The temperature field measurement method by using schlieren method for aircraft engine

Yanling Li; Xin Li; Jun Xu; Zechuan Li; Jun Wu

doi:10.1117/12.2549985

12 March 2020 The temperature field measurement method by using schlieren method for aircraft engine

Yanling Li, Xin Li, Jun Xu, Zechuan Li, Jun Wu

Proceedings Volume 11439, 2019 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 114391E (2020) https://doi.org/10.1117/12.2549985
Event: 2019 International Conference on Optical Instruments and Technology, 2019, Beijing, China

Abstract

Aircraft engine is the core power unit in the aircraft, and monitoring the operational status of aircraft engine can improve the safety and economy of the aircraft. The temperature field of aircraft engine tail spray contains effective information such as the degree of fuel combustion inside the combustion chamber, and monitoring its temperature field can be used to evaluate the state of engine operating. The traditional measurement methods for the temperature field of tail spray generally adopts the measurement method of single point thermometer, Laser Induced Fluorescence (LIF), Tunable Diode Laser Absorption Spectroscopy (TDLAS), etc. However, these methods have limitations such as discrete measurement data, complicated application of equipment, and high price. Therefore, in view of the problems existing in the traditional measurement methods, a schlieren method is proposed in this paper. Firstly, the schlieren system images the temperature field to obtain the correct schlieren image. Then the refractive index distribution of the cross section is obtained according to the schlieren image. Finally, the temperature field distribution is calculated according to the refractive index distribution to measure the temperature field. The schlieren measurement method, a non-contact, highprecision measurement method, which does not require a special laser transceiver device, can be effectively applied to the measurement of the temperature field of the aircraft engine tail spray, providing support for the state monitoring of the aircraft engine.

Citation Download Citation

Yanling Li, Xin Li, Jun Xu, Zechuan Li, and Jun Wu "The temperature field measurement method by using schlieren method for aircraft engine", Proc. SPIE 11439, 2019 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 114391E (12 March 2020); https://doi.org/10.1117/12.2549985

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KEYWORDS

Temperature metrology

Combustion

Laser induced fluorescence

Refractive index

Absorption spectroscopy

Laser communications

Safety

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