|
|
|
|
|
|
Preliminary Study on Atom N in High-Enthalpy Flow Field |
LUO Jie,MA Hao-jun*,WANG Guo-lin,XIAO Xue-ren |
Hypervelocity Aerodynamics Institute of China Aerodynamics Research and Development Center,Mianyang 621000,China |
|
|
Abstract When the hypersonic vehicle re-enters the atmosphere, it is subjected to the compression of the shock wave and the viscous blocking effect in the shock layer. The air temperature in the surrounding flow field is between 4 000~15 000 K, which causes oxygen and nitrogen molecules in the air to dissociate, resulting in high-temperature gas effect and the formation of high enthalpy chemical nonequilibrium flow. There are a large number of carbon elements in thermal protection materials on the surface of aircraft. Generally, the reaction between oxygen and carbon is the main reaction at high enthalpy. But when the enthalpy is greater than 18 mJ·kg-1,the dimensionless mass ablation factor for the reaction of nitrogen atoms with carbon on the aircraft surface is BCN>0.172 5,and at the time, the dimensionless mass ablation factor of carbon in high enthalpy air is BCair>0.345; as a result, the nitriding ablation of carbon becomes very intense, which is equivalent to the oxidation ablation. Meanwhile, the dissociated nitrogen atoms also produce a large amount of heat in the catalytic reaction on the surface of the aircraft, which makes the aircraft surface withstand more thermodynamic impact. Therefore, the analysis of nitrogen atoms in high enthalpy chemical nonequilibrium flow field is of great practical significance. A high enthalpy chemical nonequilibrium flow field is established in ground simulation equipment, and nitrogen atoms can be well studied by measurement. Two-photon absorption laser-induced fluorescence (TALIF) technology, as a non-contact measurement, can directly obtain the concentration distribution without disturbing the flow field. Nitrogen atoms in the flow field are excited by a pulse laser, and two-dimensional nitrogen atom fluorescence signals are obtained through ICCD arranged outside a wind tunnel test section in a direction perpendicular to a plane formed by the flow field and the laser. In order to ensure the fluorescence image is clear and the field of view is appropriate, the Nikon f=50 mm F/1.4 lens is selected as the front stage light receiving device. Experimental imaging is the cumulative result of 50 exposures to eliminate the uncertainty caused by turbulence and laser energy jitter. By testing around the theoretical excitation wavelength, 206.717 nm is optimized as the best excitation wavelength in the formal experiment. At the condition of the optimal laser wavelength, the laser energy is adjusted from small to large, and the unsaturated linear region for the nitrogen atom in this environment is less than 1.8 mJ. In the formal experiment, the laser energy is 1.6 mJ, which is in the linear region. Based on the analysis of the fluorescence intensity extracted along the laser centerline obtained from the fluorescence image, it was found that both the subsonic flow and the supersonic flow presented a hump-shaped distribution along the radial direction. Compared with the previous work of oxygen atoms, it was found that the nitrogen molecules in the flow field had not been completely dissociated, which was consistent with the flow field characteristics of the experimental wind tunnel.
|
Received: 2020-06-10
Accepted: 2020-10-24
|
|
Corresponding Authors:
MA Hao-jun
E-mail: mahaojun82@163.com
|
|
[1] Von Karman T. From Low Speed Aerodynamics to Astronautics. Oxford: Pergamon Press, 1963.
[2] Anderson, John D Jr. Hypersonic and High temperature Gas Dynamics. New York: McGraw-Hill Book Company, 1988.
[3] ZHANG Zhi-cheng, PAN Mei-lin, LIU Chu-ping(张志成,潘梅林,刘初平). Hypersonic Aerodynamic Thermal and Thermal Protection(高超声速气动热和热防护). Beijing: National Defense Industry Press(北京:国防工业出版社),2003.
[4] LE Jia-ling, GAO Tie-suo, ZENG Xue-jun(乐嘉陵,高铁锁,曾学军). Reentry Physics(再入物理). Beijing: National Defense Industry Press(北京:国防工业出版社),2005.
[5] Nathan D Jerred, Spencer Cooley, Robert C, et al. AIAA Conference, 2012,5152.
[6] Tomoaki Ishihara, Keisuke Sawada, Yousuke Ogino. AIAA Conference,2012,0285.
[7] Meyers J M, Fletcher D G. 46th AIAA Plasma Dynamics and Lasers Conference, 2015, 2015.
[8] LUO Jie, JIANG Gang, WANG Guo-lin, et al(罗 杰,蒋 刚,王国林,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2017, 37(2): 481.
[9] LUO Jie, JIANG Gang, WANG Guo-lin, et al(罗 杰,蒋 刚,王国林,等). Journal of Experiments in Fluid Mechanics(实验流体力学),2017, 41(1): 67.
[10] Klochko A V, Lemainque J, Booth J P, et al. Plasma Sources Sci. Technol., 2015,24:025010.
[11] Reuter S, Niemi K, Gathen V, et al. Plasma Sources Science Technology, 2009, 18(1): 015006.
[12] Stefan Lohle, Christoph Eichhorn, Georg Herdrich. 41st AIAA Thermophysics Conference, 2009,4242.
