To obtain the flow field velocity of an engine with high dependability at extreme combustion condition
the velocity of gas flow field was measured by using Fabry-Perot etalon to detect the Doppler frequency shift of molecular scattering. The working principle of a multi-point interferometric Rayleigh scattering velocimeter was introduced
and the correlation between collecting direction of scattering light and the direction of measured velocity component was analyzed. Then
an orthogonal two-component multi-point velocity measurement system was set up. Based on the measured interference fringe image
the center of interference fringe was measured by template match
the Doppler frequency shift of Rayleigh scattering was obtained through a fitting spectrum curve by with Levenberg-Marquarat algorithm and the corres ponding velocity was calculated. The orthogonal two-components with a Mach air flow of 1.5 were obtained at an
x
-
y
plane
and the multi-point velocity vector graph in the
x-y
plane was given. The research results show that this velocity measurement system can simultaneously measure the orthogonal two-component velocities with high dependability.
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references
胡志云,刘晶儒,关小伟,等 .燃烧场参数的激光诊断技术研究[J]. 强激光与粒子束, 2002,14(5): 702-706. HU ZH Y, LIU J R, GUAN X W, et al.. Study on laser diagnostics applied to combustion and flame[J]. High Power Laser and Particle Beams, 2002,14(5): 702-706. (in Chinese)
刘晶儒,胡志云,张振荣,等 .激光光谱技术在燃烧流场诊断中的应用[J]. 光学 精密工程, 2011, 19(2):284-296. LIU J R, HU ZH Y, ZHANG ZH R, et al.. Laser spectroscopy applied to combustion diagnostics[J].Opt. Precision Eng., 2011, 19(2):284-296. (in Chinese)
张志荣, 夏滑, 董凤忠,等 .利用可调谐半导体激光吸收光谱法同时在线监测多组分气体浓度[J]. 光学 精密工程, 2013, 21(11):2771-2777. ZHANG ZH R, XIA H, DONG F ZH, et al.. Simultaneous and on-line detection of multiple gas concentration with tunable diode laser absorption spectroscopy[J].Opt. Precision Eng., 2013, 21(11):2771-2777. (in Chinese)
MOORE D S, SCHMIDT S C, SHAW M S. Coherent anti-Stokes Raman spectroscopy of shock-compressed liquid nitrogen/argon mixtures[J]. Journal of Chemical Physics, 1994, 101(5):3488-3494.
ADRIAN R J. Particle-imaging techniques for experimental fluid mechanics[J]. Annual Review of Fluid Mechanics, 1991, 23(1):261-304.
SEASHOLTZ R G. Fiber optic coupled Rayleigh scattering diagnostic for point measurement of gas density, velocity and temperature[C]. 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 1998.
BIVOLARU D, DANEHY P M, GRINSTEAD K D, et al.. Simultaneous CARS and interferometric Rayleigh scattering[C]. 25th AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 2006.
TENTI G, BOLEY C D, DESAI R C. On the kinetic model description of Rayleigh-Brillouin scattering from molecular gases[J]. Canadian Journal of Physics, 1974, 52(4):285-290.
RAMSEY M C, PITZ R W. Template matching for improved accuracy in molecular tagging velocimetry[J]. Exp. Fluids, 2011,51:811-819.
王晟,胡志云,张振荣,等. 阻尼最小二乘算法CARS光谱温度拟合[J]. 强激光与粒子束, 2012, 24(11) :2565-2570. WANG SH, HU ZH Y, ZHANG ZH R, et al.. Temperature estimation of coherent anti-stokes Raman scattering spectra using Levenberg-Marquarat algorithm[J]. High Power Laser and Particle Beams, 2012, 24(11) :2565-2570. (in Chinese)
侯俊峰,王东光,邓元勇,等 .斯托克斯椭偏仪的非线性最小二乘拟合偏振定标[J]. 光学 精密工程, 2013, 21(8):1915-1922. HOU J F, WANG D G, DENG Y Y, et al.. Nonlinear least-square fitting polarization calibration of Stokes ellipsometer[J].Opt. Precision Eng., 2013, 21(8): 1915-1922. (in Chinese)