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premixed gas will rise rapidly after flowing out from the burner and produce the chemical reaction, resulting in generating a large number of OH radicals. However, the temperature rising process of the premixed gas has not been taken into account in the numerical simulation. On the contrary, it is considered that the gas temperature near the outlet of burner is still in an ideal unheated state. Therefore, the measured OH concentrations are higher than the calcula-

Figure 7. Comparison between experimental data and numerical simulation of peak OH concentration.

The comparison results for the peak concentration under the conditions of different equivalence ratios have also been made, as shown in Figure 7. It can be clearly seen that the experimental results are smaller than the calculated values. The reason has already been analyzed before, so it is no longer mentioned here. Another notable phenomenon is that the measured OH concentration has not reached the maximum under the equivalent ratio of 1.0, but the peak OH concentration occurs in the lean-burn zone under the equivalence ratio of 0.9. The above experimental result indicates that even if the equivalence ratio of the premixed gas is set to 1.0, the fuel molecules still cannot be completely consumed in the actual combustion process. Therefore, we speculate that the OH reaction rate predicted by the simulation may be

In conclusion, this chapter first reviews the developments of planar laser-induced fluorescence and briefly analyzes the existing problems of quantitative PLIF technology. Then, the advantages

higher than the experimental value under the condition of stoichiometric ratio.

tion results in the upstream of reaction zone.

6. Conclusions

102 Laser Technology and its Applications

Zhen Yang1,2,3\*, Xin Yu1,2, Jiangbo Peng1,2 and Jianlong Zhang<sup>3</sup>

\*Address all correspondence to: sailoryz@163.com

1 National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin, China

2 Institute of Opto-Electronics, Harbin Institute of Technology, Harbin, China

3 Institute of Optical Target Simulation and Test Technology, Harbin Institute of Technology, Harbin, China
