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During the flight in the atmosphere, the optical window of an optical dome needs to be cooled, and supersonic film cooling is one of the economic ways. After traversing through the complex flow field above the window, the optical wave would be distorted by fluctuations in the density field due to the expansion wave, shockwave, mixing layer, turbulent boundary layer, etc. The aero-optical aberrations induced by the flow field of an optical dome in the presence and in the absence of the gas injection at Mach 3.8 are investigated experimentally. Based on the nano-tracer planar laser scattering (NPLS) technique, the density field with high spatial-temporal resolution is first obtained by the flow image calibration, and then the optical path difference (OPD)fluctuations of the original 532 nm planar wavefront perpendicular to the window are calculated using Ray-tracing theory. Also the OPD fluctuations caused by the near-wall region flow structures are presented. In the absence of the gas injection, the flow structure is relatively simple with a long recirculation and laminar region, while in the presence of the gas injection, there appear more complex structures such as shear layer, mixing layer and turbulent boundary layer and the flow is converted into turbulence quickly. Clearly, the optical aberration in the presence of the gas injection is degraded more. For example, the values of root-mean-square OPD (OPDrms) in the absence of the gas injection are 0.038 μm and 0.0356 μm, and they are 0.0462 μm, and 0.0485 μm in the presence of the gas injection during the interval 5 μs.
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Keywords:
- supersonic /
- injection /
- aero-optics /
- optical path difference
[1] Sun J, Liu W Q 2012 Acta Phys. Sin. 61 124401 (in Chinese) [孙建, 刘伟强 2012 61 124401]
[2] Jumper E J, Fitzgerald E J 2001 Prog. Aerospace Sci. 37 299
[3] Liu Y Y, L Q B, Zhang W X 2012 Acta Phys. Sin. 61 124201 (in Chinese) [刘扬阳, 吕群波, 张文喜 2012 61 124201]
[4] Ji X L 2010 Acta Phys. Sin. 59 692 (in Chinese) [季小玲 2010 59 692]
[5] He X M, L B D 2012 Acta Phys. Sin. 61 054201 (in Chinese) [何雪梅, 吕百达 2012 61 054201]
[6] Chen X W, Ji X L 2009 Acta Phys. Sin. 58 2435 (in Chinese) [陈晓文, 季小玲 2009 58 2435]
[7] Wei H Y, Wu Z S, Peng H 2008 Acta Phys. Sin. 57 6666 (in Chinese) [韦宏艳, 吴振森, 彭辉 2008 57 6666]
[8] Li G C 2006 Aero-Optics (Beijing:National Defense Industry Press) (in Chinese) [李桂春 2006 气动光学 (北京:国防工业出版社)]
[9] Klein M V 1970 Optics (New York:John Wiley and Sons)
[10] Jumper E J 1997 AIAA Paper 1997-2350
[11] Sutton G W 1985 AIAA J. 23 1525
[12] Yi S H, Tian L F, Zhao Y X, He L, Chen Z 2010 Chin. Sci. Bull. 55 3545
[13] Tian L F, Zhao Y X, He L, Chen Z 2011 Chin. Sci. Bull. 56 2320
[14] Zhao Y X, Yi S H, Tian L F, He L, Cheng Z Y 2010 Sci. China G 53 81
[15] Gao Q, Jiang Z F, Yi S H, Zhao Y X 2010 Appl. Opt. 49 3786
[16] Gao Q, Yi S H, Jiang Z F, Zhao Y X, Xie W K 2012 Chin. Phys. B 21 064701
[17] Sutton G W, Pond J E, Snow R, Hwang Y 1993 AIAA Paper 93-2675
[18] Tian L F, Yi S H, Zhao Y X, He L, Cheng Z Y 2009 J. Experim. Fluids Mech. 23 15 (in Chinese) [田立丰, 易仕和, 赵玉新, 何霖, 程忠宇 2009 实验流体力学 23 15]
