波浪情况下民机水上迫降性能数值分析

doi:10.7527/S1000-6893.2023.28604

Abstract

Abstract:

To study the ditching performance of civil aircraft in wave conditions， the finite volume method of computational fluid dynamics is used to solve the unsteady incompressible RANS equation. Based on the relevant requirements and suggestions of airworthiness regulations， VOF method， whole dynamic grid method， stokes fifth-order wave model and adaptive grid technology are used to construct the numerical simulation model. The research object is airbus A320-200. Firstly， the ditching process of aircraft in the calm water and wave condition is compared and analyzed. The results show that the maximum horizontal overload is 2.42 g in the wave condition， which is 1.09 times of that in the calm condition. The maximum vertical overload is 4.82 g， which is 2.82 times of that in the calm water condition. In both cases， cushion effect and diving phenomenon are obvious. In the initial stage of impact， the aircraft is affected by water suction. In the wave condition， jumping phenomenon appears， but does not have apparent effect on the ditching process. Secondly， the influence of wave factors on water ditching performance is studied. The results show that with the increase of the wave height， the maximum horizontal and vertical overload increase. With the increase of the wave length， the maximum vertical overload decreases. With the increase of the wave height and length， the maximum sinking velocity increases.

Key words: wave, civil aircraft, ditching, numerical wave generation, two phase flow

CLC Number:

V211.3

Meng LI, Xingyi CHEN, Jichang CHEN, Bin WU, Mingbo TONG. Numerical analysis of civil aircraft ditching performance in wave condition[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(2): 28-43.

Figures/Tables 18

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参数	数值
机身长度/m	37.57
机翼展长/m	17.21
平均气动弦长/m	4.25
质心坐标	（0，0，0）
质量/t	52
俯仰转动惯量/（kg·m²）	1.39×10⁶

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Numerical analysis of civil aircraft ditching performance in wave condition

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References 28

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工况序号	波长/m	波高/m	初始前飞速度/（m·s^-1）	初始下沉速度/（m·s^-1）
1	0	0	40	0.91
2	35	1	40	0.91
3	35	0.5	40	0.91
4	35	0.75
5	35	1.25
6	35	1.5
7	25	1	40	0.91
8	30	1
9	40	1
10	45	1