[13] Ciprian Dumitrache, Arnaud Gallant, Gabi-Daniel Stancu, et al. AIAA Scitech 2019 Forum, 10.2514/6.2019-1507.
[14] Johansen C, Lincoln D, Bathel B, et al. 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 2014,400. |
[1] |
QI Guo-min1, TONG Shi-qian1, LIN Xu-cong1, 2*. Specific Identification of Microcystin-LR by Aptamer-Functionalized Magnetic Nanoprobe With Laser-Induced Fluorescence[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3813-3819. |
[2] |
KONG De-ming1, LIU Ya-ru1, DU Ya-xin2, CUI Yao-yao2. Oil Film Thickness Detection Based on IRF-IVSO Wavelength Optimization Combined With LIF Technology[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(09): 2811-2817. |
[3] |
WANG Shu-ying*, YOU De-chang, MA Wen-jia, YANG Ruo-fan, ZHANG Yang-zhi, YU Zi-lei, ZHAO Xiao-fang, SHEN Yi-fan. Experimental Collisional Energy Transfer Distributions for Collisions of CO2 With Highly Vibrationally Excited Na2[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(06): 1760-1764. |
[4] |
YUAN Li1, KONG De-ming2*, CHEN Ji-liang3, ZHONG Mei-yu3, ZHANG Xiao-dan3, XIE Bei-bei3, KONG Ling-fu3. Study on an Equivalent Estimation Method of Oil Spill of Water in Oil
Emulsion[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(02): 342-347. |
[5] |
ZHANG Xiao-dan1, KONG De-ming2*, ZHONG Mei-yu1, MA Qin-yong1, KONG Ling-fu1. Research on an Equivalent Evaluation Algorithm for the Oil Spill Volume of Oil-in-Water Emulsion on the Sea Surface[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(12): 3665-3671. |
[6] |
YAN Peng-cheng1, 2, ZHANG Xiao-fei2*, SHANG Song-hang2, ZHANG Chao-yin2. Research on Mine Water Inrush Identification Based on LIF and
LSTM Neural Network[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(10): 3091-3096. |
[7] |
CHEN Si-ying1, JIA Yi-wen1, JIANG Yu-rong1*, CHEN He1, YANG Wen-hui2, LUO Yu-peng1, LI Zhong-shi1, ZHANG Yin-chao1, GUO Pan1. Classification and Recognition of Adulterated Manuka Honey by
Multi-Wavelength Laser-Induced Fluorescence[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(09): 2807-2812. |
[8] |
YUAN Li1, XIE Bei-bei2, CUI Yong-qiang2, ZHANG Xiao-dan2, JIAO Hui-hui2. Research on Oil Spill Status Recognition Based on LIF[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(07): 2018-2024. |
[9] |
YAN Peng-cheng1, 2, ZHANG Chao-yin2*, SUN Quan-sheng2, SHANG Song-hang2, YIN Ni-ni1, ZHANG Xiao-fei2. LIF Technology and ELM Algorithm Power Transformer Fault Diagnosis Research[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(05): 1459-1464. |
[10] |
WU Jie1, LI Chuang-kai1, CHEN Wen-jun1, HUANG Yan-xin1, ZHAO Nan1, LI Jia-ming1, 2*, YANG Huan3, LI Xiang-you4, LÜ Qi-tao3,5, ZHANG Qing-mao1,2,5. Multiple Liner Regression for Improving the Accuracy of Laser-Induced Breakdown Spectroscopy Assisted With Laser-Induced Fluorescence (LIBS-LIF)[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(03): 795-801. |
[11] |
LI Jun1, 4, KONG De-ming2*, ZHANG Xiao-dan1, MA Qin-yong1, KONG De-han3, KONG Ling-fu1. Simulation Research on Detection of Emulsified Oil Spill on Sea Surface Based on LIF System With Coaxial Transceiver[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(02): 592-597. |
[12] |
CUI Yong-qiang1, KONG De-ming2*, MA Qin-yong1, XIE Bei-bei1, ZHANG Xiao-dan1, KONG De-han3, KONG Ling-fu1. Algorithm Research on Inversion Thickness of Oil Spill on the Sea Surface Using Raman Scattering and Fluorescence Signal[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(01): 104-109. |
[13] |
ZHANG Xiao-dan1, KONG De-ming2*, YUAN Li1, KONG De-han3, KONG Ling-fu1. BRRDF Simulation Research on Multiple Detection Parameters of Water-in-Oil Emulsion of Oil Spill on the Sea Surface[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(12): 3797-3801. |
[14] |
LIU Yu1, LI Zeng-wei2, DENG Zhi-peng1, ZHANG Qing-xian1*, ZOU Li-kou2*. Fast Detection of Foodborne Pathogenic Bacteria by Laser-Induced Fluorescence Spectrometry[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(09): 2817-2822. |
[15] |
WANG Yi-hui1, 2, HU Ren-zhi2*, XIE Pin-hua2, 3, 4*, WANG Feng-yang1, 2, ZHANG Guo-xian1, 2, LIN Chuan1, 2, LIU Xiao-yan5, WANG Yue2. The Study of Turbulent Calibration System of HOx Radical Detection[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(08): 2384-2390. |
|
|
|
|