[19] Zhao Y X, Yi S H, Tian L F, Cheng Z Y 2009 Sci. China E 52 3640
[20] Zhao Y X, Yi S H, He L, Cheng Z Y, Tian L F 2007 Chin. Sci. Bull. 52 1297
[21] Zhao Y X, Yi S H, He L, Cheng Z Y, Tian L F 2007 J. National Univ. Technol. 29 12 (in Chinese) [赵玉新, 易仕和, 何霖, 程忠宇, 田立丰 2007 国防科技大学学报 29 12]
[22] Zhao Y X, Yi S H, Tian L F, He L, Cheng Z Y 2008 Sci. China G 51 1134
[23] Yi S H, He L, Zhao Y X, Tian L F, Cheng Z Y 2009 Sci. China G 52 2001
[24] He L, Yi S H, Zhao Y X, Tian L F, Chen Z 2011 Chin. Sci. Bull. 56 489
[25] Hornak J P 2002 Encyclopedia of Imaging Science and Technology (New York:John Wiley and Sons) pp390-420
[26] Tian L F, Yi S H, Zhao Y X, He L, Cheng Z Y 2009 Sci. China G 52 1357
[27] Yin X L 2003 Aero-optical Mechanism (Beijing:China Astronautics Press) p186 (in Chinese) [殷兴良 2003 气动光学原理 (北京:中国宇航出版社) p186]
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[1] Sun J, Liu W Q 2012 Acta Phys. Sin. 61 124401 (in Chinese) [孙建, 刘伟强 2012 61 124401]
[2] Jumper E J, Fitzgerald E J 2001 Prog. Aerospace Sci. 37 299
[3] Liu Y Y, L Q B, Zhang W X 2012 Acta Phys. Sin. 61 124201 (in Chinese) [刘扬阳, 吕群波, 张文喜 2012 61 124201]
[4] Ji X L 2010 Acta Phys. Sin. 59 692 (in Chinese) [季小玲 2010 59 692]
[5] He X M, L B D 2012 Acta Phys. Sin. 61 054201 (in Chinese) [何雪梅, 吕百达 2012 61 054201]
[6] Chen X W, Ji X L 2009 Acta Phys. Sin. 58 2435 (in Chinese) [陈晓文, 季小玲 2009 58 2435]
[7] Wei H Y, Wu Z S, Peng H 2008 Acta Phys. Sin. 57 6666 (in Chinese) [韦宏艳, 吴振森, 彭辉 2008 57 6666]
[8] Li G C 2006 Aero-Optics (Beijing:National Defense Industry Press) (in Chinese) [李桂春 2006 气动光学 (北京:国防工业出版社)]
[9] Klein M V 1970 Optics (New York:John Wiley and Sons)
[10] Jumper E J 1997 AIAA Paper 1997-2350
[11] Sutton G W 1985 AIAA J. 23 1525
[12] Yi S H, Tian L F, Zhao Y X, He L, Chen Z 2010 Chin. Sci. Bull. 55 3545
[13] Tian L F, Zhao Y X, He L, Chen Z 2011 Chin. Sci. Bull. 56 2320
[14] Zhao Y X, Yi S H, Tian L F, He L, Cheng Z Y 2010 Sci. China G 53 81
[15] Gao Q, Jiang Z F, Yi S H, Zhao Y X 2010 Appl. Opt. 49 3786
[16] Gao Q, Yi S H, Jiang Z F, Zhao Y X, Xie W K 2012 Chin. Phys. B 21 064701
[17] Sutton G W, Pond J E, Snow R, Hwang Y 1993 AIAA Paper 93-2675
[18] Tian L F, Yi S H, Zhao Y X, He L, Cheng Z Y 2009 J. Experim. Fluids Mech. 23 15 (in Chinese) [田立丰, 易仕和, 赵玉新, 何霖, 程忠宇 2009 实验流体力学 23 15]
[19] Zhao Y X, Yi S H, Tian L F, Cheng Z Y 2009 Sci. China E 52 3640
[20] Zhao Y X, Yi S H, He L, Cheng Z Y, Tian L F 2007 Chin. Sci. Bull. 52 1297
[21] Zhao Y X, Yi S H, He L, Cheng Z Y, Tian L F 2007 J. National Univ. Technol. 29 12 (in Chinese) [赵玉新, 易仕和, 何霖, 程忠宇, 田立丰 2007 国防科技大学学报 29 12]
[22] Zhao Y X, Yi S H, Tian L F, He L, Cheng Z Y 2008 Sci. China G 51 1134
[23] Yi S H, He L, Zhao Y X, Tian L F, Cheng Z Y 2009 Sci. China G 52 2001
[24] He L, Yi S H, Zhao Y X, Tian L F, Chen Z 2011 Chin. Sci. Bull. 56 489
[25] Hornak J P 2002 Encyclopedia of Imaging Science and Technology (New York:John Wiley and Sons) pp390-420
[26] Tian L F, Yi S H, Zhao Y X, He L, Cheng Z Y 2009 Sci. China G 52 1357
[27] Yin X L 2003 Aero-optical Mechanism (Beijing:China Astronautics Press) p186 (in Chinese) [殷兴良 2003 气动光学原理 (北京:中国宇航出版社) p186]
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