激发跃迁速率对热力学非平衡氮气紫外辐射的影响
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摘要
基于氮气的碰撞-辐射(CR)模型,计算了速度为6.2km/s、初始压力为133Pa的高超声速流动激波中N_2和N_2~+分子电子能级的分布情况,分析了不同激发跃迁速率模型对电子能级分布及辐射光谱模拟的影响。针对流动中热力学非平衡区域和平衡区域,在300～440nm的辐射光谱开展了逐线法的数值模拟,并与激波管实验测量光谱进行了对比。结果表明,目前的激发跃迁速率均存在偏差,综合Park模型的爱因斯坦系数和Johnston模型的碰撞激发速率可以得到与实验结果最为接近的辐射光谱。
Based on the collision-radiation(CR) model of nitrogen,the distribution of the electronic energy levels of N_2 and N_2~+ molecules in the hypersonic flow shock wave with velocity 6.2 km/s and initial pressure 133 Pa is calculated. The effects of different excitation and transition rate models on the electronic energy level distribution and the radiation spectrum simulation are analyzed. A line-by-line method is carried out to simulate the radiation spectrum of the thermal nonequilibrium region and the equilibrium region in the 300-440 nm,which are compared with the experimental measurement spectra of the shock tube. It is found that the current excitation and transition rates all have deviations,and the CR model that integrated the Einstein coefficient of Park model and the collision excitation rate of the Johnston model can gain the radiation spectrum which is the closest to the experimental results.
Based on the collision-radiation(CR) model of nitrogen,the distribution of the electronic energy levels of N_2 and N_2~+ molecules in the hypersonic flow shock wave with velocity 6.2 km/s and initial pressure 133 Pa is calculated. The effects of different excitation and transition rate models on the electronic energy level distribution and the radiation spectrum simulation are analyzed. A line-by-line method is carried out to simulate the radiation spectrum of the thermal nonequilibrium region and the equilibrium region in the 300-440 nm,which are compared with the experimental measurement spectra of the shock tube. It is found that the current excitation and transition rates all have deviations,and the CR model that integrated the Einstein coefficient of Park model and the collision excitation rate of the Johnston model can gain the radiation spectrum which is the closest to the experimental results.
引文
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[16]吴杰,董雁冰.热力学非平衡分子辐射中的重粒子影响[J].红外与激光工程,2012,41(11):2981-2985.WU J,DONG Y B.Impact of heavy particles in radiation from thermally nonequilibrium molecules[J].Infrared and Laser Engineering,2012,41(11):2981-2985(in Chinese).
[17]ARNOLD J O,WHITING E E,LYLE G C.Line-by-line calculation of spectra from diatomic molecules and atoms assuming a voigt line profile[J].Journal of Quantitative Spectroscopy and Radiative Transfer,1969,9(6):775-798.
[2]PARK C,HOWE J T,JAFFE R L,et al.Review of chemical-kinetic problems of future NASA missions,Ⅱ:Mars entries[J].Journal of Thermophysics and Heat Transfer,1994,8(1):9-23.
[3]ANNALORO J,BULTEL A,OMALY P.Elaboration of a collisional-rediative model for CO2-N2-Ar plasma flows:Appliction to atmospheric Martian entries[C]∥42nd AIAA Thermophysics Conference.Reston:AIAA,2011:3954.
[4]CRUDEN B A,PRABHU D,MARTINEZ R,et al.Absolute radiation measurement in Venus and Mars entry conditions[C]∥10th AIAA/ASME Joint Thermophysics and Heat Transfer Conference.Reston:AIAA,2010:092407.
[5]LAUX C O,PIERROT L,GESSMAN R J.State-to-state modeling of a recombining nitrogen plasma experiment[J].Chemical Physics,2012,398(1):46-55.
[6]PARK C.Calculation of nonequilibrium radiation in the flight regimes of aeroassisted orbital transfer vehicles[C]∥AIAA22nd Aerospace Sciences Meeting.Reston:AIAA,1984:1-13.
[7]LEMAL A,JACOBS C M,PERRIN M Y,et al.Simulation of shock tube radiation measurements with a collisional-radiaitve model[C]∥51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aeroespace Exposition.Reston:AIAA,2013:1-9.
[8]LEE E S,PARK C,CHANG K S.Shock-tube determination of CN formation rate in a CO-N2mixture[C]∥45th AIAA Aerospace Sciences Meeting and Exhibit.Reston:AIAA,2007:1-13.
[9]PANESI M,MAGIN T E,BOURDON A,et al.Analysis of the FIREⅡflight experiment by means of a collisional radiative model[C]∥46th AIAA Aerospace Sciences Meeting and Exhibit.Reston:AIAA,2008:1-15.
[10]SHARMA S P,GILLESPIE W.Nonequilibirum and equilibrium shock front radiation measurements[J].Journal of Thermophysics and Heat Transfer,1991,5(3):257-265.
[11]PARK C.Nonequilibrium hypersonic aerothermodynamics[M].New York:Wiley,1989.
[12]PARK C.Rate parameters for electronic excitation of diatomic MoleculesⅠ.Electron-impact processes[C]∥46th AIAA Aerospace Sciences Meeting and Exhibit,Aerospace Sciences Meetings.Reston:AIAA,2008:1206.
[13]PARK C.Rate parameters for electronic excitation of diatomic MoleculesⅡ.Heavy particle-impact processes[C]∥46th AIAA Aerospace Sciences Meeting and Exhibit,Aerospace Sciences Meetings.Reston:AIAA,2008:1446.
[14]TEULET P,SARRETTE J P,GOMES A M.Calculation of electron impact inelastic cross sections and rate coefficients for diatomic molecules.application to air molecules[J].Journal of Quantitative Spectroscopy and Radiative Transfer,1999,62(5):549-569.
[15]JOHNSTON C O.Nonequilibrium shock-layer radiative heating for earth and titan entry[D].Blacksburg:Virginia Polytechnic Institute and State University,2006:116-126.
[16]吴杰,董雁冰.热力学非平衡分子辐射中的重粒子影响[J].红外与激光工程,2012,41(11):2981-2985.WU J,DONG Y B.Impact of heavy particles in radiation from thermally nonequilibrium molecules[J].Infrared and Laser Engineering,2012,41(11):2981-2985(in Chinese).
[17]ARNOLD J O,WHITING E E,LYLE G C.Line-by-line calculation of spectra from diatomic molecules and atoms assuming a voigt line profile[J].Journal of Quantitative Spectroscopy and Radiative Transfer,1969,9(6):775-798.