and 2-color laser induced incandescence (2C-LⅡ). The sampling technique is less used because it will disturb the combustion process and mix impurities. The LⅡ-LEM needs two laser systems and uses the measuring result of LEM to calibrate the LⅡ signal, so its operation is complicated. Nevertheless, 2C-LⅡ does not need other measurement technology and can realize online real-time calibration. Since this method is relatively simple, it develops rapidly and has achieved many significant results. Naturally, LⅡ technology still needs improvement, such as optimizing the incident laser wavelength and energy, controlling the uniformity of laser sheet, perfecting the LⅡ mathematical model, and extending the application in complex environment. Through summarizing the research achievements of LⅡ technology, this paper aims to emphasize the research status and the importance of this method in understanding the soot formation and oxidation mechanism, and providing some references for its future development.
- laser induced incandescence,
- soot,
- quantitative measurement,
- optical diagnosis,
- research progress

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References(59)

References

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