| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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In situ measurement on nonuniform velocity distributionin external detonation exhaust flow by analysis ofspectrum features using TDLAS |
| Xiao-Long Huang(黄孝龙), Ning Li(李宁)†, Chun-Sheng Weng(翁春生), and Yang Kang(康杨) |
| National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China |
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Abstract Instantaneous and precise velocity sensing is a critical part of research on detonation mechanism and flow evolution. This paper presents a novel multi-projection tunable diode laser absorption spectroscopy solution, to provide a real-time and reliable measurement of velocity distribution in detonation exhaust flow with obvious nonuniformity. Relations are established between overlapped spectrums along probing beams and Gauss velocity distribution phantom according to the frequency shifts and tiny variations in components of light-of-sight absorbance profiles at low frequencies analyzed by the fast Fourier transform. With simulated optical measurement using H2O feature at 7185.6 cm-1 carried out on a phantom generated using a simulation of two-phase detonation by a two-fluid model, this method demonstrates a satisfying performance on recovery of velocity distribution profiles in supersonic flow even with a noise equivalent absorbance up to 2×10-3. This method is applied to the analysis of rapidly decreasing velocity during a complete working cycle in the external flow field of an air-gasoline detonation tube operating at 25 Hz, and results show the velocity in the core flow field would be much larger than the arithmetic average from traditional tunable diode laser doppler velocimetry. This proposed velocity distribution sensor would reconstruct nonuniform velocity distribution of high-speed flow in low cost and simple operations, which broadens the possibility for applications in research on the formation and propagation of external flow filed of detonation tube.
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Received: 15 July 2021
Revised: 02 October 2021
Accepted manuscript online: 27 October 2021
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PACS:
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47.40.Rs
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(Detonation waves)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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52.70.Kz
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(Optical (ultraviolet, visible, infrared) measurements)
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| Fund: Project supported by the China Scholarship Council (Grant No. 201906845059), the Young Scientists Found of the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20190439), and the Fundamental Research Funds of National Key Laboratory of Transient Physics (Grant No. 6142604200202). |
Corresponding Authors:
Ning Li
E-mail: phoenixkyo@163.com
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Cite this article:
Xiao-Long Huang(黄孝龙), Ning Li(李宁), Chun-Sheng Weng(翁春生), and Yang Kang(康杨) In situ measurement on nonuniform velocity distributionin external detonation exhaust flow by analysis ofspectrum features using TDLAS 2022 Chin. Phys. B 31 014703
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