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9 October 2018 Water spray infrared extinction calculation and experimental validation
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Abstract
In recent years, the attenuation characteristics of log-normal water spray in the infrared region of atmospheric window have been studied in depth. However, there is no report on the comparison between calculation of the infrared transmittance of water spray based on Mie scattering using the LNMCM method and experiment, and the calculation error has not been publicly discussed. In this paper, we used Fluent to calculate the droplet concentration of water spray formed by a square arrangement of four FF-12 nozzles. After the water droplet number density distribution was obtained, the LNMCM method was used to calculate the infrared transmittance of water spray formed by the four-mounted FF-12 nozzles. On the other hand, an infrared attenuating test platform was built with four FF-12 nozzles, and an infrared imaging measurement test was conducted on the water spray formed by the four-mounted nozzles and the test panel that was shielded by it. The article compares the calculated results with the experimental results. Error analysis shows that the calculated value of the infrared radiation intensity of 7.5~13μm deviates from the experimental value by 3.1%. This paper verifies the accuracy of LNMCM and Fluent to calculate the infrared transmittance of log-normal distribution water spray through test measurement method, and forms a relatively complete calculation method of infrared radiation and attenuation of water spray.
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Zhongwei Chen, Li Zhang, and Jiazheng Ni "Water spray infrared extinction calculation and experimental validation", Proc. SPIE 10794, Target and Background Signatures IV, 107940X (9 October 2018); https://doi.org/10.1117/12.2323571
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