Numerical analysis of influence of stern flaps on motion and stability of high-speed amphibious platform
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摘要:
目的 压浪板对两栖平台的水上性能具有显著影响，需探讨滑行状态下压浪板对高速两栖平台航行姿态及运动稳定性的影响规律。 方法 采用SST k-ω湍流模型以及重叠网格技术，对高速状态下两栖平台的静水直航进行CFD数值仿真计算，比较不同压浪板作用下平台姿态及稳定性的变化特性，并利用支持向量机（SVM）进行速度、重心位置等因素影响下平台运动稳定性边界的分类识别。 结果 结果显示，压浪板通过改变平台底面的压力分布，可减小航行纵倾角，并且压浪板的下旋角度越大，对姿态稳定性的影响越显著；在重心位置相同的情况下，可提高平台稳定状态下能够达到的最大航速。 结论 研究表明减摇附体的应用及运动稳定性的提高对两栖平台的高速化发展意义重大。 Abstract:Objectives Stern flaps have a significant impact on the water performance of high-speed amphibious platforms. This paper discusses the influence of stern flaps on the motion and hydrodynamic characteristics of a high-speed amphibious platform in a sliding state. Method Using the SST k-ω turbulence model and overset grid technology, the CFD numerical simulations of an amphibious platform's high-speed navigation under static water conditions are performed, and the motion response and stability of the platform with different stern flaps are analyzed. Considering the influence of the velocity, center of gravity and angle of the stern flaps on the longitudinal motion of the platform, supporting vector machines are adopted to classify and recognize the boundary of its motion stability. Results The results show that the stern flaps reduce the sailing trim angle by changing the pressure distribution on the underside of the platform, and the larger the rotation angle of the stern flaps, the more significant the influence on motion stability; when the position of the center of gravity is the same, the maximum speed of the platform in a stable state is increased. Conclusion The application of stern flaps and the improvement of motion stability are of great significance for the development of high-speed amphibious platforms. -
图 7 不同压浪板下旋角时平台底部相对压力分布
Figure 7. Relative pressure distribution at the bottom of platform under different α
图 8 不同下旋角度时压浪板及平台纵剖线相对压力比较 （v = 22 kn）
Figure 8. Relative pressure on longitudinal section of platform and stern flap under different α (v = 22 kn)
图 9 不同航速下的姿态收敛情况 (α=15°，r=0.40)
Figure 9. Attitude convergence at different speeds (α=15°, r=0.40)
图 10 不同压浪板状态下姿态收敛情况 (v=22 kn，r = 0.43)
Figure 10. Attitude convergence at different stern flaps (v=22 kn, r = 0.43)
表 1 GPPH滑行艇结构参数
Table 1. Parameters of GPPH planing craft
参数 数值 艇长Ll /m 2.410 艇宽Bl /m 0.630 质量ml /kg 101.250 重心距船艉距离xl /m 0.844 重心距基线高度zl /m 0.138 纵向转动惯量Iyy /(kg·m2) 20.940 静浮吃水Dl /m 0.148 
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表 2 两栖平台参数
Table 2. Parameters of amphibious platform
参数 数值 总长L/m 6.00 水线长LWL/m 5.69 型宽B/m 2.36 吃水D/m 0.42 排水量Δ/t 3.20 重心距底板高度zg /m 0.30 压浪板长度/m 0.15 压浪板宽度/m 0.34
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表 3 网格敏感性结果
Table 3. Results of grid sensitivity
表面网格尺寸/mm α=8° α=23° 纵倾角/(°) 升沉/m 纵倾角/(°) 升沉/m 14 4.36 0.318 1.66 0.254 20 4.23 0.316 1.55 0.256 28 3.89 0.319 1.54 0.256
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表 4 22 kn速度下的纵向运动结果
Table 4. The results of longitudinal motion at a speed of 22 kn
α/(°) 纵倾角/(°) 升沉/m 无压浪板 4.61 0.34 2 4.50 0.33 8 4.23 0.31 15 2.95 0.28 23 1.55 0.26
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