Dr. Shuang-yan Shen Profile

Dr. Shuang-yan Shen

at State Key Laboratory of Laser Propulsion & Applica

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Proceedings Article | 25 October 2016 Paper

Corona discharge spectrum measurement and nitrogen molecular vibrational temperature calculation

Shuang-yan Shen, Xing Jin, Peng Zhang, Tong-ye Deng

Proceedings Volume 10157, 101571Z (2016) https://doi.org/10.1117/12.2246723

KEYWORDS: Temperature metrology, Nitrogen, Plasma

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Plasma enhanced ignition is an important way in the field of ignition auxiliary. It has got wide attention throughout the researchers both at home and abroad. Emission spectrum analysis is an important non-contact measurement method and could be used to analyze the parameters of the plasma. The coaxial corona discharge device was built and the emission spectrum was measured and analyzed. The physical model was constructed to calculate the vibrational temperature of nitrogen molecular. The results of the experiment and calculation results show that the emission spectrum of corona discharge is mainly second positive band system of nitrogen molecule. It is produced by the transition of the N₂(C³Π_u) and N₂(B³Π_u) which is the strongest and the most stable N₂ emission spectrum. Ignore the emission spectrum of single line with no line width. The emission spectrum is mainly the N₂(C-B,0-0), N₂(C-B,1-3), N₂(C-B,0-2), N₂(C-B,1-4), N₂(C-B,0-3) transition spectrum. The emission spectrum line of O₂ is not obvious in the air corona discharge emission spectrum. The vibration temperature of nitrogen molecules was calculated according to the second positive band. The vibrational temperature of nitrogen molecules is 6193.21K, 3076.46K, 2788.61K at the discharge power of 1.325W, 4.272W, 8.4W. It laid a foundation of plasma enhance ignition for the further research.

Proceedings Article | 25 October 2016 Paper

The influence of the intensity of electric field on methane-air mixed gas discharge electron transport parameters

Shuang-yan Shen, Xing Jin, Peng Zhang

Proceedings Volume 10157, 1015711 (2016) https://doi.org/10.1117/12.2245409

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Plasma enhanced ignition is an important way in the field of ignition auxiliary. It has got wide attention throughout the researchers both at home and abroad. The plasma is usually added in the form of discharge. It makes a big difference in the discharge form according to different discharge unit, different kinds of electric field and different kinds of discharge medium. Variety of methods could be used to characterize the parameters of the plasma. The electron transport parameter is an important variable during the process of the plasma discharge. The mathematical model was set up to calculate the electron transport parameters in different reduced electric intensity. The electrons meet the Boltzmann equations in plasma system. Reasonable methods were used to simplify the Boltzmann equations. The electron transport parameters of methane-air mixed gas at the same equivalent ratio and pressure in different reduced electric field were calculated. The calculation results show that the EEDF turns to the right with the increasing of reduced electric field. The average electron energy and average electron energy of the mixed gas increases linearly with the increasing of reduced electric field. The increasing of reduced electric field enhances the electronic/energy diffusion effect and the enhancing effect is more apparent when the reduced electric field is high. The increasing of reduced electric field restrains the electron diffusion and energy transference restrains from the trend of the change. The inhibition effect is weakening with the increasing of the reduced electric field.

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