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Characterization of thermodynamic non-equilibrium of plasma flow using coherent anti-Stokes Raman scattering
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Wenbin YANG1, Hualei ZHANG1, 2, Xinhua QI1, *, Qingfeng CHE1, Jiangning ZHOU1, Bing BAI1, 3, Shuang CHEN1, Jinhe MU1
Journal of Experiments in Fluid Mechanics | 2026, 40(3) : 79 - 87
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Journal of Experiments in Fluid Mechanics | 2026, 40(3): 79-87
• Measuring Technique •
Characterization of thermodynamic non-equilibrium of plasma flow using coherent anti-Stokes Raman scattering
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Wenbin YANG1, Hualei ZHANG1, 2, Xinhua QI1, *, Qingfeng CHE1, Jiangning ZHOU1, Bing BAI1, 3, Shuang CHEN1, Jinhe MU1
Affiliations
  • 1Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang　621000, China
  • 2Aviation University of Air Force, Changchun　130012, China
  • 3Key Laboratory of Optoelectronics and Laser Technology, Heilongjiang Institute of Technology, Harbin　150001, China
Published: 2026-06-25 doi: 10.11729/syltlx20240048
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Temperature is considered to be one of the most concerned parameters to quantitatively describe flow characteristics, of which the measurement accuracy directly affects the prediction of aerodynamic, aerothermal and thermal protection performance of hypersonic vehicles. Based on the principles of Coherent Anti-Stokes Raman Scattering (CARS), a CARS spectral computation and vib-rotational temperature inversion program is proposed for characterizing the thermodynamic non-equilibrium properties of the high-temperature gas flow field. And corresponding accuracy from 1000 K to 2300 K is verified in a static environment. A non-equilibrium microwave plasma flow is built and its vibrational temperature and rotational temperature with different pressures, N2 volumetric flow rate, and compositions are obtained by using the developed program. The results show that within the range of experimental conditions, with pressure increasing, the vibrational temperature and rotational temperature decrease, while the thermodynamic non-equilibrium degree increases but corresponding increase rate decreases. With N2 volumetric flow rate increasing, the vibrational temperature and rotational temperature first increase and then decrease, while the thermodynamic non-equilibrium degree exhibits an opposite trend. With Ar volume fraction increasing, the vibrational temperature first increases and then decreases, and the rotational temperature increases, while the thermodynamic non-equilibrium degree decreases.

coherent anti-Stokes Raman scattering  /  thermodynamic non-equilibrium  /  plasma flow  /  vibrational temperature  /  rotational temperature
Wenbin YANG, Hualei ZHANG, Xinhua QI, Qingfeng CHE, Jiangning ZHOU, Bing BAI, Shuang CHEN, Jinhe MU. Characterization of thermodynamic non-equilibrium of plasma flow using coherent anti-Stokes Raman scattering[J]. Journal of Experiments in Fluid Mechanics, 2026 , 40 (3) : 79 -87 . DOI: 10.11729/syltlx20240048
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Year 2026 volume 40 Issue 3
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Article Info
doi: 10.11729/syltlx20240048
  • Receive Date：2024-08-06
  • Online Date：2026-09-02
  • Published：2026-06-25
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History
  • Received：2024-08-06
  • Revised：2024-10-21
  • Accepted：2024-10-24
Affiliations
    1Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang　621000, China
    2Aviation University of Air Force, Changchun　130012, China
    3Key Laboratory of Optoelectronics and Laser Technology, Heilongjiang Institute of Technology, Harbin　150001, China
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表12种不同金属材料的力学参数
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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