Simulation and Experimental Validation of Landing Distribution Characteristics of Aircraft Mass Fire Extinguishing Bags Sprayed at High Altitude

doi:10.16183/j.cnki.jsjtu.2023.014

Abstract

Abstract:

In order to optimize the design of high-altitude sprinkling system of fire-fighting aircraft, it is necessary to establish a model reflecting the high-altitude spraying and distribution mechanism of mass fire extinguishing bags during the flight. Based on the discrete element method and the computational fluid dynamics method, a high-altitude spraying and distributing model of aircraft mass fire extinguishing bags is established, and the spraying characteristics and landing area distribution at different flight speeds and altitudes are obtained. The model is verified by experiments. The deviations between simulated landing distribution and experimental data are less than 20.0%. The research results provide a theoretical model for the development of aircraft high altitude fire extinguishing system, so as to significantly improve the fire extinguishing performance of aircraft spraying system.

Key words: fire extinguishing bag, flight, fire-fighting aircraft, landing distribution characteristics

CLC Number:

TP202+.2

WU Yang, LIN Dong, SUN Haoran, WU Chengyun, QU Yuanyuan, LI Xuan, HU Haitao, CHEN Yingchun. Simulation and Experimental Validation of Landing Distribution Characteristics of Aircraft Mass Fire Extinguishing Bags Sprayed at High Altitude[J]. Journal of Shanghai Jiao Tong University, 2024, 58(8): 1264-1270.

Figures/Tables 9

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工况	飞行高度/m	飞行速度/(km·h^-1)	风速/(m·s^-1)	风向/(°)
1	80	100	3.6	160
2	80	120	4.1	147
3	120	120	5.0	200

工况	实验宽度/m	实验长度/m	模拟宽度/m	模拟长度/m	宽度偏差/%	长度偏差/%
1	20.0	120.0	24.0	111.0	20.0	7.5
2	20.0	140.0	23.0	146.0	15.0	4.3
3	30.0	150.0	29.6	157.0	1.3	4.7