Focused laser differential interferometry measurement of instability wave in a hypersonic boundary-layer

Yu Tao; Zhang Wei; Zhang Yifeng; Chen jiufen; Chen Jianqiang; Wu Jie

doi:10.11729/syltlx20190076

Volume 33 Issue 5

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Article Navigation > Journal of Experiments in Fluid Mechanics > 2019 > 33(5): 70-75

Yu Tao, Zhang Wei, Zhang Yifeng, et al. Focused laser differential interferometry measurement of instability wave in a hypersonic boundary-layer[J]. Journal of Experiments in Fluid Mechanics, 2019, 33(5): 70-75. doi: 10.11729/syltlx20190076

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Focused laser differential interferometry measurement of instability wave in a hypersonic boundary-layer

doi: 10.11729/syltlx20190076

1.
School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2.
School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
3.
China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China

Received Date: 2019-05-22
Rev Recd Date: 2019-09-03
Publish Date: 2019-10-25

Abstract

Abstract

The wind tunnel experiment is one of the most important methods to conduct the hypersonic boundary-layer transition research. However, the experimental technology that can be used for three-dimensional hypersonic boundary-layer measurement is still extremely lacking, and the dynamic response of the existing measurement technology is quite restricted. In order to solve the above problems, a non-instrusive Focused Laser Differential Interferometry (FLDI) measurement system is set up based on the light refraction and interference principle and it can effectively measure the density disturbance of the flow field at spatial points. A hypersonic laminar/turbulent boundary-layer transition experiment was carried out on a 7° half angle sharp cone model in a conventional Mach 8 hypersonic wind tunnel with FLDI being the main diagnostic. The results show that FLDI successfully captures the second mode instability wave at 327 kHz and its 645 kHz harmonics. In comparison with PCB test results, FLDI has the advantages of high Signal to Noise Ratio, high dynamic response and high spatial resolution (less than 1 mm along the flow direction). Considering its excellent characteristics such as high spatial and temporal resolution, FLDI can be used as a promising diagnostic for the hypersonic boundary-layer transition and receptivity study.

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References

[1]	刘向宏, 赖光伟, 吴杰.高超声速边界层转捩实验综述[J].空气动力学学报, 2018, 36(2):196-211. doi: 10.7638/kqdlxxb-2018.0017 Liu X H, Lai G W, Wu J. Boundary-layer transition experi-ment in hypersonic flow[J]. Acta Aerodynamica Sinica, 2018, 36(2):196-211. doi: 10.7638/kqdlxxb-2018.0017
[2]	Lin T C. Influence of laminar boundary-layer transition on entry vehicle designs[J]. Journal of Spacecraft and Rockets, 2008, 45(2):165-175. doi: 10.2514/1.30047
[3]	Smeets G, George A. Gas-dynamic investigations in a shock tube using a highly sensitive interferometer[R]. No. REPT-14/71, 1973.
[4]	Smeets G. Laser interferometer for high sensitivity measure-ments on transient phase objects[J]. IEEE Transactions on Aerospace and Electronic Systems, 1972, AES-8(2):186-190. doi: 10.1109/TAES.1972.309488
[5]	Smeets G, George A. Laser-differential interferometer applica-tions in gas dynamics[R]. No. REPT-28/73, 1996.
[6]	Smeets G. Flow diagnostics by laser interferometry[J]. IEEE Transactions on Aerospace and Electronic Systems, 1977, AES-13(2):82-90. doi: 10.1109/TAES.1977.308441
[7]	Parziale N J, Shepherd J E, Hornung H G. Differential interferometric measurement of instability at two points in a hypervelocity boundary layer[R]. AIAA-2013-0521, 2013.
[8]	Parziale N J, Shepherd J E, Hornung H G. Differential interferometric measurement of instability in a hypervelocity boundary layer[J]. AIAA Journal, 2013, 51(3):750-754. doi: 10.2514/1.J052013
[9]	Parziale N J, Shepherd J E, Hornung H G. Observations of hypervelocity boundary-layer instability[J]. Journal of Fluid Mechanics, 2015, 781:87-112. doi: 10.1017/jfm.2015.489
[10]	Parziale N J, Shepherd J E, Hornung H G. Free-stream density perturbations in a reflected-shock tunnel[J]. Experiments in Fluids, 2014, 55(2):1665. doi: 10.1007/s00348-014-1665-0
[11]	Parziale N J, Shepherd J E, Hornung H G. Reflected shock tunnel noise measurement by focused differential interferometry[R]. AIAA-2012-3261, 2012.
[12]	Fulghum M R. Turbulence measurements in high-speed wind tunnels using focusing laser differential interferometry[D]. State College: The Pennsylvania State University, 2014.
[13]	Schmidt B E, Shepherd J E. Analysis of focused laser diffe-rential interferometry[J]. Applied optics, 2015, 54(28):8459-8472. doi: 10.1364/AO.54.008459
[14]	Jewell J S, Parziale N J, Lam K L, et al. Disturbance and phase speed measurements for shock tubes and hypersonic boundary-layer instability[R]. AIAA-2016-3112, 2016.
[15]	Settles G S, Fulghum M R. The focusing laser differential interferometer, an instrument for localized turbulence measure-ments in refractive flows[J]. Journal of Fluids Engineering, 2016, 138(10):101402. doi: 10.1115/1.4033960
[16]	Kine S J, McClintock F A. Describing uncertainties in single-sample experiments[J]. Mechanical Engineering, 1953, 75:3-8.
[17]	Beckwith T G, Marangoni R D, Lienhard J H V. Mechanical measurements[M]. Upper Saddle River:Pearson-Prentice Hall, 2007.